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Chapter 1| Matter in our surrounding| Class 9 Science NCERT Video Lecture

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FAQs on Chapter 1- Matter in our surrounding- Class 9 Science NCERT Video Lecture

1. What is matter?
Ans. Matter is anything that has mass and occupies space. It can exist in three states - solid, liquid, and gas. Examples of matter include water, air, wood, and metals.
2. What are the different types of matter?
Ans. Matter can be classified into two types - pure substances and mixtures. Pure substances have a fixed composition and cannot be separated by physical methods. They can further be classified into elements and compounds. Mixtures, on the other hand, are formed by the combination of two or more substances and can be separated by physical methods.
3. What are the characteristics of solids, liquids, and gases?
Ans. Solids have a definite shape and volume, with particles closely packed together in a regular pattern. Liquids have a definite volume but take the shape of their container, with particles loosely packed and able to move past each other. Gases have neither a definite shape nor volume, with particles far apart and moving randomly.
4. How can matter change its state?
Ans. Matter can change its state through the process of heating or cooling. Heating causes particles to gain energy and move faster, leading to a change from solid to liquid (melting) and liquid to gas (evaporation). Cooling, on the other hand, causes particles to lose energy and move slower, resulting in a change from gas to liquid (condensation) and liquid to solid (freezing).
5. What is the importance of studying matter in our surroundings?
Ans. Studying matter in our surroundings is important as it helps us understand the properties and behavior of different substances. It enables us to explain various natural phenomena and processes, such as the water cycle, changes of state, and chemical reactions. This knowledge is essential in fields like chemistry, physics, and environmental science. Additionally, understanding matter helps us make informed decisions about the use and conservation of resources.
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