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Changes in States of Matter - Is Matter Around us Pure? Video Lecture - Class 9

FAQs on Changes in States of Matter - Is Matter Around us Pure? Video Lecture - Class 9

1. What are the different states of matter?
Ans. The different states of matter are solid, liquid, and gas. In solids, particles are closely packed together and have a fixed shape and volume. Liquids have particles that are close together but can move around, giving them a definite volume but no fixed shape. Gases have particles that are far apart and can move freely, occupying the entire space available to them.
2. How does matter change its state?
Ans. Matter can change its state through heating or cooling. When a solid is heated, it gains energy and its particles vibrate faster, eventually breaking the forces holding them in place and turning into a liquid. Further heating turns the liquid into a gas by increasing the energy of the particles to the point where they can overcome the forces of attraction between them. Cooling, on the other hand, removes energy from matter, causing the particles to slow down and eventually form a solid.
3. What is the process of condensation?
Ans. Condensation is the process by which a gas changes into a liquid state. It occurs when the temperature of a gas is lowered, causing the particles to lose energy and slow down. As a result, the particles come closer together and form bonds, leading to the formation of liquid droplets. This process is commonly observed when steam condenses into water droplets on a cold surface, such as a mirror or a window.
4. Can matter exist in multiple states at the same time?
Ans. Yes, matter can exist in multiple states at the same time under certain conditions. For example, during the process of melting, both solid and liquid states of matter can coexist. At the melting point, the solid begins to change into a liquid, but some solid particles may still remain. This coexistence of states is also observed during boiling, where both liquid and gas phases can be present.
5. What is sublimation and give an example?
Ans. Sublimation is the process in which a substance directly changes from a solid to a gaseous state without passing through the liquid state. This occurs when the substance is heated and its particles gain enough energy to break the forces holding them together as a solid. An example of sublimation is the conversion of dry ice (solid carbon dioxide) into carbon dioxide gas without melting in between.
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