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. Examples include melting, freezing, and cutting.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and mixing vinegar with baking soda.

Front

What is a precipitate?

Back

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

Front

What are indicators of a chemical reaction?

Back

Indicators of a chemical reaction include color change, gas production, temperature change, and the formation of a precipitate.

Front

Is cutting a pizza into slices a physical or chemical change?

Back

Cutting a pizza into slices is a physical change.

Front

What happens when two clear liquids are mixed and a blue liquid forms?

Back

This is an example of a chemical change, as a new substance (the blue liquid) is formed.

Front

What is an example of a physical change?

Back

Melting ice into water is an example of a physical change.

Front

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

Back

A physical change does not change the substance's chemical identity, while a chemical change results in new substances being formed.

Front

What is an example of a chemical change?

Back

Iron rusting is an example of a chemical change.

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.