Unit 2 Flashcard Review: States of Matter & Thermal Energy

Front

What happens to energy when a substance changes from liquid to solid?

Back

The energy has to DECREASE.

Front

What is the average kinetic energy of all the particles in a material called?

Back

Temperature.

Front

How does heat move?

Back

Heat moves from warm places to cooler places.

Front

What is matter?

Back

Anything that has mass and volume.

Front

True or False: Atoms/molecules in solids do not move or vibrate at all.

Back

False.

Front

What is thermal energy?

Back

The total energy of all the particles in a substance.

Front

What are the three states of matter?

Back

Solid, liquid, gas.

Front

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

Back

Melting.

Front

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

Back

Evaporation.

Front

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

Back

Condensation.