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Matter in our surroundings Video Lecture - Class 9
FAQs on Matter in our surroundings Video Lecture - Class 9
| 1. What is matter and how is it defined? |  |
Ans. Matter is anything that occupies space and has mass. It is defined as any substance that has both mass and volume. Matter can exist in different physical states such as solid, liquid, and gas.
| 2. What are the different types of matter? | |
Ans. The different types of matter are classified into elements, compounds, and mixtures. Elements are pure substances that cannot be broken down into simpler substances by any physical or chemical means. Compounds are substances made up of two or more elements chemically combined in fixed proportions. Mixtures are a combination of two or more substances that are physically combined and can be separated by physical means.
| 3. What are the characteristics of solids, liquids, and gases? | |
Ans. Solids have a definite shape and volume, and their particles are closely packed and arranged in a regular pattern. Liquids have a definite volume but no fixed shape, and their particles are close together but can move past each other. Gases have neither a definite shape nor a definite volume, and their particles are far apart and move freely in all directions.
| 4. How can matter undergo changes in its physical state? | |
Ans. Matter can undergo changes in its physical state through heating or cooling. When matter is heated, it gains energy, and its particles move faster, leading to a change in state from solid to liquid (melting) and from liquid to gas (evaporation). On the other hand, when matter is cooled, it loses energy, and its particles move slower, resulting in a change in state from gas to liquid (condensation) and from liquid to solid (freezing).
| 5. Can matter be created or destroyed? | |
Ans. According to the law of conservation of mass, matter cannot be created or destroyed in a chemical reaction. It can only change its form or undergo a physical or chemical change. This means that the total mass of the substances before and after a reaction remains constant.
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Dec 21, 2024 Last updated |
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