Phase Changes and Particle Motion

Front

What is a phase change?

Back

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

Front

What happens to molecules during melting?

Back

During melting, molecules gain energy and move faster, transitioning from a solid state to a liquid state.

Front

What is evaporation?

Back

Evaporation is the process where liquid turns into gas, usually occurring at the surface of the liquid.

Front

What is condensation?

Back

Condensation is the process where gas turns into liquid, often when the gas cools down.

Front

What is the freezing point of water?

Back

The freezing point of water is 0°C.

Front

What is the melting point of water?

Back

The melting point of water is also 0°C.

Front

Which state of matter has a definite shape and volume?

Back

Solid has a definite shape and volume.

Front

Which state of matter has molecules that are far apart and move freely?

Back

Gas has molecules that are far apart and move freely.

Front

What is the relationship between temperature and particle motion?

Back

As temperature increases, particle motion increases; as temperature decreases, particle motion decreases.

Front

What happens to the molecules in a solid?

Back

In a solid, molecules are closely packed together and vibrate in place.