Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where one or more new substances are formed, often accompanied by energy changes.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a chemical change.

Back

Digesting food is an example of a chemical change.

Front

Give an example of a physical change.

Back

Melting of ice is an example of a physical change.

Front

What is photosynthesis?

Back

A chemical change where plants convert sunlight, water, and carbon dioxide into glucose and oxygen.

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

What happens during a chemical change?

Back

New substances are created, and the original substances can no longer be identified.

Front

What happens during a physical change?

Back

The substance may change its form or appearance, but its chemical identity remains the same.

Front

Is melting wax a chemical or physical change?

Back

Melting wax is an example of a physical change.

Front

What is an example of a physical property?

Back

Color, shape, and melting point are examples of physical properties.