Physical and 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

Is a change in color always a sign of a chemical change?

Back

No, a change in color can occur in physical changes as well.

Front

What is one sign of a chemical change?

Back

Formation of a gas.

Front

What happens when fireworks explode?

Back

They release heat, which is a sign of a chemical change.

Front

What indicates a chemical reaction in a glass of water with an antacid?

Back

The formation of bubbles.

Front

What is precipitate?

Back

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

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Rust forming on iron is an example of a chemical change.

Front

What does it mean when a substance dissolves?

Back

Dissolving is a physical change where a substance mixes uniformly with a solvent.