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Changes in States of Matter Video Lecture - Crash Course: Class 9

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FAQs on Changes in States of Matter Video Lecture - Crash Course: Class 9

1. What are the three states of matter?
Ans. The three states of matter are solid, liquid, and gas.
2. What is a phase change?
Ans. A phase change is a physical change in which a substance transitions from one state of matter to another. For example, when ice melts into water, it undergoes a phase change from a solid to a liquid.
3. What is sublimation?
Ans. Sublimation is the process in which a substance transitions directly from a solid to a gas, without passing through the liquid state. An example of this is dry ice, which sublimates at room temperature.
4. What is the difference between evaporation and boiling?
Ans. Evaporation is the process in which a liquid turns into a gas at a temperature below its boiling point, while boiling is the process in which a liquid turns into a gas at its boiling point.
5. How does temperature affect the states of matter?
Ans. Temperature affects the states of matter by determining the amount of energy that particles have. As temperature increases, particles gain energy and move more quickly, causing a substance to transition from a solid to a liquid and then to a gas. Conversely, as temperature decreases, particles lose energy and move more slowly, causing a substance to transition from a gas to a liquid and then to a solid.
153 videos
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