Phase Change Practice Questions

Front

What is a phase change?

Back

A phase change is the transformation of a substance from one state of matter to another, such as solid to liquid or liquid to gas.

Front

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

Back

The molecules gain energy, move faster, and begin to slide past one another.

Front

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

Back

The molecules gain even more energy, move apart, and move freely in the gas phase.

Front

What is the state of matter where molecules are tightly packed and vibrate in place?

Back

Solid.

Front

What is the state of matter where molecules are close together but can move around each other?

Back

Liquid.

Front

What is the state of matter where molecules are far apart and move freely?

Back

Gas.

Front

What is evaporation?

Back

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

Front

What is condensation?

Back

Condensation is the process by which gas molecules lose energy and transition into the liquid phase.

Front

What is melting?

Back

Melting is the phase change from solid to liquid, occurring when a solid gains enough energy.

Front

What is freezing?

Back

Freezing is the phase change from liquid to solid, occurring when a liquid loses enough energy.