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 changes in state, shape, or size.

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 the rearrangement of atoms.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is burning wood, which produces ashes and smoke.

Front

What happens to the properties of a substance during a physical change?

Back

The properties of a substance may change, but its chemical identity remains the same.

Front

What happens to the properties of a substance during a chemical change?

Back

The properties of a substance change, and new substances with different chemical identities are formed.

Front

What is the significance of ashes after burning wood?

Back

Ashes are evidence of a chemical change because they cannot be transformed back into wood.

Front

What is the process of freezing?

Back

Freezing is the process of a liquid turning into a solid when its temperature is lowered.

Front

What is melting?

Back

Melting is the process of a solid turning into a liquid when its temperature is raised.

Front

What is an example of a reversible physical change?

Back

An example of a reversible physical change is water freezing into ice and then melting back into water.