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All questions of Solids, Liquids and Gases for Class 5 Exam
The state of matter which has no fixed shape but has definite volume is the- a)Gasous state.
- b)Liquid state.
- c)Solid state.
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The state of matter which has no fixed shape but has definite volume is the
a)
Gasous state.
b)
Liquid state.
c)
Solid state.
d)
None of these
|
Harshad Goyal answered |
Matter in the liquid state has no fixed shape but has definite volume.
Which of the following is not a physical change?
- a)Tearing of Paper
- b)Freezing of ice
- c)Rusting of iron
- d)Breaking of Furniture
Correct answer is option 'C'. Can you explain this answer?
Which of the following is not a physical change?
a)
Tearing of Paper
b)
Freezing of ice
c)
Rusting of iron
d)
Breaking of Furniture
|
Edu Impact answered |
Melting of wax is a physical change as the original substance, wax, can be obtained back by solidifying it.
Which of the following is a chemical change?- a)Melting of butter
- b)Boiling of milk
- c)Souring of milk
- d)Shredding of paper
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a chemical change?
a)
Melting of butter
b)
Boiling of milk
c)
Souring of milk
d)
Shredding of paper
|
Aryan Joshi answered |
Explanation:
Chemical change is a process that involves a chemical reaction, resulting in the formation of new substances with new properties. Let's analyze each option to determine which is a chemical change.
A. Melting of butter: When butter melts, it changes from a solid to a liquid state but the chemical composition of the butter remains the same. Therefore, it is a physical change, not a chemical change.
B. Boiling of milk: When milk is boiled, it changes from a liquid to a gas state. However, the chemical composition of the milk remains the same. Therefore, it is also a physical change, not a chemical change.
C. Souring of milk: When milk sours, it undergoes a chemical reaction, in which the lactose (a sugar) present in milk is converted into lactic acid by the action of bacteria. This changes the chemical composition of milk, making it sour in taste. Therefore, souring of milk is a chemical change.
D. Shredding of paper: When paper is shredded, it is still made up of the same chemical composition as before. Therefore, shredding of paper is also a physical change, not a chemical change.
Conclusion: The correct answer is option C, souring of milk, which is a chemical change because it involves a chemical reaction resulting in the formation of a new substance with new properties.
Chemical change is a process that involves a chemical reaction, resulting in the formation of new substances with new properties. Let's analyze each option to determine which is a chemical change.
A. Melting of butter: When butter melts, it changes from a solid to a liquid state but the chemical composition of the butter remains the same. Therefore, it is a physical change, not a chemical change.
B. Boiling of milk: When milk is boiled, it changes from a liquid to a gas state. However, the chemical composition of the milk remains the same. Therefore, it is also a physical change, not a chemical change.
C. Souring of milk: When milk sours, it undergoes a chemical reaction, in which the lactose (a sugar) present in milk is converted into lactic acid by the action of bacteria. This changes the chemical composition of milk, making it sour in taste. Therefore, souring of milk is a chemical change.
D. Shredding of paper: When paper is shredded, it is still made up of the same chemical composition as before. Therefore, shredding of paper is also a physical change, not a chemical change.
Conclusion: The correct answer is option C, souring of milk, which is a chemical change because it involves a chemical reaction resulting in the formation of a new substance with new properties.
Substance 'P' does not have a fixed volume. It occupies the total space of the container and it can be compressed. What is 'P' likely to be?- a)Solid
- b)Liquid
- c)Gas
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
Substance 'P' does not have a fixed volume. It occupies the total space of the container and it can be compressed. What is 'P' likely to be?
a)
Solid
b)
Liquid
c)
Gas
d)
All of these
|
|
Rounak Patel answered |
Gases have no strong bonds between the atoms. They can be compressed.
What is the term used for liquids that mix with each other?- a)Miscible liquids
- b)Immiscible liquids
- c)Molecules
- d)Atoms
Correct answer is option 'A'. Can you explain this answer?
What is the term used for liquids that mix with each other?
a)
Miscible liquids
b)
Immiscible liquids
c)
Molecules
d)
Atoms
|
|
Tanishq Chavan answered |
The term used for liquids that mix with each other is "miscible liquids".
Explanation:
- When two or more liquids are able to mix and form a homogeneous mixture, they are said to be miscible.
- This means that the molecules of the two liquids are able to mix and spread evenly throughout the mixture.
- The ability of liquids to mix with each other depends on the attractive forces between their molecules.
- If the attractive forces between the molecules of two liquids are similar, then they are likely to be miscible.
- For example, water and ethanol are both polar molecules and have similar attractive forces, so they are miscible and can mix with each other in any proportion.
- On the other hand, oil and water are immiscible liquids because oil is non-polar and water is polar. The attractive forces between their molecules are not strong enough to allow them to mix.
- When two immiscible liquids are mixed together, they form separate layers, with one liquid floating on top of the other.
- It is important to note that the term miscible is used specifically for liquids, while the term soluble is used for solids that mix with each other in a liquid solvent.
- For example, sugar is soluble in water because the sugar molecules can mix with the water molecules and form a homogeneous mixture.
In summary, the term "miscible liquids" refers to liquids that are able to mix and form a homogeneous mixture due to similar attractive forces between their molecules.
Explanation:
- When two or more liquids are able to mix and form a homogeneous mixture, they are said to be miscible.
- This means that the molecules of the two liquids are able to mix and spread evenly throughout the mixture.
- The ability of liquids to mix with each other depends on the attractive forces between their molecules.
- If the attractive forces between the molecules of two liquids are similar, then they are likely to be miscible.
- For example, water and ethanol are both polar molecules and have similar attractive forces, so they are miscible and can mix with each other in any proportion.
- On the other hand, oil and water are immiscible liquids because oil is non-polar and water is polar. The attractive forces between their molecules are not strong enough to allow them to mix.
- When two immiscible liquids are mixed together, they form separate layers, with one liquid floating on top of the other.
- It is important to note that the term miscible is used specifically for liquids, while the term soluble is used for solids that mix with each other in a liquid solvent.
- For example, sugar is soluble in water because the sugar molecules can mix with the water molecules and form a homogeneous mixture.
In summary, the term "miscible liquids" refers to liquids that are able to mix and form a homogeneous mixture due to similar attractive forces between their molecules.
What happens to the intermolecular space between molecules when a substance is cooled?- a)It decreases
- b)It increases
- c)It remains constant
- d)It becomes zero
Correct answer is option 'A'. Can you explain this answer?
What happens to the intermolecular space between molecules when a substance is cooled?
a)
It decreases
b)
It increases
c)
It remains constant
d)
It becomes zero
|
Asha Sengupta answered |
The intermolecular space between molecules refers to the distance between the particles that make up a substance. When a substance is cooled, the kinetic energy of its particles decreases. This reduction in kinetic energy leads to changes in the intermolecular space. Let's explore this in more detail:
1. Explanation of intermolecular space:
- Intermolecular space refers to the space between molecules or particles in a substance.
- It is a result of the attractive forces between the particles, such as van der Waals forces, dipole-dipole interactions, or hydrogen bonding.
- The intermolecular space determines the physical properties of a substance, such as density, boiling point, and compressibility.
2. Effect of cooling on intermolecular space:
- Cooling a substance reduces the kinetic energy of its particles.
- As the particles lose kinetic energy, they slow down and move closer together.
- The attractive forces between the particles become more dominant as they approach each other.
- Consequently, the intermolecular space between molecules decreases.
3. Explanation of the correct option:
- The correct answer, option 'A' (It decreases), is supported by the explanation above.
- Cooling a substance reduces the intermolecular space because the particles move closer together due to decreased kinetic energy.
- This reduction in intermolecular space is observed in various substances when cooled, including gases, liquids, and solids.
4. Examples:
- In the case of a gas, cooling it can cause the particles to condense into a liquid or solid phase. This phase change is accompanied by a decrease in intermolecular space.
- For a liquid, cooling can lead to the formation of a solid as the particles arrange themselves in a more ordered manner, resulting in a decrease in intermolecular space.
- In a solid, cooling can cause the particles to vibrate less, leading to a decrease in intermolecular space between the fixed positions of the particles.
In summary, when a substance is cooled, the intermolecular space between molecules decreases. This is due to the reduction in kinetic energy of the particles, which causes them to move closer together and strengthen the attractive forces between them.
1. Explanation of intermolecular space:
- Intermolecular space refers to the space between molecules or particles in a substance.
- It is a result of the attractive forces between the particles, such as van der Waals forces, dipole-dipole interactions, or hydrogen bonding.
- The intermolecular space determines the physical properties of a substance, such as density, boiling point, and compressibility.
2. Effect of cooling on intermolecular space:
- Cooling a substance reduces the kinetic energy of its particles.
- As the particles lose kinetic energy, they slow down and move closer together.
- The attractive forces between the particles become more dominant as they approach each other.
- Consequently, the intermolecular space between molecules decreases.
3. Explanation of the correct option:
- The correct answer, option 'A' (It decreases), is supported by the explanation above.
- Cooling a substance reduces the intermolecular space because the particles move closer together due to decreased kinetic energy.
- This reduction in intermolecular space is observed in various substances when cooled, including gases, liquids, and solids.
4. Examples:
- In the case of a gas, cooling it can cause the particles to condense into a liquid or solid phase. This phase change is accompanied by a decrease in intermolecular space.
- For a liquid, cooling can lead to the formation of a solid as the particles arrange themselves in a more ordered manner, resulting in a decrease in intermolecular space.
- In a solid, cooling can cause the particles to vibrate less, leading to a decrease in intermolecular space between the fixed positions of the particles.
In summary, when a substance is cooled, the intermolecular space between molecules decreases. This is due to the reduction in kinetic energy of the particles, which causes them to move closer together and strengthen the attractive forces between them.
The force of attraction between molecules is the strongest in- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
The force of attraction between molecules is the strongest in
a)
b)
c)
d)
|
|
Harshad Goyal answered |
Figure A shows the strongest forces of attraction between the molecules of a solid.
Which of the following is a physical change?- a)Rusting of iron
- b)Baking a cake
- c)Freezing of water
- d)Rotting of vegetables
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a physical change?
a)
Rusting of iron
b)
Baking a cake
c)
Freezing of water
d)
Rotting of vegetables
|
Priyanka Sharma answered |
Freezing of water is a physical change as it only changes the state of water from liquid to solid and can be reversed by melting
Which of the following is NOT a state of matter?- a)Gas
- b)Liquid
- c)Solid
- d)Energy
Correct answer is option 'D'. Can you explain this answer?
Which of the following is NOT a state of matter?
a)
Gas
b)
Liquid
c)
Solid
d)
Energy
|
Anand thakur answered |
States of Matter
Matter is anything that has mass and takes up space. There are four states of matter - solids, liquids, gases, and plasma.
Solids
Solids have a definite shape and volume. The particles in a solid are tightly packed together and vibrate in place.
Liquids
Liquids have a definite volume but take the shape of their container. The particles in a liquid are close together but move around freely.
Gases
Gases have neither a definite shape nor volume. The particles in a gas are far apart and move around quickly.
Plasma
Plasma is a state of matter found in stars and lightning bolts. It is similar to a gas, but the particles are charged and can conduct electricity.
Answer
The correct answer is option 'D' - Energy. Energy is not a state of matter, but it is associated with matter and can cause changes in its state.
Matter is anything that has mass and takes up space. There are four states of matter - solids, liquids, gases, and plasma.
Solids
Solids have a definite shape and volume. The particles in a solid are tightly packed together and vibrate in place.
Liquids
Liquids have a definite volume but take the shape of their container. The particles in a liquid are close together but move around freely.
Gases
Gases have neither a definite shape nor volume. The particles in a gas are far apart and move around quickly.
Plasma
Plasma is a state of matter found in stars and lightning bolts. It is similar to a gas, but the particles are charged and can conduct electricity.
Answer
The correct answer is option 'D' - Energy. Energy is not a state of matter, but it is associated with matter and can cause changes in its state.
Which process involves changing a liquid into a gas on heating?- a)Melting
- b)Condensation
- c)Freezing
- d)Evaporation
Correct answer is option 'D'. Can you explain this answer?
Which process involves changing a liquid into a gas on heating?
a)
Melting
b)
Condensation
c)
Freezing
d)
Evaporation
|
|
Aditya Shah answered |
Evaporation is the process of changing a liquid into a gas on heating.
Which of the following can dissolve in water?- a)Atoms
- b)Energy
- c)Molecules
- d)Elements
Correct answer is option 'C'. Can you explain this answer?
Which of the following can dissolve in water?
a)
Atoms
b)
Energy
c)
Molecules
d)
Elements
|
|
Jay Rane answered |
Dissolving in Water
When a substance dissolves in water, it means that it breaks down into smaller particles and mixes evenly with water molecules. Some substances can dissolve in water while others cannot. Let's take a look at the options given in the question and see which one can dissolve in water.
Atoms
Atoms are the smallest unit of matter that cannot be broken down any further. They are the building blocks of all matter. However, atoms cannot dissolve in water as they are too small and do not have a charge.
Energy
Energy is not a substance but a property of matter. It cannot dissolve in water as it is not a physical object.
Molecules
Molecules are made up of two or more atoms that are chemically bonded together. Some molecules can dissolve in water while others cannot. The ability of a molecule to dissolve in water depends on its polarity. Polar molecules have a positive and negative end and can dissolve in water, while non-polar molecules cannot. Examples of polar molecules that can dissolve in water include sugar and salt.
Elements
Elements are substances made up of only one type of atom. Like atoms, they cannot dissolve in water as they are too small and do not have a charge.
Conclusion
Out of the given options, only molecules can dissolve in water. However, it is important to note that not all molecules can dissolve in water. The ability of a molecule to dissolve in water depends on its polarity.
When a substance dissolves in water, it means that it breaks down into smaller particles and mixes evenly with water molecules. Some substances can dissolve in water while others cannot. Let's take a look at the options given in the question and see which one can dissolve in water.
Atoms
Atoms are the smallest unit of matter that cannot be broken down any further. They are the building blocks of all matter. However, atoms cannot dissolve in water as they are too small and do not have a charge.
Energy
Energy is not a substance but a property of matter. It cannot dissolve in water as it is not a physical object.
Molecules
Molecules are made up of two or more atoms that are chemically bonded together. Some molecules can dissolve in water while others cannot. The ability of a molecule to dissolve in water depends on its polarity. Polar molecules have a positive and negative end and can dissolve in water, while non-polar molecules cannot. Examples of polar molecules that can dissolve in water include sugar and salt.
Elements
Elements are substances made up of only one type of atom. Like atoms, they cannot dissolve in water as they are too small and do not have a charge.
Conclusion
Out of the given options, only molecules can dissolve in water. However, it is important to note that not all molecules can dissolve in water. The ability of a molecule to dissolve in water depends on its polarity.
Matter can be defined as something that- a)Occupies space
- b)Has mass
- c)Exists in three states
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Matter can be defined as something that
a)
Occupies space
b)
Has mass
c)
Exists in three states
d)
All of the above
|
|
Asha Sengupta answered |
Matter is defined as something that which occupies space and possesses rest mass, especially as distinct from energy and exists in all the three states.
Which of the following is a physical change?
- a)Rusting of iron
- b)Cooking of food
- c)Burning of paper
- d)Converting ice into water
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a physical change?
a)
Rusting of iron
b)
Cooking of food
c)
Burning of paper
d)
Converting ice into water
|
|
Chirag Datta answered |
Converting ice to water: There is no change in the chemical composition of water. The process is reversible and ice can be obtained back by freezing. Thus it is clear that it is a physical change.
Matter is made up tiny particles called- a)Atoms.
- b)Molecules.
- c)Cells.
- d)Ions.
Correct answer is option 'A'. Can you explain this answer?
Matter is made up tiny particles called
a)
Atoms.
b)
Molecules.
c)
Cells.
d)
Ions.
|
|
Rounak Patel answered |
Matter is made up of tiny particles called atoms.
What happens to electric wires between electric poles in the summer season?- a)They become loose
- b)They become tight
- c)They remain the same
- d)They break
Correct answer is option 'A'. Can you explain this answer?
What happens to electric wires between electric poles in the summer season?
a)
They become loose
b)
They become tight
c)
They remain the same
d)
They break
|
Maulik Chauhan answered |
Explanation:
In the summer season, electric wires between electric poles can become loose. This can happen due to a few reasons:
1. Expansion and contraction of materials:
- In the summer season, temperatures can rise significantly, causing materials, including metal wires, to expand.
- When the wires expand, they may become longer and may not fit as tightly between the electric poles as they did during cooler seasons.
- This expansion can create slack in the wires, making them loose.
2. Thermal expansion of the poles:
- Electric poles are often made of materials such as wood or metal.
- These materials also expand when exposed to high temperatures.
- As the poles expand, they may move slightly, causing the wires connected to them to become loose.
3. Natural factors:
- Wind and storms are common during the summer season.
- Strong winds can cause the wires to sway and move, leading to them becoming loose.
- Additionally, lightning strikes during storms can cause damage to the wires, resulting in them becoming loose or even breaking.
Consequences of loose electric wires:
1. Safety hazards:
- Loose electric wires pose a significant safety risk.
- They can sag and come into contact with trees, buildings, or the ground, increasing the chances of electrical accidents.
- People or animals may accidentally touch the live wires, leading to electric shocks or even electrocution.
2. Disruption of electricity supply:
- Loose wires can cause disruptions in the electricity supply.
- If the wires become too loose, they may detach from the electric poles, leading to power outages in the affected area.
Preventive measures:
To prevent electric wires from becoming loose during the summer season, regular maintenance and inspections are necessary. This includes:
- Tightening the wires and ensuring they are securely fastened to the electric poles.
- Checking for any signs of wear or damage and repairing or replacing the wires as needed.
- Trimming tree branches near the wires to prevent them from coming into contact during windy conditions.
- Regularly inspecting the poles for any signs of damage or instability.
By taking these preventive measures and addressing any issues promptly, the risks associated with loose electric wires can be minimized, ensuring a safe and reliable supply of electricity.
In the summer season, electric wires between electric poles can become loose. This can happen due to a few reasons:
1. Expansion and contraction of materials:
- In the summer season, temperatures can rise significantly, causing materials, including metal wires, to expand.
- When the wires expand, they may become longer and may not fit as tightly between the electric poles as they did during cooler seasons.
- This expansion can create slack in the wires, making them loose.
2. Thermal expansion of the poles:
- Electric poles are often made of materials such as wood or metal.
- These materials also expand when exposed to high temperatures.
- As the poles expand, they may move slightly, causing the wires connected to them to become loose.
3. Natural factors:
- Wind and storms are common during the summer season.
- Strong winds can cause the wires to sway and move, leading to them becoming loose.
- Additionally, lightning strikes during storms can cause damage to the wires, resulting in them becoming loose or even breaking.
Consequences of loose electric wires:
1. Safety hazards:
- Loose electric wires pose a significant safety risk.
- They can sag and come into contact with trees, buildings, or the ground, increasing the chances of electrical accidents.
- People or animals may accidentally touch the live wires, leading to electric shocks or even electrocution.
2. Disruption of electricity supply:
- Loose wires can cause disruptions in the electricity supply.
- If the wires become too loose, they may detach from the electric poles, leading to power outages in the affected area.
Preventive measures:
To prevent electric wires from becoming loose during the summer season, regular maintenance and inspections are necessary. This includes:
- Tightening the wires and ensuring they are securely fastened to the electric poles.
- Checking for any signs of wear or damage and repairing or replacing the wires as needed.
- Trimming tree branches near the wires to prevent them from coming into contact during windy conditions.
- Regularly inspecting the poles for any signs of damage or instability.
By taking these preventive measures and addressing any issues promptly, the risks associated with loose electric wires can be minimized, ensuring a safe and reliable supply of electricity.
Which of the following is a chemical change?- a)Melting of ice
- b)Boiling of water
- c)Burning of wood
- d)Chopping of vegetables
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a chemical change?
a)
Melting of ice
b)
Boiling of water
c)
Burning of wood
d)
Chopping of vegetables
|
Kavya Chauhan answered |
Melting of ice:
When ice melts, it undergoes a physical change, not a chemical change. The molecules in the ice are rearranged, but the chemical composition remains the same. The process of melting ice is a phase change from a solid to a liquid state.
Boiling of water:
Similar to the melting of ice, boiling water is also a physical change. The heat energy causes the water molecules to gain enough kinetic energy to break the intermolecular forces and convert from a liquid to a gas state. The chemical composition of water remains unchanged during this process.
Burning of wood:
The burning of wood is a chemical change. When wood burns, it undergoes a process called combustion. The heat energy breaks down the complex organic compounds present in wood, such as cellulose and lignin, into simpler substances like carbon dioxide, water vapor, and ash. This chemical reaction involves the rearrangement of atoms and the formation of new chemical bonds, resulting in a change in the chemical composition of the wood.
Chopping of vegetables:
Chopping vegetables is a physical change. It involves cutting the vegetables into smaller pieces, but the chemical composition of the vegetables remains the same. The process of chopping does not involve any chemical reactions.
Conclusion:
Among the given options, the burning of wood (Option C) is the only example of a chemical change. It involves a combustion reaction that results in the formation of new substances with different chemical properties. The other options, melting of ice, boiling of water, and chopping of vegetables, are all examples of physical changes where the chemical composition remains unchanged.
When ice melts, it undergoes a physical change, not a chemical change. The molecules in the ice are rearranged, but the chemical composition remains the same. The process of melting ice is a phase change from a solid to a liquid state.
Boiling of water:
Similar to the melting of ice, boiling water is also a physical change. The heat energy causes the water molecules to gain enough kinetic energy to break the intermolecular forces and convert from a liquid to a gas state. The chemical composition of water remains unchanged during this process.
Burning of wood:
The burning of wood is a chemical change. When wood burns, it undergoes a process called combustion. The heat energy breaks down the complex organic compounds present in wood, such as cellulose and lignin, into simpler substances like carbon dioxide, water vapor, and ash. This chemical reaction involves the rearrangement of atoms and the formation of new chemical bonds, resulting in a change in the chemical composition of the wood.
Chopping of vegetables:
Chopping vegetables is a physical change. It involves cutting the vegetables into smaller pieces, but the chemical composition of the vegetables remains the same. The process of chopping does not involve any chemical reactions.
Conclusion:
Among the given options, the burning of wood (Option C) is the only example of a chemical change. It involves a combustion reaction that results in the formation of new substances with different chemical properties. The other options, melting of ice, boiling of water, and chopping of vegetables, are all examples of physical changes where the chemical composition remains unchanged.
What is the process called when a liquid turns into a solid?
- a)Freezing
- b)Melting
- c)Boiling
- d)Evaporation
Correct answer is option 'A'. Can you explain this answer?
What is the process called when a liquid turns into a solid?
a)
Freezing
b)
Melting
c)
Boiling
d)
Evaporation
|
|
Soumya Patel answered |
The force of attraction between molecules in solids is strong. This is due to the arrangement and bonding of the atoms within the solid structure.
1. Intermolecular Forces:
In solids, the intermolecular forces are the forces of attraction between molecules. These forces can be categorized into three main types: London dispersion forces, dipole-dipole forces, and hydrogen bonding. These forces act between the molecules and hold them together.
2. London Dispersion Forces:
London dispersion forces are the weakest type of intermolecular force. They occur due to temporary fluctuations in electron distribution, which create temporary dipoles in the molecules. These temporary dipoles induce similar dipoles in neighboring molecules, resulting in attractive forces between them. While London dispersion forces are relatively weak, they still contribute to the overall force of attraction between molecules in solids.
3. Dipole-Dipole Forces:
Dipole-dipole forces occur between polar molecules. These forces arise due to the attraction between the positive end of one molecule and the negative end of another molecule. The strength of dipole-dipole forces depends on the magnitude of the molecular dipole moment. In solids composed of polar molecules, the dipole-dipole forces contribute to the strong force of attraction between the molecules.
4. Hydrogen Bonding:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between a hydrogen atom bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom in a different molecule. Hydrogen bonding is stronger than regular dipole-dipole forces and contributes significantly to the force of attraction between molecules in solids, especially in substances like water and ammonia.
5. Overall Strong Force of Attraction:
In solids, the combination of London dispersion forces, dipole-dipole forces, and hydrogen bonding results in a strong force of attraction between molecules. This strong force is responsible for the rigidity and stability of solid materials.
In conclusion, the force of attraction between molecules in solids is strong. The intermolecular forces, including London dispersion forces, dipole-dipole forces, and hydrogen bonding, contribute to this strong force of attraction.
1. Intermolecular Forces:
In solids, the intermolecular forces are the forces of attraction between molecules. These forces can be categorized into three main types: London dispersion forces, dipole-dipole forces, and hydrogen bonding. These forces act between the molecules and hold them together.
2. London Dispersion Forces:
London dispersion forces are the weakest type of intermolecular force. They occur due to temporary fluctuations in electron distribution, which create temporary dipoles in the molecules. These temporary dipoles induce similar dipoles in neighboring molecules, resulting in attractive forces between them. While London dispersion forces are relatively weak, they still contribute to the overall force of attraction between molecules in solids.
3. Dipole-Dipole Forces:
Dipole-dipole forces occur between polar molecules. These forces arise due to the attraction between the positive end of one molecule and the negative end of another molecule. The strength of dipole-dipole forces depends on the magnitude of the molecular dipole moment. In solids composed of polar molecules, the dipole-dipole forces contribute to the strong force of attraction between the molecules.
4. Hydrogen Bonding:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between a hydrogen atom bonded to a highly electronegative atom (such as oxygen, nitrogen, or fluorine) and another electronegative atom in a different molecule. Hydrogen bonding is stronger than regular dipole-dipole forces and contributes significantly to the force of attraction between molecules in solids, especially in substances like water and ammonia.
5. Overall Strong Force of Attraction:
In solids, the combination of London dispersion forces, dipole-dipole forces, and hydrogen bonding results in a strong force of attraction between molecules. This strong force is responsible for the rigidity and stability of solid materials.
In conclusion, the force of attraction between molecules in solids is strong. The intermolecular forces, including London dispersion forces, dipole-dipole forces, and hydrogen bonding, contribute to this strong force of attraction.
What allows gases to expand and fill any available space?- a)They have very little or almost no space to move between them.
- b)They have space to move freely.
- c)They are packed very loosely with lots of space to move freely.
- d)They attract each other with great force.
Correct answer is option 'C'. Can you explain this answer?
What allows gases to expand and fill any available space?
a)
They have very little or almost no space to move between them.
b)
They have space to move freely.
c)
They are packed very loosely with lots of space to move freely.
d)
They attract each other with great force.
|
Flembe Academy answered |
- Gases can expand and fill any space because they are packed very loosely, giving them lots of space to move freely.
- This means that gases can spread out to fit wherever they are put without any difficulty.
- So, when you see a balloon getting bigger and bigger, it's because the gas inside it is spreading out to take up all the space it can find.
Which of the following has a definite shape and volume?- a)Gas
- b)Liquid
- c)Solid
- d)Plasma
Correct answer is option 'C'. Can you explain this answer?
Which of the following has a definite shape and volume?
a)
Gas
b)
Liquid
c)
Solid
d)
Plasma
|
|
Edu Impact answered |
Solids have a definite shape and volume. Hence, option C is the right option.
Which of the following can be compressed?P: steam
Q: oxygen
R: carbon dioxide- a)Only P and Q
- b)Only P and R
- c)Only Q and R
- d)P, Q and R
Correct answer is option 'D'. Can you explain this answer?
Which of the following can be compressed?
P: steam
Q: oxygen
R: carbon dioxide
Q: oxygen
R: carbon dioxide
a)
Only P and Q
b)
Only P and R
c)
Only Q and R
d)
P, Q and R
|
|
Aniket Chaudhary answered |
Answer:
Introduction:
Compression refers to the process of reducing the volume or size of a substance or material. It is commonly used to reduce the space required for storage or transportation of various substances. In this question, we need to determine which of the given substances can be compressed.
Explanation:
To determine the compressibility of each substance, we need to consider their physical properties and behavior under different conditions. Let's analyze each substance individually:
P: Steam
Steam is the gaseous form of water, which is created when water is heated to its boiling point. Unlike liquids or solids, gases have particles that are widely spaced and move freely. Due to the high kinetic energy of gas particles, they can be easily compressed. Therefore, steam can be compressed.
Q: Oxygen
Oxygen is a gas that is present in the Earth's atmosphere. Similar to steam, oxygen gas consists of particles that are widely spaced and have high kinetic energy. Hence, oxygen can also be compressed.
R: Carbon Dioxide
Carbon dioxide is another gas that is naturally present in the atmosphere. Like other gases, carbon dioxide molecules are also widely spaced and possess high kinetic energy. Therefore, carbon dioxide can be compressed as well.
Conclusion:
Based on the analysis above, we can conclude that all three substances, namely steam (P), oxygen (Q), and carbon dioxide (R), can be compressed. Therefore, the correct answer is option 'D' - P, Q, and R.
Introduction:
Compression refers to the process of reducing the volume or size of a substance or material. It is commonly used to reduce the space required for storage or transportation of various substances. In this question, we need to determine which of the given substances can be compressed.
Explanation:
To determine the compressibility of each substance, we need to consider their physical properties and behavior under different conditions. Let's analyze each substance individually:
P: Steam
Steam is the gaseous form of water, which is created when water is heated to its boiling point. Unlike liquids or solids, gases have particles that are widely spaced and move freely. Due to the high kinetic energy of gas particles, they can be easily compressed. Therefore, steam can be compressed.
Q: Oxygen
Oxygen is a gas that is present in the Earth's atmosphere. Similar to steam, oxygen gas consists of particles that are widely spaced and have high kinetic energy. Hence, oxygen can also be compressed.
R: Carbon Dioxide
Carbon dioxide is another gas that is naturally present in the atmosphere. Like other gases, carbon dioxide molecules are also widely spaced and possess high kinetic energy. Therefore, carbon dioxide can be compressed as well.
Conclusion:
Based on the analysis above, we can conclude that all three substances, namely steam (P), oxygen (Q), and carbon dioxide (R), can be compressed. Therefore, the correct answer is option 'D' - P, Q, and R.
The forces of attraction between the molecules is the strongest in- a)Liquids
- b)Solids
- c)Gaseous
- d)All the three
Correct answer is option 'B'. Can you explain this answer?
The forces of attraction between the molecules is the strongest in
a)
Liquids
b)
Solids
c)
Gaseous
d)
All the three
|
Devika Basak answered |
In solids the force of attraction between molecules is the strongest.
Which of the following changes is possible with the addition of heat?- a)Water vapor changes to liquid water
- b)Water vapor changes to ice
- c)Ice changes to liquid water
- d)Liquid water changes to ice
Correct answer is option 'C'. Can you explain this answer?
Which of the following changes is possible with the addition of heat?
a)
Water vapor changes to liquid water
b)
Water vapor changes to ice
c)
Ice changes to liquid water
d)
Liquid water changes to ice
|
|
Prasad Kulkarni answered |
Ice changes to liquid by the absorption of heat.
What happens to the intermolecular space between molecules when a substance is heated?- a)It decreases
- b)It increases
- c)It remains constant
- d)It becomes zero
Correct answer is option 'B'. Can you explain this answer?
What happens to the intermolecular space between molecules when a substance is heated?
a)
It decreases
b)
It increases
c)
It remains constant
d)
It becomes zero
|
|
Aaditya Chavan answered |
Understanding Intermolecular Space
When a substance is heated, the energy of its molecules increases. This process affects the intermolecular space in several ways:
Effect of Heating on Molecules
- When a substance is heated, the molecules gain kinetic energy.
- Increased kinetic energy causes molecules to move faster and vibrate more intensely.
Intermolecular Forces
- Molecules are held together by intermolecular forces, which are attractions between them.
- Heating weakens these intermolecular forces, allowing molecules to move apart.
Increase in Intermolecular Space
- As the molecules move faster and further apart, the intermolecular space increases.
- This is particularly noticeable in solids turning into liquids (melting) and liquids turning into gases (vaporization).
Conclusion
- Therefore, when a substance is heated, the intermolecular space between its molecules increases.
- This is why option 'B' is correct: heating causes an increase in the distance between molecules.
Understanding these concepts helps us grasp the behavior of substances in different states and how temperature influences them.
When a substance is heated, the energy of its molecules increases. This process affects the intermolecular space in several ways:
Effect of Heating on Molecules
- When a substance is heated, the molecules gain kinetic energy.
- Increased kinetic energy causes molecules to move faster and vibrate more intensely.
Intermolecular Forces
- Molecules are held together by intermolecular forces, which are attractions between them.
- Heating weakens these intermolecular forces, allowing molecules to move apart.
Increase in Intermolecular Space
- As the molecules move faster and further apart, the intermolecular space increases.
- This is particularly noticeable in solids turning into liquids (melting) and liquids turning into gases (vaporization).
Conclusion
- Therefore, when a substance is heated, the intermolecular space between its molecules increases.
- This is why option 'B' is correct: heating causes an increase in the distance between molecules.
Understanding these concepts helps us grasp the behavior of substances in different states and how temperature influences them.
The intermolecular space between molecules is maximum in a- a)solid
- b)Liquid
- c)Gas
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
The intermolecular space between molecules is maximum in a
a)
solid
b)
Liquid
c)
Gas
d)
All of these
|
|
Rutuja Bose answered |
In a gas, the molecules are far away from each other.
Which process involves changing a solid into a liquid on heating?- a)Evaporation
- b)Melting
- c)Condensation
- d)Freezing
Correct answer is option 'B'. Can you explain this answer?
Which process involves changing a solid into a liquid on heating?
a)
Evaporation
b)
Melting
c)
Condensation
d)
Freezing
|
|
Anuj Kulkarni answered |
Melting: Changing a Solid into a Liquid on Heating
Melting is the process of changing a solid into a liquid by heating it. It occurs when a solid substance absorbs heat energy and the particles in the solid start to vibrate faster and faster. They eventually absorb enough energy to overcome the forces that hold them together, and the solid turns into a liquid.
Examples of Melting
Melting is a common process that occurs in our everyday lives. Here are some examples of melting:
- Ice melting into water when it is left out of the freezer
- Chocolate melting in your mouth or on a warm surface
- Wax melting when it is heated up in a candle
Melting Point
Every substance has a specific temperature at which it melts, which is known as its melting point. The melting point of a substance is the temperature at which it changes from a solid to a liquid. Different substances have different melting points, depending on their chemical structure and properties.
Uses of Melting
Melting has many practical uses in our daily lives. Here are some examples:
- Melting is used to make candles and wax products
- Melting is used in the production of metals and alloys
- Melting is used in cooking and baking, such as melting butter or chocolate
Conclusion
Melting is the process of changing a solid into a liquid by heating it. It occurs when a solid absorbs heat energy and the particles in the solid start to vibrate faster and faster. Melting has many practical uses in our daily lives and is a common process that occurs in nature and in industry.
Melting is the process of changing a solid into a liquid by heating it. It occurs when a solid substance absorbs heat energy and the particles in the solid start to vibrate faster and faster. They eventually absorb enough energy to overcome the forces that hold them together, and the solid turns into a liquid.
Examples of Melting
Melting is a common process that occurs in our everyday lives. Here are some examples of melting:
- Ice melting into water when it is left out of the freezer
- Chocolate melting in your mouth or on a warm surface
- Wax melting when it is heated up in a candle
Melting Point
Every substance has a specific temperature at which it melts, which is known as its melting point. The melting point of a substance is the temperature at which it changes from a solid to a liquid. Different substances have different melting points, depending on their chemical structure and properties.
Uses of Melting
Melting has many practical uses in our daily lives. Here are some examples:
- Melting is used to make candles and wax products
- Melting is used in the production of metals and alloys
- Melting is used in cooking and baking, such as melting butter or chocolate
Conclusion
Melting is the process of changing a solid into a liquid by heating it. It occurs when a solid absorbs heat energy and the particles in the solid start to vibrate faster and faster. Melting has many practical uses in our daily lives and is a common process that occurs in nature and in industry.
Which of the following determines the state of matter?- a)Size
- b)Shape
- c)Arrangement of molecules
- d)Structure
Correct answer is option 'C'. Can you explain this answer?
Which of the following determines the state of matter?
a)
Size
b)
Shape
c)
Arrangement of molecules
d)
Structure
|
|
Muskaan Chavan answered |
The state in which matter exists depends on how the molecules in it are packed.
State whether the following statement is True or FalseWhen you open a bottle of a fizzy drink like cola, the bubbles that come out are water vapor bubbles.- a)True
- b)False
Correct answer is option 'B'. Can you explain this answer?
State whether the following statement is True or False
When you open a bottle of a fizzy drink like cola, the bubbles that come out are water vapor bubbles.
a)
True
b)
False
|
|
Flembe Academy answered |
- When you open a bottle of a fizzy drink like cola, the bubbles that come out are not water vapor bubbles. They are bubbles of carbon dioxide gas. So, the correct answer is False.
- Fun Fact: Fizzy drinks are a solution of the gas carbon dioxide in water, which gives them their bubbly nature!
Solvents are mostly- a)Solids
- b)Liquids
- c)Gases
- d)All the three
Correct answer is option 'B'. Can you explain this answer?
Solvents are mostly
a)
Solids
b)
Liquids
c)
Gases
d)
All the three
|
|
Devika Basak answered |
Solvents are mostly liquids.
Oxygen, nitrogen and hydrogen may be grouped together, because at room temperature they are all- a)Suspensions
- b)Gases
- c)Colloids
- d)Solids
Correct answer is option 'B'. Can you explain this answer?
Oxygen, nitrogen and hydrogen may be grouped together, because at room temperature they are all
a)
Suspensions
b)
Gases
c)
Colloids
d)
Solids
|
Saranya Chakraborty answered |
Oxygen, nitrogen and hydrogen are all gases.
Which of the following is a chemical change?- a)Melting of wax
- b)Burning of matchsticks
- c)Cutting of vegetables
- d)Shredding of clothes
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a chemical change?
a)
Melting of wax
b)
Burning of matchsticks
c)
Cutting of vegetables
d)
Shredding of clothes
|
|
Shilpa Choudhury answered |
Burning of matchsticks is a chemical change as it results in the formation of new substances like ash and gases, and cannot be reversed.
The material that dissolves in a liquid is a- a)Solute
- b)Solvent
- c)Residue
- d)Solution
Correct answer is option 'A'. Can you explain this answer?
The material that dissolves in a liquid is a
a)
Solute
b)
Solvent
c)
Residue
d)
Solution
|
Sagarika Kulkarni answered |
Understanding Solute, Solvent, and Solution
When discussing solutions, it’s important to understand the roles of different components involved.
What is a Solute?
- The solute is the material that dissolves in a liquid.
- It is usually present in a smaller amount compared to the solvent.
- Common examples include sugar or salt in water.
What is a Solvent?
- The solvent is the liquid in which the solute dissolves.
- It is typically present in a larger amount.
- Water is known as the universal solvent because it can dissolve many substances.
What is a Solution?
- A solution is a homogeneous mixture formed when a solute dissolves in a solvent.
- It has a uniform composition, meaning the solute is evenly distributed throughout the solvent.
What is Residue?
- Residue refers to the solid material left behind after a solution has been formed.
- It usually occurs when a solute does not fully dissolve or when a separation process is involved.
Key Takeaway
- In summary, the correct answer to the question is option 'A', as the solute is the substance that dissolves in the solvent to form a solution. Understanding these terms can help in grasping the basics of chemistry and how different substances interact with each other.
When discussing solutions, it’s important to understand the roles of different components involved.
What is a Solute?
- The solute is the material that dissolves in a liquid.
- It is usually present in a smaller amount compared to the solvent.
- Common examples include sugar or salt in water.
What is a Solvent?
- The solvent is the liquid in which the solute dissolves.
- It is typically present in a larger amount.
- Water is known as the universal solvent because it can dissolve many substances.
What is a Solution?
- A solution is a homogeneous mixture formed when a solute dissolves in a solvent.
- It has a uniform composition, meaning the solute is evenly distributed throughout the solvent.
What is Residue?
- Residue refers to the solid material left behind after a solution has been formed.
- It usually occurs when a solute does not fully dissolve or when a separation process is involved.
Key Takeaway
- In summary, the correct answer to the question is option 'A', as the solute is the substance that dissolves in the solvent to form a solution. Understanding these terms can help in grasping the basics of chemistry and how different substances interact with each other.
Which of these is/are present in sugar molecules?- a)Oxygen
- b)Hydrogen
- c)Carbon
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
Which of these is/are present in sugar molecules?
a)
Oxygen
b)
Hydrogen
c)
Carbon
d)
All of these
|
|
Devika Basak answered |
A sugar molecule contains several atoms of hydrogen, oxygen and carbon.
When a solid changes into a liquid, the process is called- a)Freezing
- b)Vaporization
- c)Melting
- d)Condensation
Correct answer is option 'C'. Can you explain this answer?
When a solid changes into a liquid, the process is called
a)
Freezing
b)
Vaporization
c)
Melting
d)
Condensation
|
|
Sanskriti Sen answered |
During melting solids change to liquids by the-absorption of heat.
Which process involves changing a solid into liquid when heating?
- a)Freezing
- b)Melting
- c)Condensation
- d)Evaporation
Correct answer is option 'A'. Can you explain this answer?
Which process involves changing a solid into liquid when heating?
a)
Freezing
b)
Melting
c)
Condensation
d)
Evaporation
|
Ameya Shah answered |
Freezing is the process of changing a liquid into a solid by cooling it. When a substance is cooled, its particles slow down and come closer together, resulting in a more ordered arrangement. This causes the substance to transition from a liquid state to a solid state.
Let's break down the process of freezing and understand it in detail:
Definition of Freezing:
Freezing is a phase transition where a substance changes from a liquid state to a solid state due to a decrease in temperature.
Process of Freezing:
When a liquid is cooled, its temperature decreases. As the temperature drops, the kinetic energy of the particles decreases, causing them to move more slowly. This reduction in kinetic energy allows the attractive forces between the particles to become stronger and hold them together in a more organized arrangement.
Formation of Solid Structure:
As the liquid continues to cool, the particles come closer together and eventually arrange themselves into a regular pattern. This regular arrangement forms a solid structure. The particles in a solid are closely packed and have a fixed position, which gives solids their definite shape and volume.
Examples of Freezing:
- When water is cooled below its freezing point of 0 degrees Celsius (32 degrees Fahrenheit), it turns into ice. This is a common example of freezing.
- When you put a glass of juice in the freezer, it eventually freezes and forms ice cubes.
Importance of Freezing:
Freezing is an important process in many aspects of our daily lives. Some key points include:
- Preservation of Food: Freezing is commonly used as a method of preserving food. By freezing food, the growth of bacteria and other microorganisms is slowed down, extending the shelf life of the food.
- Formation of Snow and Ice: Freezing is responsible for the formation of snowflakes and ice, which play a crucial role in the water cycle and various weather phenomena.
- Industrial Applications: Freezing is used in various industrial processes, such as the production of ice cream, frozen desserts, and frozen foods.
In conclusion, freezing is the process of changing a liquid into a solid by cooling. This transformation occurs as the particles in a liquid slow down and come closer together, forming a more ordered arrangement. Understanding the process of freezing is important in various fields, including food preservation, weather phenomena, and industrial applications.
Let's break down the process of freezing and understand it in detail:
Definition of Freezing:
Freezing is a phase transition where a substance changes from a liquid state to a solid state due to a decrease in temperature.
Process of Freezing:
When a liquid is cooled, its temperature decreases. As the temperature drops, the kinetic energy of the particles decreases, causing them to move more slowly. This reduction in kinetic energy allows the attractive forces between the particles to become stronger and hold them together in a more organized arrangement.
Formation of Solid Structure:
As the liquid continues to cool, the particles come closer together and eventually arrange themselves into a regular pattern. This regular arrangement forms a solid structure. The particles in a solid are closely packed and have a fixed position, which gives solids their definite shape and volume.
Examples of Freezing:
- When water is cooled below its freezing point of 0 degrees Celsius (32 degrees Fahrenheit), it turns into ice. This is a common example of freezing.
- When you put a glass of juice in the freezer, it eventually freezes and forms ice cubes.
Importance of Freezing:
Freezing is an important process in many aspects of our daily lives. Some key points include:
- Preservation of Food: Freezing is commonly used as a method of preserving food. By freezing food, the growth of bacteria and other microorganisms is slowed down, extending the shelf life of the food.
- Formation of Snow and Ice: Freezing is responsible for the formation of snowflakes and ice, which play a crucial role in the water cycle and various weather phenomena.
- Industrial Applications: Freezing is used in various industrial processes, such as the production of ice cream, frozen desserts, and frozen foods.
In conclusion, freezing is the process of changing a liquid into a solid by cooling. This transformation occurs as the particles in a liquid slow down and come closer together, forming a more ordered arrangement. Understanding the process of freezing is important in various fields, including food preservation, weather phenomena, and industrial applications.
When we heat a substance in solid form, it becomes liquid and then into gas. This shows that by heating, the space occupied by the substance generally:- a)Increases
- b)decrease
- c)Remains same
- d)changes minutely
Correct answer is option 'A'. Can you explain this answer?
When we heat a substance in solid form, it becomes liquid and then into gas. This shows that by heating, the space occupied by the substance generally:
a)
Increases
b)
decrease
c)
Remains same
d)
changes minutely
|
|
Akshita Sarkar answered |
By heating the molecules moves apart, hence they occupy more space.
State whether the following statement is True or False:Molecules in solids are closely packed together, which allows them to move freely.- a)True
- b)False
Correct answer is option 'B'. Can you explain this answer?
State whether the following statement is True or False:
Molecules in solids are closely packed together, which allows them to move freely.
a)
True
b)
False
|
Bespoke Classes answered |
In simple words: In solids, molecules are tightly packed together, not allowing them to move freely. This closeness gives solids their definite shape and volume.
What happens to dissolved gases in water when it is boiled?
- a)They stay dissolved
- b)They separate from water
- c)They combine with water
- d)They disappear
Correct answer is option 'B'. Can you explain this answer?
What happens to dissolved gases in water when it is boiled?
a)
They stay dissolved
b)
They separate from water
c)
They combine with water
d)
They disappear
|
|
Rohit Pillai answered |
What happens to dissolved gases in water when it is boiled?
When water is boiled, the dissolved gases in the water undergo a specific change. Let's break down what happens in detail:
Dissolved gases separation:
- When water is heated and reaches its boiling point, the kinetic energy of the water molecules increases.
- This increased kinetic energy causes the water molecules to move faster and farther apart, which leads to the breaking of the hydrogen bonds that hold the water molecules together.
- As the water molecules move apart, the dissolved gases that were previously in solution are released from the water.
- These gases, such as oxygen and carbon dioxide, have lower solubility at higher temperatures and are less likely to remain dissolved in the water when it is boiling.
Physical change:
- The separation of dissolved gases from water during boiling is a physical change, as the chemical composition of the gases and water remains the same.
- The gases simply move from a dissolved state in the water to a gaseous state above the boiling water.
Visual observation:
- You may notice bubbles forming and rising to the surface of the boiling water. These bubbles are composed of the dissolved gases that are being released as the water boils.
- This visual observation further confirms that the dissolved gases are separating from the water during the boiling process.
In conclusion, when water is boiled, the dissolved gases in the water separate from the liquid and are released into the atmosphere as bubbles. This process is a result of the increased temperature and kinetic energy of the water molecules, causing the gases to become less soluble and escape from the water.
When water is boiled, the dissolved gases in the water undergo a specific change. Let's break down what happens in detail:
Dissolved gases separation:
- When water is heated and reaches its boiling point, the kinetic energy of the water molecules increases.
- This increased kinetic energy causes the water molecules to move faster and farther apart, which leads to the breaking of the hydrogen bonds that hold the water molecules together.
- As the water molecules move apart, the dissolved gases that were previously in solution are released from the water.
- These gases, such as oxygen and carbon dioxide, have lower solubility at higher temperatures and are less likely to remain dissolved in the water when it is boiling.
Physical change:
- The separation of dissolved gases from water during boiling is a physical change, as the chemical composition of the gases and water remains the same.
- The gases simply move from a dissolved state in the water to a gaseous state above the boiling water.
Visual observation:
- You may notice bubbles forming and rising to the surface of the boiling water. These bubbles are composed of the dissolved gases that are being released as the water boils.
- This visual observation further confirms that the dissolved gases are separating from the water during the boiling process.
In conclusion, when water is boiled, the dissolved gases in the water separate from the liquid and are released into the atmosphere as bubbles. This process is a result of the increased temperature and kinetic energy of the water molecules, causing the gases to become less soluble and escape from the water.
What makes liquid flow?- a)In liquids, particles are tightly packed,
- b)In liquids, particles are packed in a rigid pattern.
- c)In liquids, particles are not tightly packed and can slide.
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
What makes liquid flow?
a)
In liquids, particles are tightly packed,
b)
In liquids, particles are packed in a rigid pattern.
c)
In liquids, particles are not tightly packed and can slide.
d)
All of these
|
|
Sanskriti Sen answered |
In liquids, particles can slide over each other which makes liquids flow.
What are atoms?- a)The smallest units of matter
- b)The biggest units of matter
- c)Tiny units of air
- d)Building blocks of water
Correct answer is option 'A'. Can you explain this answer?
What are atoms?
a)
The smallest units of matter
b)
The biggest units of matter
c)
Tiny units of air
d)
Building blocks of water
|
Tutorpedia Coaching answered |
- Atoms are like the tiniest building blocks of everything around us.
- Just like how Lego blocks help us build fun things, atoms are like the Lego blocks of matter, which is everything that has mass and takes up space.
- So, atoms are the smallest units of matter that make up everything we see and touch.
Why does a tight metal lid of a jar open easily when dipped in hot water?- a)Because hot water causes the lid to contract
- b)Because hot water causes the lid to freeze
- c)Because hot water causes the lid to evaporate
- d)Because hot water causes the lid to expand
Correct answer is option 'D'. Can you explain this answer?
Why does a tight metal lid of a jar open easily when dipped in hot water?
a)
Because hot water causes the lid to contract
b)
Because hot water causes the lid to freeze
c)
Because hot water causes the lid to evaporate
d)
Because hot water causes the lid to expand
|
|
Prabhat mehra answered |
Explanation:
Expansion of metal:
When the tight metal lid of a jar is dipped in hot water, the metal lid expands due to the increase in temperature. This expansion causes the metal to slightly deform and loosen its grip on the jar.
Thermal expansion:
Metals expand when heated and contract when cooled. This phenomenon is known as thermal expansion. When the metal lid is heated by the hot water, it expands and becomes easier to open.
Breaking the seal:
The hot water also helps in breaking the seal created between the lid and the jar due to the contraction and expansion of the materials. This makes it easier to twist and open the jar.
Softening of the seal:
The heat from the hot water softens any material used for creating the seal, such as rubber or plastic. This softening allows the lid to twist more easily, further aiding in the opening of the jar.
Conclusion:
In conclusion, the tight metal lid of a jar opens easily when dipped in hot water because the heat causes the metal lid to expand, break the seal, and soften any sealing material, making it easier to twist and open the jar.
When a liquid turns into its vapor, the process is- a)Evaporation
- b)Condensation
- c)Freezing
- d)All of these
Correct answer is option 'A'. Can you explain this answer?
When a liquid turns into its vapor, the process is
a)
Evaporation
b)
Condensation
c)
Freezing
d)
All of these
|
|
Mayank Iyer answered |
Evaporation:
Evaporation is the process by which a liquid turns into its vapor or gas state. It occurs when the molecules of a liquid gain enough energy to transform into a gas. This process happens at any temperature, but it is faster at higher temperatures.
Molecular Movement:
In a liquid, the molecules are close together and have some energy. They are in constant motion, moving and colliding with each other. Some molecules near the surface of the liquid have enough energy to overcome the attractive forces of the other molecules and escape into the air as gas molecules. This escaping of molecules from the surface of a liquid is known as evaporation.
Energy Transfer:
During evaporation, heat energy from the surroundings, such as the sun or a heat source, is transferred to the liquid. This energy increases the kinetic energy of the liquid molecules, making them move faster. As a result, some of the molecules gain enough energy to break free from the liquid and become vapor.
Factors Affecting Evaporation:
Several factors influence the rate of evaporation:
1. Temperature: Higher temperatures provide more energy to the liquid molecules, increasing their kinetic energy and the rate of evaporation.
2. Surface Area: A larger surface area allows more liquid molecules to be exposed to the air, increasing the rate of evaporation.
3. Humidity: The amount of water vapor already present in the air affects evaporation. When the air is already saturated with water vapor, the rate of evaporation decreases.
4. Air Movement: Moving air carries away the water vapor molecules from the surface of the liquid, promoting faster evaporation.
Importance of Evaporation:
Evaporation is an essential natural process that has several important implications:
- It is a major part of the water cycle, where water from oceans, lakes, and rivers evaporates and turns into clouds, eventually leading to precipitation.
- Evaporation helps cool the body by removing heat through sweat. As the sweat evaporates from the skin, it takes away the heat and provides a cooling effect.
- It is used in various industries for processes such as drying, concentration, and purification of liquids.
Conclusion:
In summary, when a liquid turns into its vapor or gas state, the process is called evaporation. It occurs when the liquid's molecules gain enough energy to overcome the attractive forces and escape into the air. Evaporation is influenced by factors such as temperature, surface area, humidity, and air movement. It is a vital process in the water cycle, cooling mechanisms in living organisms, and industrial applications.
Evaporation is the process by which a liquid turns into its vapor or gas state. It occurs when the molecules of a liquid gain enough energy to transform into a gas. This process happens at any temperature, but it is faster at higher temperatures.
Molecular Movement:
In a liquid, the molecules are close together and have some energy. They are in constant motion, moving and colliding with each other. Some molecules near the surface of the liquid have enough energy to overcome the attractive forces of the other molecules and escape into the air as gas molecules. This escaping of molecules from the surface of a liquid is known as evaporation.
Energy Transfer:
During evaporation, heat energy from the surroundings, such as the sun or a heat source, is transferred to the liquid. This energy increases the kinetic energy of the liquid molecules, making them move faster. As a result, some of the molecules gain enough energy to break free from the liquid and become vapor.
Factors Affecting Evaporation:
Several factors influence the rate of evaporation:
1. Temperature: Higher temperatures provide more energy to the liquid molecules, increasing their kinetic energy and the rate of evaporation.
2. Surface Area: A larger surface area allows more liquid molecules to be exposed to the air, increasing the rate of evaporation.
3. Humidity: The amount of water vapor already present in the air affects evaporation. When the air is already saturated with water vapor, the rate of evaporation decreases.
4. Air Movement: Moving air carries away the water vapor molecules from the surface of the liquid, promoting faster evaporation.
Importance of Evaporation:
Evaporation is an essential natural process that has several important implications:
- It is a major part of the water cycle, where water from oceans, lakes, and rivers evaporates and turns into clouds, eventually leading to precipitation.
- Evaporation helps cool the body by removing heat through sweat. As the sweat evaporates from the skin, it takes away the heat and provides a cooling effect.
- It is used in various industries for processes such as drying, concentration, and purification of liquids.
Conclusion:
In summary, when a liquid turns into its vapor or gas state, the process is called evaporation. It occurs when the liquid's molecules gain enough energy to overcome the attractive forces and escape into the air. Evaporation is influenced by factors such as temperature, surface area, humidity, and air movement. It is a vital process in the water cycle, cooling mechanisms in living organisms, and industrial applications.
Which of these statements is NOT TRUE?- a)Air is not matter as we cannot see it
- b)The smallest particle of an element is an atom.
- c)In a solid, the molecules are close together than in a gas.
- d)Matter is made up of atoms and molecules.
Correct answer is option 'A'. Can you explain this answer?
Which of these statements is NOT TRUE?
a)
Air is not matter as we cannot see it
b)
The smallest particle of an element is an atom.
c)
In a solid, the molecules are close together than in a gas.
d)
Matter is made up of atoms and molecules.
|
Rohini Seth answered |
Air is matter because:
- It occupies space.
- It has weight.
Thus, the statement 'Air is not matter as we cannot see it' is NOT TRUE
Water at room temperature is- a)A solid
- b)A liquid
- c)A gas
- d)Water vapor
Correct answer is option 'B'. Can you explain this answer?
Water at room temperature is
a)
A solid
b)
A liquid
c)
A gas
d)
Water vapor
|
|
Sanskriti Bose answered |
Water at room temperature is in the liquid state.
What happens to the intermolecular space when a solid is heated and changes into a liquid?- a)It increases.
- b)It decreases.
- c)It remains the same.
- d)It vanishes completely.
Correct answer is option 'A'. Can you explain this answer?
What happens to the intermolecular space when a solid is heated and changes into a liquid?
a)
It increases.
b)
It decreases.
c)
It remains the same.
d)
It vanishes completely.
|
|
Edu Impact answered |
Answer: A
Explanation: Heating causes molecules in solids to gain energy, increasing their intermolecular space, which allows the solid to transition into a liquid.
Explanation: Heating causes molecules in solids to gain energy, increasing their intermolecular space, which allows the solid to transition into a liquid.
The forces of attraction between molecules is greatest in the _________ state.- a)Liquid
- b)Gaseous
- c)Solid
- d)All the above
Correct answer is option 'C'. Can you explain this answer?
The forces of attraction between molecules is greatest in the _________ state.
a)
Liquid
b)
Gaseous
c)
Solid
d)
All the above
|
|
Ashish Malik answered |
Understanding Molecular Attraction
The forces of attraction between molecules vary across different states of matter: solids, liquids, and gases. Let's explore why these forces are strongest in the solid state.
1. Molecular Arrangement
- In solids, molecules are closely packed together in a fixed and orderly arrangement.
- This tight packing allows for stronger interactions between neighboring molecules.
2. Forces of Attraction
- The attraction between molecules in solids is due to strong intermolecular forces such as ionic bonds, covalent bonds, or Van der Waals forces.
- These forces hold the molecules firmly in place, preventing them from moving freely.
3. Comparison with Other States
- In liquids, molecules are still close but can move past one another, which weakens the attractive forces compared to solids.
- In gases, molecules are far apart and move freely, resulting in very weak intermolecular forces. The distance between molecules in gases is significantly greater, leading to minimal attraction.
4. Implications
- The strong forces of attraction in solids result in definite shape and volume.
- In contrast, liquids have a definite volume but take the shape of their container, while gases have neither definite shape nor volume.
Conclusion
In summary, the forces of attraction are greatest in the solid state due to the close packing of molecules and the strong intermolecular forces that dominate. This understanding is fundamental in the study of matter and its properties.
The forces of attraction between molecules vary across different states of matter: solids, liquids, and gases. Let's explore why these forces are strongest in the solid state.
1. Molecular Arrangement
- In solids, molecules are closely packed together in a fixed and orderly arrangement.
- This tight packing allows for stronger interactions between neighboring molecules.
2. Forces of Attraction
- The attraction between molecules in solids is due to strong intermolecular forces such as ionic bonds, covalent bonds, or Van der Waals forces.
- These forces hold the molecules firmly in place, preventing them from moving freely.
3. Comparison with Other States
- In liquids, molecules are still close but can move past one another, which weakens the attractive forces compared to solids.
- In gases, molecules are far apart and move freely, resulting in very weak intermolecular forces. The distance between molecules in gases is significantly greater, leading to minimal attraction.
4. Implications
- The strong forces of attraction in solids result in definite shape and volume.
- In contrast, liquids have a definite volume but take the shape of their container, while gases have neither definite shape nor volume.
Conclusion
In summary, the forces of attraction are greatest in the solid state due to the close packing of molecules and the strong intermolecular forces that dominate. This understanding is fundamental in the study of matter and its properties.
Which of the following is a physical change?- a)Rusting of iron
- b)Cooking of food
- c)Evaporation of water
- d)Rotting of fruits
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a physical change?
a)
Rusting of iron
b)
Cooking of food
c)
Evaporation of water
d)
Rotting of fruits
|
|
Anuj Kulkarni answered |
Physical changes involve a change in the state or form of a substance without altering its chemical composition. In other words, the substance remains the same at the molecular level. Among the given options, the physical change is:
b) Cooking of food
Explanation:
Cooking food is a physical change because it involves the application of heat, which causes a change in the state or form of the food without altering its chemical composition. Here is a detailed explanation:
1. Change in State: When food is cooked, it undergoes a change in state. For example, raw vegetables become softer and more tender when cooked. This change in texture is due to the heat breaking down the cell walls in the vegetables, making them easier to chew and digest.
2. Change in Appearance: Cooking also causes a change in the appearance of food. Raw meat, for instance, turns from pink or red to brown when cooked. This change in color is due to the heat-induced chemical reactions that occur in the proteins of the meat.
3. No New Substances Formed: Despite the changes in state and appearance, the chemical composition of the food remains the same. The molecules and atoms that make up the food do not undergo any chemical reactions or rearrangements during the cooking process.
4. Reversible Change: Physical changes, such as cooking, are usually reversible. If we were to cool down the cooked food, it would return to its original state, although its texture might be slightly altered.
Other options:
a) Rusting of iron: Rusting of iron is a chemical change because it involves the reaction of iron with oxygen in the presence of moisture, leading to the formation of iron oxide (rust). This change is irreversible and results in the formation of a new substance.
c) Evaporation of water: Evaporation of water is a physical change because it involves the change of water from its liquid state to a gaseous state (water vapor) due to the application of heat. The chemical composition of water remains the same during evaporation.
d) Rotting of fruits: Rotting of fruits is a chemical change because it involves the breakdown of organic compounds in the fruit by microorganisms, such as bacteria or fungi. This decomposition process leads to the formation of new substances and the release of unpleasant odors.
b) Cooking of food
Explanation:
Cooking food is a physical change because it involves the application of heat, which causes a change in the state or form of the food without altering its chemical composition. Here is a detailed explanation:
1. Change in State: When food is cooked, it undergoes a change in state. For example, raw vegetables become softer and more tender when cooked. This change in texture is due to the heat breaking down the cell walls in the vegetables, making them easier to chew and digest.
2. Change in Appearance: Cooking also causes a change in the appearance of food. Raw meat, for instance, turns from pink or red to brown when cooked. This change in color is due to the heat-induced chemical reactions that occur in the proteins of the meat.
3. No New Substances Formed: Despite the changes in state and appearance, the chemical composition of the food remains the same. The molecules and atoms that make up the food do not undergo any chemical reactions or rearrangements during the cooking process.
4. Reversible Change: Physical changes, such as cooking, are usually reversible. If we were to cool down the cooked food, it would return to its original state, although its texture might be slightly altered.
Other options:
a) Rusting of iron: Rusting of iron is a chemical change because it involves the reaction of iron with oxygen in the presence of moisture, leading to the formation of iron oxide (rust). This change is irreversible and results in the formation of a new substance.
c) Evaporation of water: Evaporation of water is a physical change because it involves the change of water from its liquid state to a gaseous state (water vapor) due to the application of heat. The chemical composition of water remains the same during evaporation.
d) Rotting of fruits: Rotting of fruits is a chemical change because it involves the breakdown of organic compounds in the fruit by microorganisms, such as bacteria or fungi. This decomposition process leads to the formation of new substances and the release of unpleasant odors.
When a solid is heated, it melts to form- a)A liquid
- b)a steam
- c)Ice
- d)A viscous liquid
Correct answer is option 'A'. Can you explain this answer?
When a solid is heated, it melts to form
a)
A liquid
b)
a steam
c)
Ice
d)
A viscous liquid
|
|
Akshita Sarkar answered |
Solids melt to form liquids.
Water vapor and steam are similar because they- a)have no definite shape and no definite volume.
- b)Have definite shape and no definite volume.
- c)Have no definite shape but definite volume
- d)Has definite mass and definite volume
Correct answer is option 'A'. Can you explain this answer?
Water vapor and steam are similar because they
a)
have no definite shape and no definite volume.
b)
Have definite shape and no definite volume.
c)
Have no definite shape but definite volume
d)
Has definite mass and definite volume
|
|
Anirban Saini answered |
Water vapor and steam are the gaseous states of matter. Gases have no definite shape and no definite volume.
Chapter doubts & questions for Solids, Liquids and Gases - Science Class 5 2025 is part of Class 5 exam preparation. The chapters have been prepared according to the Class 5 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 5 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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