Phase Change Unit Test

Front

What is a phase?

Back

A noticeably different form or state of the same substance.

Front

What happens to molecules when a liquid turns into a solid?

Back

Before, the substance was a liquid and later a solid. The molecules move in place.

Front

What is temperature?

Back

A measure of how hot or cold something is.

Front

What do molecules look like when energy is added to a solid?

Back

The molecules moved around each other.

Front

What is molecular attraction?

Back

A pull between two molecules that is always the same for a substance.

Front

What is the difference between a solid and a liquid in terms of molecular movement?

Back

In a solid, molecules vibrate in place; in a liquid, they move around each other.

Front

What is kinetic energy?

Back

The energy that an object possesses due to its motion.

Front

What happens to the temperature of a substance when it changes phase?

Back

The temperature can increase or decrease depending on the phase change.

Front

What is an example of a phase change?

Back

Melting, freezing, condensation, and evaporation are all examples of phase changes.

Front

What is the relationship between energy and phase changes?

Back

Energy must be added or removed for a substance to change from one phase to another.