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. Examples include rusting, burning, and digestion.

Front

Does dissolving salt in water represent a physical or chemical change?

Back

Dissolving salt in water is a physical change because the salt can be recovered by evaporating the water.

Front

What happens to the chemical composition during a physical change?

Back

The chemical composition remains the same during a physical change.

Front

What happens to the chemical composition during a chemical change?

Back

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

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes from liquid to gas without altering its chemical structure.

Front

True or False: A physical change may produce a new substance.

Back

False. A physical change does not produce a new substance.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the rusting of iron.

Front

What is an example of a physical change?

Back

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

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.