Question

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What happens to the particles of a solid when the solid changes into a liquid?

A. They increase in size.

B. They decrease in size.

C. The attractive force between them increases.

D. The attractive force between them decreases.

Answer 1

Answer:

C

Explanation:

if you heat up a solid - you give it some energy. This causes the particles to move more and the solid to change into a liquid, or melt. If the liquid is heated then it may evaporate and turn into a gas. Taking energy away from a gas (cooling it down) may cause it to turn into a liquid - or condense.

Answer 2

Answer: D. The attractive force between them decreases.

Explanation:

Solid state : It is a state in which the particles are closely packed and does not have any space between them. They have strong intermolecular forces of attraction between them. This state has a definite shape and volume.

Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another.Theintermolecular forces are less as compared to the solids.This state has a definite volume but does not have a fixed shape.

Fusion process is a process where solid state changes to liquid state.The size of particles remain same but the attractive forces between them decrease, thus leading to a random motion of particles.