Phase Change Flashcard

Front

What is a phase change?

Back

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

Front

What happens to water molecules when energy is removed?

Back

The water molecules move slower and start moving in place.

Front

What is kinetic energy?

Back

Kinetic energy is the energy that an object possesses due to its motion.

Front

How does temperature affect molecular movement?

Back

As temperature increases, molecules move faster; as temperature decreases, molecules move slower.

Front

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

Back

In solids, molecules are tightly 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 occurs during melting?

Back

During melting, a solid absorbs energy and changes into a liquid.

Front

What occurs during freezing?

Back

During freezing, a liquid loses energy and changes into a solid.

Front

What is evaporation?

Back

Evaporation is the process where liquid turns into gas at temperatures below boiling point.

Front

What is condensation?

Back

Condensation is the process where gas turns into liquid when it loses energy.

Front

What is sublimation?

Back

Sublimation is the phase change where a solid turns directly into a gas without becoming a liquid.