Phase Change Assessment

Front

What happens to molecules when their kinetic energy decreases?

Back

They move slower.

Front

What is the difference between a substance with weaker attraction between its molecules and one with stronger attraction?

Back

A substance with weaker attraction allows its molecules to move away from each other, while a substance with stronger attraction keeps its molecules closer together.

Front

What phase change occurs when a gas turns into a liquid?

Back

Condensation.

Front

What phase change occurs when a liquid turns into a gas?

Back

Evaporation.

Front

What is the effect of adding energy to a solid?

Back

It can cause the solid to melt into a liquid.

Front

What is the effect of removing energy from a liquid?

Back

It can cause the liquid to freeze into a solid.

Front

What happens to the molecules in a substance during melting?

Back

The molecules gain energy and move apart from each other.

Front

What happens to the molecules in a substance during freezing?

Back

The molecules lose energy and move closer together.

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.