Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, resulting in a change in chemical composition.

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

Give an example of a chemical change.

Back

Rusting of a bicycle is an example of a chemical change.

Front

Give an example of a physical change.

Back

Tearing up a newspaper is an example of a physical change.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules rearrange to form new substances.

Front

What is an indicator that a chemical change has occurred?

Back

The formation of a gas is an indicator that a chemical change has occurred.

Front

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

Back

In a chemical change, a new substance is formed, while in a physical change, no new substance is formed.

Front

What happens to a copper penny over time?

Back

A copper penny can turn greenish due to a chemical change called oxidation.

Front

What is an example of a physical change that can be reversed?

Back

Melting ice is an example of a physical change that can be reversed.

Front

What is an example of a chemical change that cannot be reversed?

Back

Burning wood is an example of a chemical change that cannot be reversed.