Big Idea 9: 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 boiling.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include burning, rusting, and cooking.

Front

What happens to a substance during a physical change?

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

Front

What happens to a substance during a chemical change?

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The substance transforms into one or more new substances with different properties.

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Can a physical change be reversed?

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Yes, many physical changes can be reversed, such as freezing and melting.

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Can a chemical change be reversed?

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Most chemical changes cannot be easily reversed, as they create new substances.

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What is an example of a physical change?

Back

Water boiling is an example of a physical change.

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What is an example of a chemical change?

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Burning wood is an example of a chemical change.

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What is rusting?

Back

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

Front

What is an example of a substance that undergoes a chemical change when heated?

Back

A candle wick burning is an example of a chemical change.