Energy and Phase Changes

Front

What is the process called when gas changes into a liquid?

Back

Condensation

Front

What happens to particles when thermal energy is removed?

Back

Particles move closer together and slow down.

Front

What occurs when a substance sublimes?

Back

The kinetic energy of the sample increases.

Front

What is sublimation?

Back

The phase change of solid to gas.

Front

Which phase changes are exothermic?

Back

Freezing and Condensation.

Front

What is the phase change from liquid to gas called?

Back

Evaporation.

Front

What is the phase change from solid to liquid called?

Back

Melting.

Front

What happens during freezing?

Back

A liquid turns into a solid, releasing thermal energy.

Front

What is the term for the energy required to change a substance from solid to liquid?

Back

Heat of fusion.

Front

What is the term for the energy required to change a substance from liquid to gas?

Back

Heat of vaporization.