Phase Change Final Study Guide

Front

What is a phase change?

Back

A phase change is a transition of matter from one state (solid, liquid, gas) to another due to the addition or removal of energy.

Front

What happens to water molecules during evaporation?

Back

During evaporation, water molecules gain energy and escape from the liquid phase into the gas phase.

Front

Why does water boil at a lower temperature on Mars than on Earth?

Back

Water boils at a lower temperature on Mars due to lower air pressure, allowing water molecules to escape more easily.

Front

What is the independent variable in an experiment?

Back

The independent variable is the factor that is changed or controlled by the experimenter to test its effects.

Front

What is the dependent variable in an experiment?

Back

The dependent variable is the factor that is measured or observed in an experiment.

Front

What happens to chocolate when heated near a campfire?

Back

Chocolate melts because heat increases the movement of its molecules.

Front

What is condensation?

Back

Condensation is the process where water vapor cools and changes back into liquid water.

Front

What is sublimation?

Back

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

Front

What is the freezing point of water?

Back

The freezing point of water is 0 degrees Celsius (32 degrees Fahrenheit).

Front

What is the boiling point of water?

Back

The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at sea level.