______ is a phase change that is exothermic.

Question

______ is a phase change that is exothermic.

Dispersion

Solidification

Melting

Boiling

Answer 1

In exothermic phase changes, energy is being RELEASED.

In Dispersion, you are going from a gas to a solid. (higher kinetic energy to lower)

In Solidification, you are going from a liquid to a solid. (higher kinetic energy to lower)

In Melting, you are going from a solid to a liquid. (lower kinetic energy to higher)

In boiling, you are going from a liquid to a gas. (lower kinetic energy to higher)

Because dispersion and solidification go from high to low levels of energy, energy is being released and they are exothermic.