Physical & Chemical 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.

Front

What is a chemical change?

Back

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

Front

Give an example of a physical change that can occur at home.

Back

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

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes the formation of a precipitate, color change, gas production, or temperature change.

Front

What is a precipitate?

Back

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

Front

Which of the following is NOT evidence of a chemical change: color change, gas production, or state of matter change?

Back

A state of matter change is NOT evidence of a chemical change.

Front

What happens to metals during rusting?

Back

Rusting is a chemical change where iron reacts with oxygen and moisture to form iron oxide, a new substance.

Front

What is an example of a chemical change?

Back

Burning wood in a campfire is an example of a chemical change.

Front

How can you differentiate between physical and chemical changes?

Back

Physical changes do not change the substance's chemical identity, while chemical changes do.

Front

What are some common indicators of a chemical change?

Back

Common indicators include color change, temperature change, gas production, and formation of a precipitate.