physical and chemical changes

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What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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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.

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NGSS.MS-PS3-4

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Is burning wood a chemical change?

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Yes, burning wood is a chemical change because it transforms the wood into ash, smoke, and gases.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Is cutting a log into small pieces a chemical change?

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No, cutting a log is a physical change because the wood remains the same substance.

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What happens during a chemical change?

Back

During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in new substances.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Is breaking glass a chemical change?

Back

No, breaking glass is a physical change because the glass remains the same substance, just in smaller pieces.

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NGSS.MS-PS1-2

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What is an example of a chemical change?

Back

An example of a chemical change is the reaction of vinegar and baking soda, which produces carbon dioxide gas.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

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

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NGSS.MS-PS1-4

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Does a change in color always indicate a chemical change?

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No, a change in color does not always indicate a chemical change; it can also occur in physical changes.

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NGSS.MS-PS1-2