Phase Change 3 703

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 melting?

Back

During melting, molecules gain energy, move faster, and overcome their fixed positions, transitioning from solid to liquid.

Front

What is evaporation?

Back

Evaporation is the process where molecules at the surface of a liquid gain enough energy to enter the gas phase.

Front

What is condensation?

Back

Condensation is the process where gas molecules lose energy and transition back to the liquid phase.

Front

What is freezing?

Back

Freezing is the process where a liquid loses energy and its molecules slow down, transitioning to a solid state.

Front

What is sublimation?

Back

Sublimation is the phase change where a solid directly transitions to a gas without becoming a liquid.

Front

What is deposition?

Back

Deposition is the phase change where a gas transitions directly to a solid without becoming a liquid.

Front

How does temperature affect phase changes?

Back

Temperature changes can provide or remove energy, causing substances to change from one phase to another.

Front

What is the role of energy in phase changes?

Back

Energy is required to overcome molecular attractions during phase changes; adding energy can cause melting or evaporation, while removing energy can cause freezing or condensation.

Front

What is the difference between boiling and evaporation?

Back

Boiling occurs throughout the liquid at a specific temperature, while evaporation occurs only at the surface at any temperature.