Physical and Chemical Changes Review

Front

What is a chemical change?

Back

A chemical change occurs when one or more substances change into entirely new substances, often involving a chemical reaction.

Front

Give an example of a chemical change.

Back

Roasting a marshmallow over a fire is an example of a chemical change.

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 physical change.

Back

Sharpening a pencil is an example of a physical change.

Front

What happens to the size of an object during a physical change?

Back

A change in the size of an object is a physical change.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change often include fizzing, foaming, color change, heat production, or the formation of a precipitate.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

Front

Can a chemical change be reversed?

Back

Most chemical changes are not easily reversible, unlike many physical changes.

Front

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

Back

Melting ice is a physical change that can be reversed by freezing the water again.

Front

What is a precipitate?

Back

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