physical and chemical changes 501

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without changing its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and cooking.

Front

Is melting butter a physical or chemical change?

Back

Melting butter is a physical change because it changes from solid to liquid but remains butter.

Front

Is rusting a physical or chemical change?

Back

Rusting is a chemical change because it forms a new substance, iron oxide, from iron and oxygen.

Front

What happens to the matter in a physical change?

Back

In a physical change, the matter remains the same; it only changes in form or appearance.

Front

What happens to the matter in a chemical change?

Back

In a chemical change, the matter changes into one or more new substances with different properties.

Front

Can a chemical change be reversed?

Back

Most chemical changes are not easily reversible, unlike physical changes.

Front

What is an example of a physical change?

Back

An example of a physical change is butter melting.

Front

What is an example of a chemical change?

Back

An example of a chemical change is a metal rusting.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not create a new substance, while a chemical change does.