Chemical Changes

Front

What is a chemical change?

Back

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

Front

Which of the following is NOT evidence of a chemical change?

Back

Melting.

Front

What evidence indicates a chemical change has occurred?

Back

Unexpected color change, gas produced, temperature change, or formation of a precipitate.

Front

What happens to the substances in a chemical change?

Back

They are transformed into new substances with different properties.

Front

Can most chemical changes be reversed?

Back

No, most chemical changes cannot be reversed.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

Give an example of a physical change.

Back

Making a paper airplane.

Front

What is an indicator of a chemical change when wood is burned?

Back

It releases ash and smoke.

Front

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

Back

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

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.