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Mindmap: Matter in our Surroundings | Science Class 9

The document Mindmap: Matter in our Surroundings | Science Class 9 is a part of the Class 9 Course Science Class 9.
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FAQs on Mindmap: Matter in our Surroundings - Science Class 9

1. What is matter and how is it defined?
Ans. Matter is anything that has mass and occupies space. It can be defined as the substance that makes up physical objects and can exist in three states - solid, liquid, and gas.
2. What are the characteristics of solid, liquid, and gas?
Ans. - Solids have a definite shape and volume. The particles in a solid are closely packed and have strong intermolecular forces. - Liquids have a definite volume but no fixed shape. The particles in a liquid are loosely packed and have weaker intermolecular forces compared to solids. - Gases have neither a definite shape nor volume. The particles in a gas are far apart and have very weak intermolecular forces.
3. How does the temperature affect the state of matter?
Ans. The state of matter can change with a change in temperature. Increasing the temperature generally causes a substance to change from a solid to a liquid and then to a gas. Decreasing the temperature causes the reverse changes.
4. What is the difference between evaporation and boiling?
Ans. Evaporation is the process in which a liquid changes into a gas at temperatures below its boiling point. It occurs only at the surface of the liquid. Boiling, on the other hand, is the process in which a liquid changes into a gas at its boiling point throughout the bulk of the liquid.
5. What are the factors affecting the rate of evaporation?
Ans. The rate of evaporation is influenced by factors such as temperature, surface area, humidity, and the presence of wind. Higher temperatures, larger surface areas, lower humidity, and increased wind speed all contribute to a faster rate of evaporation.
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