Phase Change Amplify - End of Unit Study Guide

Front

What happens to water molecules when the temperature increases?

Back

The molecules start moving faster.

Front

How do molecules behave in a gas phase compared to a liquid phase?

Back

In a gas phase, molecules move faster and are farther apart; in a liquid phase, they move slower and are closer together.

Front

What is a phase change?

Back

A phase change is the transformation of a substance from one state of matter to another, such as solid to liquid or liquid to gas.

Front

What effect does transferring energy out of a substance have on its molecules?

Back

It slows down the molecules and can cause a phase change.

Front

What is the relationship between molecular attraction and phase changes?

Back

Stronger molecular attraction can prevent a substance from changing phase, while weaker attraction allows for phase changes.

Front

What occurs to the molecules of a substance when it freezes?

Back

The molecules move slower and become more closely packed together.

Front

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

Back

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

Front

What happens to the temperature of a substance during a phase change?

Back

The temperature remains constant during a phase change, even though energy is being added or removed.

Front

What is evaporation?

Back

Evaporation is the process where molecules at the surface of a liquid gain enough energy to enter the gas phase.

Front

What is condensation?

Back

Condensation is the process where gas molecules lose energy and transition into the liquid phase.