Chemical and Physical Changes

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture when two liquids are mixed.

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.

Back

Melting ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change.

Front

What happens to the molecules during a physical change?

Back

The molecules rearrange but do not change their chemical structure.

Front

What happens to the molecules during a chemical change?

Back

The molecules break apart and form new molecules with different chemical structures.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can include color change, gas production, or temperature change.

Front

What is an example of a reversible physical change?

Back

Freezing and melting of water is an example of a reversible physical change.