Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What are the three states of matter?

Back

Solid, liquid, and gas.

Front

What happens to the particles in a solid when it melts?

Back

The particles gain energy and move apart, changing from a solid to a liquid.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash and smoke.

Front

What is evaporation?

Back

Evaporation is the process by which liquid turns into gas.

Front

What is condensation?

Back

Condensation is the process by which gas turns into liquid.

Front

What is freezing?

Back

Freezing is the process of turning a liquid into a solid by removing thermal energy.

Front

What is boiling?

Back

Boiling is the process of turning a liquid into gas by adding thermal energy.

Front

What is the role of thermal energy in changes of state?

Back

Thermal energy is added or removed to change a substance from one state to another.