4.5 Phase Change Final Assessment

Front

What happens to water molecules when the temperature increases?

Back

The molecules start moving faster.

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 are the three main states of matter?

Back

Solid, liquid, and gas.

Front

How do molecules behave in a solid state?

Back

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

Front

How do molecules behave in a liquid state?

Back

In a liquid, molecules are close together but can move past one another, allowing the liquid to flow.

Front

How do molecules behave in a gas state?

Back

In a gas, molecules are far apart and move freely, filling the space available.

Front

What is the effect of adding heat to a solid?

Back

Adding heat can cause the solid to melt and change into a liquid.

Front

What is the effect of removing heat from a gas?

Back

Removing heat can cause the gas to condense into a liquid.

Front

What is evaporation?

Back

Evaporation is the process by which molecules at the surface of a liquid gain enough energy to become gas.

Front

What is condensation?

Back

Condensation is the process by which gas molecules lose energy and change back into a liquid.