Quickly
what happens to the particles of a solid when the solid changes into a gas?
they move faster. they slow down. they increase in size. they decrease in size.

The answer is below, the first option is correct.

Explanation:

They move faster. when a solid, like ice changes into gases (vapor) the kinetic energy increases so they move faster. This is the right answer.

They slow down. Is incorrect, this change increase movement in a molecule not a decrease.

They increase in size. A change in a physic state doesn't affect the size, then is incorrect this option.

They decrease in size. A change in a physic state doesn't affect the size, then is incorrect this option.

The answer is below, the first option is correct.

Explanation:

They move faster. when a solid, like ice changes into gases (vapor) the kinetic energy increases so they move faster. This is the right answer.

They slow down. Is incorrect, this change increase movement in a molecule not a decrease.

They increase in size. A change in a physic state doesn't affect the size, then is incorrect this option.

They decrease in size. A change in a physic state doesn't affect the size, then is incorrect this option.