Question

Give reasons for the following:-

a)Solids can be heaped together whereas liquids and gases can not be.

b)Gases have no fixed volume and no fixed shape.

c)Gases exert pressure on the walls of the container in which gases are kept

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Answer 1

Answer:

(1)Liquids always tend to flow, because the intermolecular forces between molecules is less. However in solids, the bonds are very strong and prevent molecules from moving around. This makes it easier for solids to be heaped, without losing their shape and structure.

(2)A gas is a substance with no definite volume and no definite shape. ... A gas, on the other hand, has a vol- ume that changes to match the volume of its container. Gas Composition. The molecules in a gas are very far apart compared with the molecules in a solid or a liquid.

(3)The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exerts pressure on the gas.

hope this helps u...

Answer 2

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a)Solids can be heaped together whereas liquids and gases can not be.

This is so , because solid have a fixed shape and volume so they can be heaped together where whereas gases and liquids commode have fixed shape so they cannot be heaped together .

b)Gases have no fixed volume and no fixed shape.

Gases do not have fixed shape for volume because they have last intracellular space and weak molecular force of attraction . The two molecules and located far away from each other as compared two solid and gases.

c)Gases exert pressure on the walls of the container in which gases are kept.

The molecules of gases have large intra molecular spaces and hence less intermolecular force of attraction due to which it's particle adding random motion. Due to the random motion of particle they collide with the walls of container and hence exert pressure on the walls of the container.