Chemical and Physical Changes

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What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

What is an example of a chemical change?

Back

Rusting of a bicycle.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

Dissolving sugar in water.

Front

What indicates a chemical reaction has occurred?

Back

Formation of a gas, color change, temperature change, or formation of a precipitate.

Tags

NGSS.MS-PS1-2

Front

What is the significance of gas formation in a reaction?

Back

It often indicates a chemical change has occurred.

Tags

NGSS.MS-PS1-2

Front

What does the term 'precipitate' mean in chemistry?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Tags

NGSS.MS-PS1-2

Front

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

Back

Chemical changes result in new substances, while physical changes do not.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Front

What is an example of a physical change that can be reversed?

Back

Melting ice.

Tags

NGSS.MS-PS1-4

Front

What is an example of a chemical change that cannot be reversed?

Back

Burning wood.

Tags

NGSS.MS-PS1-5