8.5E Evidence of Chemical Reactions

Front

What is a chemical change?

Back

A change in which new substances are formed.

Front

What is a precipitate?

Back

A solid that forms when two liquids are mixed.

Front

How does a physical change differ from a chemical change?

Back

Chemical changes produce a new substance, while physical changes do not change the substance itself.

Front

What is an example of a physical change?

Back

Getting a haircut.

Front

What is evidence of a chemical reaction?

Back

Sugar that is burned gives off an odor and turns brown and then black.

Front

What happens during a chemical reaction?

Back

Atoms rearrange to form new substances.

Front

What is the law of conservation of mass?

Back

Matter cannot be created or destroyed in a chemical reaction.

Front

What are some signs of a chemical reaction?

Back

Color change, gas production, temperature change, and formation of a precipitate.

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

What is an example of a chemical change?

Back

Iron rusting.