Changes in States of Matter

Front

What causes matter to change state?

Back

Matter changes state when enough energy (heat) is added to or removed from the molecules.

Front

True or False: As temperature decreases, molecules collide more, move faster, and spread out.

Back

False. As temperature decreases, molecules move slower and come closer together.

Front

What is needed for both boiling and melting to occur?

Back

Heat is needed for both boiling and melting to occur.

Front

Do molecules ever stop moving?

Back

Molecules never stop moving; they always have some energy.

Front

What happens to matter when energy is added or removed?

Back

Matter changes state when energy is added or removed.

Front

What is the state of matter that has a definite shape and volume?

Back

Solid has a definite shape and volume.

Front

What is the state of matter that has a definite volume but takes the shape of its container?

Back

Liquid has a definite volume but takes the shape of its container.

Front

What is the state of matter that has no definite shape or volume?

Back

Gas has no definite shape or volume.

Front

What happens to the energy of molecules as they change from solid to liquid?

Back

The energy of molecules increases as they change from solid to liquid.

Front

What is the process called when a liquid turns into a gas?

Back

The process is called evaporation or boiling.