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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, altering the identity of the original substance.

Front

Give an example of a physical change.

Back

Melting of 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 is a sign that a chemical reaction has occurred?

Back

Formation of a gas is a sign that a chemical reaction has occurred.

Front

True or False: In a physical change, the makeup of matter is changed.

Back

False. In a physical change, the makeup of matter remains the same.

Front

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

Back

Chemical changes alter the substance's identity; physical changes do not.

Front

What happens to the molecules during a physical change?

Back

The molecules may change their arrangement or state, but their chemical structure remains unchanged.

Front

What happens to the molecules during a chemical change?

Back

The molecules rearrange to form new substances with different chemical properties.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change.