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L1 - States of Matter - Matter in our Surrounding, Class 9 , Science Video Lecture

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FAQs on L1 - States of Matter - Matter in our Surrounding, Class 9 , Science Video Lecture

1. What are the three states of matter?
Ans. The three states of matter are solid, liquid, and gas. These states are determined by the arrangement of particles in a substance and the energy of those particles.
2. How does temperature affect the state of matter?
Ans. Temperature affects the state of matter by changing the energy of the particles in a substance. As the temperature increases, particles gain energy and move faster, causing a solid to become a liquid and a liquid to become a gas. As the temperature decreases, particles lose energy and move slower, causing a gas to become a liquid and a liquid to become a solid.
3. What is the difference between a physical and a chemical change?
Ans. A physical change is a change in the state or appearance of a substance, such as melting, boiling, or breaking. These changes do not alter the chemical composition of the substance. A chemical change, on the other hand, is a change in which a new substance is formed. Examples include burning, rusting, and reacting with acid.
4. What is sublimation?
Ans. Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state. This occurs when the temperature and pressure are such that the particles in the solid have enough energy to break free from the solid and move directly into the gas phase.
5. What is the difference between evaporation and boiling?
Ans. Evaporation is the process in which a liquid changes into a gas at the surface of the liquid. This occurs when the particles at the surface of the liquid gain enough energy to escape into the air. Boiling, on the other hand, is the process in which a liquid changes into a gas throughout the entire volume of the liquid. This occurs when the temperature of the liquid is raised to its boiling point, causing bubbles of gas to form throughout the liquid.
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