Class 9 > Crash Course for Class 9 > Matter in Our Surroundings- 1
Matter in Our Surroundings- 1 Video Lecture - Crash Course for Class 9
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FAQs on Matter in Our Surroundings- 1 Video Lecture - Crash Course for Class 9
| 1. What is matter and why is it important? |  |
Ans. Matter refers to anything that has mass and occupies space. It can exist in three states - solid, liquid, and gas. Matter is important because it is the building block of everything around us. All objects, substances, and materials are composed of matter.
| 2. What are the different properties of matter? | |
Ans. Matter has several properties that help us identify and classify different substances. Some common properties of matter include mass, volume, density, solubility, conductivity, and melting/boiling points. These properties can be used to differentiate between different types of matter and understand their behavior.
| 3. How does matter change its state? | |
Ans. Matter can change its state by gaining or losing energy. When matter gains energy, its particles move faster, and it changes from a solid to a liquid (melting) or from a liquid to a gas (evaporation). When matter loses energy, its particles slow down, and it changes from a gas to a liquid (condensation) or from a liquid to a solid (freezing).
| 4. What is the difference between a physical change and a chemical change in matter? | |
Ans. A physical change in matter refers to a change in its physical properties, such as shape, size, or state, without altering its chemical composition. Examples of physical changes include melting ice, boiling water, or crushing a can. On the other hand, a chemical change in matter involves a transformation at the molecular level, resulting in the formation of new substances with different chemical properties. Examples of chemical changes include burning wood, rusting of iron, or digestion of food.
| 5. Why do substances have different boiling points? | |
Ans. The boiling point of a substance depends on the strength of the forces of attraction between its particles. Substances with strong intermolecular forces require more energy to break these forces and reach the boiling point. Therefore, they have higher boiling points. On the other hand, substances with weak intermolecular forces have lower boiling points. The boiling point can also be influenced by factors such as pressure, altitude, and impurities in the substance.
Video Description: Matter in Our Surroundings- 1 for Class 9 2023 is part of Crash Course for Class 9 preparation.
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