Front

What is a phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another due to the addition or removal of energy.

Front

What happens to molecules during a phase change from solid to liquid?

Back

The molecules gain energy, move faster, and overcome some of the attractions between them, allowing them to move around each other.

Front

What is the effect of temperature on molecular movement?

Back

As temperature increases, molecules move faster; as temperature decreases, molecules move slower.

Front

What is the difference between evaporation and boiling?

Back

Evaporation occurs at the surface of a liquid at any temperature, while boiling occurs throughout the liquid at a specific temperature.

Front

What is condensation?

Back

Condensation is the process where gas turns into a liquid, usually when it loses energy and cools down.

Front

What is sublimation?

Back

Sublimation is the phase change from solid directly to gas without passing through the liquid state.

Front

What is freezing?

Back

Freezing is the process where a liquid turns into a solid as it loses energy and its molecules slow down.

Front

What is melting?

Back

Melting is the process where a solid turns into a liquid as it gains energy and its molecules move faster.

Front

What is the role of energy in phase changes?

Back

Energy is required to change the phase of a substance; adding energy can cause melting or evaporation, while removing energy can cause freezing or condensation.

Front

What happens to the arrangement of molecules during a phase change from liquid to gas?

Back

The molecules move further apart and gain enough energy to overcome the attractions between them.