Unit 3 | Chemical and Physical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

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

Front

What happens to water when it freezes?

Back

When water freezes, heat is removed, and a solid (ice) is formed.

Front

What happens to water when it boils?

Back

When water boils, heat is added, causing it to change from a liquid to a gas (steam).

Front

Is melting ice a physical or chemical change?

Back

Melting ice is a physical change.

Front

Is burning wood a physical or chemical change?

Back

Burning wood is a chemical change.

Front

What is an example of a physical change?

Back

An example of a physical change is dissolving sugar in water.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron.

Front

What is the effect of heat on the state of matter?

Back

Adding heat generally causes substances to change from solid to liquid to gas, while removing heat causes them to change from gas to liquid to solid.

Front

What is condensation?

Back

Condensation is the process where gas changes into a liquid, often when it cools down.