Phase Change Amplify - End of Unit 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 the molecules of a substance during a phase change?

Back

During a phase change, the molecules either gain or lose energy, which affects their movement and the forces of attraction between them.

Front

What is the role of energy in phase changes?

Back

Energy is required to overcome the attractive forces between molecules during a phase change, allowing them to move into a different state.

Front

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

Back

In solids, molecules are closely packed and vibrate in place. In liquids, molecules are close but can move around each other. In gases, molecules are far apart and move freely.

Front

What is meant by 'attraction between molecules'?

Back

Attraction between molecules refers to the forces that hold molecules together, which can vary in strength depending on the substance.

Front

How does temperature affect molecular movement?

Back

As temperature increases, molecules gain energy and move faster; as temperature decreases, they lose energy and move slower.

Front

What is the significance of the term 'melting point'?

Back

The melting point is the temperature at which a solid turns into a liquid, indicating a phase change.

Front

What is the significance of the term 'boiling point'?

Back

The boiling point is the temperature at which a liquid turns into a gas, indicating a phase change.

Front

What happens to the attraction between molecules when a substance changes from a liquid to a gas?

Back

The attraction between molecules decreases, allowing them to move freely apart from each other.

Front

What happens to the attraction between molecules when a substance changes from a gas to a liquid?

Back

The attraction between molecules increases, causing them to come closer together and move around each other.