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 dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and cannot be easily reversed. Examples include rusting and burning.

Front

Is dissolving candy a physical or chemical change?

Back

Dissolving candy is a physical change because a new substance is NOT formed, and it can be reversed.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes gas production (fizzing), color change, temperature change, and the formation of a precipitate.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

What happens during a chemical change?

Back

During a chemical change, the substances involved undergo a transformation that results in new substances being formed.

Front

Can physical changes be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.

Front

Can chemical changes be reversed?

Back

Chemical changes are usually not reversible by simple physical means.

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.