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In terms of physical and chemical changes, which of the following assertions is/are correct?
1. All physical changes are irreversible, while chemical changes are reversible.
2. The following may accompany a chemical change:-Sound may be produced, Heat, light or any other radiation (ultraviolet, for example) may be given or absorbed.
Use the code given below to select the correct answer :
- a)1 Only
- b)2 Only
- c)both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
In terms of physical and chemical changes, which of the following ass...
Assertion 1: All physical changes are irreversible, while chemical changes are reversible.
This assertion is incorrect. Both physical and chemical changes can be either reversible or irreversible, depending on the specific circumstances.
Physical changes involve a change in the physical properties of a substance without altering its chemical composition. Examples of physical changes include changes in state (such as melting, freezing, or boiling), changes in shape or size (such as cutting or crushing), and changes in density or solubility. While some physical changes may be reversible, such as melting and freezing, others may be irreversible, such as breaking a glass or burning a piece of paper.
Chemical changes, on the other hand, involve a transformation of one or more substances into new substances with different chemical properties. Examples of chemical changes include combustion, rusting, and digestion. Like physical changes, some chemical changes may be reversible, such as the formation and dissociation of water (H2O ⇌ H+ + OH-), while others may be irreversible, such as the decomposition of organic matter into carbon dioxide and water during combustion.
Therefore, it is incorrect to claim that all physical changes are irreversible and all chemical changes are reversible. The reversibility of a change depends on the nature of the substances involved and the conditions under which the change occurs.
Assertion 2: The following may accompany a chemical change:
- Sound may be produced: Chemical reactions often involve the breaking and formation of chemical bonds, which can result in the release or absorption of energy in the form of sound. For example, when a firework explodes, the rapid chemical reactions produce a loud sound.
- Heat, light or any other radiation (ultraviolet, for example) may be given or absorbed: Chemical reactions can also involve the release or absorption of energy in the form of heat, light, or other types of radiation. For example, when a match is struck, the friction ignites the chemicals on the match head, which then undergo a chemical reaction that releases heat and light.
These energy changes are often indicative of a chemical change taking place. However, it is important to note that not all chemical reactions exhibit these characteristics. Some reactions may occur without any noticeable release or absorption of energy.
Therefore, assertion 2 is correct. Sound, heat, light, or other forms of radiation can accompany a chemical change, although they are not necessarily present in all chemical reactions.
In conclusion, assertion 1 is incorrect as both physical and chemical changes can be reversible or irreversible. Assertion 2 is correct as sound, heat, light, or other forms of radiation can accompany a chemical change, although they may not be present in all reactions. Therefore, the correct answer is option 'B' - 2 Only.
This assertion is incorrect. Both physical and chemical changes can be either reversible or irreversible, depending on the specific circumstances.
Physical changes involve a change in the physical properties of a substance without altering its chemical composition. Examples of physical changes include changes in state (such as melting, freezing, or boiling), changes in shape or size (such as cutting or crushing), and changes in density or solubility. While some physical changes may be reversible, such as melting and freezing, others may be irreversible, such as breaking a glass or burning a piece of paper.
Chemical changes, on the other hand, involve a transformation of one or more substances into new substances with different chemical properties. Examples of chemical changes include combustion, rusting, and digestion. Like physical changes, some chemical changes may be reversible, such as the formation and dissociation of water (H2O ⇌ H+ + OH-), while others may be irreversible, such as the decomposition of organic matter into carbon dioxide and water during combustion.
Therefore, it is incorrect to claim that all physical changes are irreversible and all chemical changes are reversible. The reversibility of a change depends on the nature of the substances involved and the conditions under which the change occurs.
Assertion 2: The following may accompany a chemical change:
- Sound may be produced: Chemical reactions often involve the breaking and formation of chemical bonds, which can result in the release or absorption of energy in the form of sound. For example, when a firework explodes, the rapid chemical reactions produce a loud sound.
- Heat, light or any other radiation (ultraviolet, for example) may be given or absorbed: Chemical reactions can also involve the release or absorption of energy in the form of heat, light, or other types of radiation. For example, when a match is struck, the friction ignites the chemicals on the match head, which then undergo a chemical reaction that releases heat and light.
These energy changes are often indicative of a chemical change taking place. However, it is important to note that not all chemical reactions exhibit these characteristics. Some reactions may occur without any noticeable release or absorption of energy.
Therefore, assertion 2 is correct. Sound, heat, light, or other forms of radiation can accompany a chemical change, although they are not necessarily present in all chemical reactions.
In conclusion, assertion 1 is incorrect as both physical and chemical changes can be reversible or irreversible. Assertion 2 is correct as sound, heat, light, or other forms of radiation can accompany a chemical change, although they may not be present in all reactions. Therefore, the correct answer is option 'B' - 2 Only.
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Community Answer
In terms of physical and chemical changes, which of the following ass...
- Physical changes: Changes in the Physical Properties of a Substance are known as Physical Changes. Physical Properties of a Substance include colour, size, shape, state, temperature, odour, appearance, texture and many more.
- In addition, Physical Changes do not lead to the formation of new substances. Physical Changes may or may not be reversible. Examples of Physical Change• Breaking/Crushing of any Object• Expansion of Metal on Heating• Dissolving Sugar or Salt (Solute) in Water (Solvent) (as a result, a solution is formed)• Solidification of Molten Metal on Cooling• Shredding Paper
- Chemical Changes: One or more substances, at times, react with one another or substances which are readily available in the environment. This consequently leads to the formation of a new substance(s). The formation of the new substance can also be accompanied by one or more of the following:1. Emission of Heat (Exothermic Reaction) as a result of a Chemical Changes2. Absorption of Heat (Endothermic Reaction) as a result of a Chemical Changes3. Emission Light as a result of a Chemical Changes4. Production of Sound as a result of a Chemical Changes5. Change or emission of Odour as a result of a Chemical Changes6. Emission of Gas as a result of a Chemical Changes
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In terms of physical and chemical changes, which of the following assertions is/are correct?1. All physical changes are irreversible, while chemical changes are reversible.2. The following may accompany a chemical change:-Sound may be produced, Heat, light or any other radiation (ultraviolet, for example) may be given or absorbed.Use the code given below to select the correct answer :a) 1 Onlyb) 2 Onlyc) both 1 and 2d) Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?
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