Physical and Chemical Changes in Matter

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What is a chemical change?

Back

A chemical change is a process where one or more new substances are formed, often involving a change in energy and properties.

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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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Example of a chemical change: Cake batter baked in an oven.

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This is a chemical change because new substances (cake) are formed during baking.

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Example of a chemical change: Wood burned in a fireplace.

Back

This is a chemical change because burning wood creates new substances like ash and smoke.

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Which of the following is NOT a chemical change? Slicing a tomato.

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Slicing a tomato is a physical change because it does not create a new substance.

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What happens during a chemical change?

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

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What happens during a physical change?

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During a physical change, the form of a substance changes, but its chemical identity remains the same.

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Example of a physical change: Shredding a piece of paper.

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Shredding paper is a physical change because the paper's composition remains unchanged.

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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 rust (iron oxide).

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What is melting?

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Melting is a physical change where a solid turns into a liquid without changing its chemical composition.