Exam Review Changes of State of Matter (Science Bits)

Front

What happens to molecules when heat is applied to a substance?

Back

Molecules expand.

Front

What happens to the volume of a substance when it is heated?

Back

The volume increases.

Front

In the balloon experiment, what happens to the mass and volume when heated?

Back

The mass remains unchanged, but the volume changes.

Front

What is an example of evaporation?

Back

Vaporization only at the surface.

Front

What happens to the density of a substance when heat is applied?

Back

The density decreases.

Front

Define 'melting' in terms of changes of state.

Back

Melting is the process where a solid turns into a liquid when heat is applied.

Front

What is 'freezing'?

Back

Freezing is the process where a liquid turns into a solid when heat is removed.

Front

Explain 'condensation' in the context of changes of state.

Back

Condensation is the process where a gas turns into a liquid when it cools down.

Front

What is 'sublimation'?

Back

Sublimation is the process where a solid turns directly into a gas without becoming a liquid.

Front

What is the relationship between temperature and kinetic energy of molecules?

Back

As temperature increases, the kinetic energy of molecules increases.