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 changes the composition of the substance. Examples include rusting, burning, and cooking.

Front

Which of the following is NOT an example of a physical change?

Back

Sour milk is NOT an example of a physical change; it is a chemical change.

Front

When you break a cracker into pieces, what type of change is it?

Back

It is a physical change.

Front

What happens to the chemical composition of a substance during a physical change?

Back

The chemical composition remains the same during a physical change.

Front

What happens to the chemical composition of a substance during a chemical change?

Back

The chemical composition changes during a chemical change, resulting in new 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

Boiling an egg is an example of a chemical change.

Front

What is an indicator of a chemical change?

Back

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

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change.