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. 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. It involves a chemical reaction and changes the composition of the original substance. Examples include rusting, burning, and ripening.

Front

Is melting chocolate a physical or chemical change?

Back

Melting chocolate is a physical change.

Front

What happens to water when it freezes?

Back

When water freezes, it undergoes a physical change to become ice.

Front

What is an example of a physical change involving sugar?

Back

Dissolving sugar in water is an example of a physical change.

Front

What is an example of a chemical change involving bananas?

Back

Green bananas turning yellow as they ripen is an example of a chemical change.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.

Front

Can a chemical change be reversed?

Back

Chemical changes are often not reversible by simple physical means, as they result in new substances.

Front

What is an example of a physical change in nature?

Back

An example of a physical change in nature is the melting of snow.