What happens to the molecules of a substance as it changes state from solid to liquid to gas?

Answer 1

The molecules slow down.

Answer 2

Molecules in a solid are tightly packed together, that's what makes it a solid. As it begins to change phase to liquid, usually as the result of some form of heat being applied, the molecules begin to move faster and roll past eachother and "flow"

Molecules in the gaseous state are moving at their fastest and will expand to fill the available space.

Answer 3

The average distance between nearest neighbor molecules greatly increases.

Answer 4

This physical phenomenon (a change of phase) is called melting; during melting the chemical nature of molecules is not changed but the bonds between molecules are weakened.

Answer 5

they would expand

Answer 6

The molecules slow down.