Match the columns. 1. Solid to liquid a. least intermolecular spaces 2. Liquid to gas b. least intermolecular forces 3. Solid c. melting 4. Gas d. mode of heat transfer 5. Conduction e. evaporation

1. Solid to liquid- c. melting The change from the solid state to the liquid state on heating at a fixed temperature is called melting. 2. Liquid to gas- e. evaporation Evaporation is a process by which a liquid changes into vapour. The change of state from liquid to vapour at all temperatures from the surface of the liquid is called evaporation. 3. Solid- a. least intermolecular spaces When intermolecular force is very strong and kinetic energy is very small, the intermolecular space is reduced and matter exists as a solid. 4. Gas- b. least intermolecular forces When intermolecular force is negligible, and kinetic energy is very high, matter exists as a gas. 5. Conduction- d. mode of heat transfer Conduction is the method of transfer of heat within an object or from one object to the other by the process of collision of molecules vibrating at their mean positions. 1. Solid to liquid c. melting 2. Liquid to gas e. evaporation 3. Solid a. least intermolecular spaces 4. Gas b. least intermolecular forces 5. Conduction d. mode of heat transfer

E M B I B E

Living Science Physics 8>Chapter 1 - Matter>Exercises>Q C

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The intermolecular force of attraction increases when intermolecular space increases.

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Important Questions on Matter

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Living Science Physics 8>Chapter 1 - Matter>Exercises>Q C

If the molecules in a substance have very large kinetic energies, which can completely overcome the intermolecular force of attraction between them, then the substance is a liquid.

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Living Science Physics 8>Chapter 1 - Matter>Exercises>Q C

When a gas is cooled, its molecules lose energy and slow down.

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Living Science Physics 8>Chapter 1 - Matter>Exercises>Q C

The force of attraction between the molecules of water and that of glass is the force of cohesion.

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Living Science Physics 8>Chapter 1 - Matter>Exercises>Q C

The process of change of state from the gaseous state directly to solid state is called sublimation.

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Living Science Physics 8>Chapter 1 - Matter>Exercises>Q D

Match the columns.

1. Solid to liquid	a. least intermolecular spaces
2. Liquid to gas	b. least intermolecular forces
3. Solid	c. melting
4. Gas	d. mode of heat transfer
5. Conduction	e. evaporation