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.

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Can physical changes be reversed?

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

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

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Can chemical changes be easily reversed?

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No, chemical changes are usually not easily reversible.

Front

What is an example of a physical change that does not involve a change of state?

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An example of a physical change that does not involve a change of state is cutting paper.

Front

What is an example of a chemical change?

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An example of a chemical change is a penny tarnishing.

Front

What is the best method to separate a mixture of sugar, sand, and water?

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The best method is to filter the sand from the sugar and water, then heat the mixture to evaporate the water.

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What happens to the chemical composition of a substance during a physical change?

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The chemical composition of a substance remains unchanged during a physical change.

Front

What happens to the chemical composition of a substance during a chemical change?

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The chemical composition of a substance changes during a chemical change, resulting in new substances.

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What is an example of a change of state of matter?

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An example of a change of state of matter is ice melting into water.