Chemical and Physical Changes

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

List three signs of a chemical change.

Back

1. Color change 2. Gas production 3. Formation of a precipitate.

Front

What is an example of a chemical change?

Back

Gasoline burns in a car engine.

Front

What is an example of a physical change?

Back

Water freezes to form ice.

Front

What does it mean if a substance loses transparency?

Back

It may indicate a physical change, but it is NOT a sign of a chemical change.

Front

What happens during a chemical reaction?

Back

Atoms rearrange to form new substances.

Front

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

Back

Chemical changes result in new substances; physical changes do not.

Front

What is the significance of gas formation in a reaction?

Back

It is a common indicator of a chemical change.

Front

What is a precipitate?

Back

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