Phase Change Assessment

Front

What happens to water molecules when the temperature increases?

Back

The molecules start moving faster.

Front

What happens to fuel molecules when the temperature decreases?

Back

The molecules start moving slower.

Front

How do substances differ if one changes phase and the other does not after losing energy?

Back

The substance that changed phase has a weaker attraction between its molecules than the other substance.

Front

Are the molecules in a solid always moving?

Back

No, they vibrate in place but do not move freely.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of motion that molecules possess.

Front

What happens to molecules when their kinetic energy decreases?

Back

They move slower.

Front

What is the relationship between temperature and molecular movement?

Back

As temperature increases, molecular movement increases.

Front

What is a phase change?

Back

A phase change is a transition of matter from one state to another, such as solid to liquid.

Front

What occurs at the molecular level during melting?

Back

Molecules gain energy and move apart, transitioning from solid to liquid.

Front

What occurs at the molecular level during freezing?

Back

Molecules lose energy and come closer together, transitioning from liquid to solid.