Chemical and Physical Changes

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Physical change definition

Back

A change in which no new substances are formed, such as freezing and boiling.

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Chemical change definition

Back

A change in which new substances are formed, involving a chemical reaction.

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Examples of physical changes

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Freezing and boiling.

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Reactants

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Substances that react with each other in a chemical change.

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Products

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New substances formed as a result of a chemical change.

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Chemical change group 2

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Reactions where a substance breaks down into two or more new substances.

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Example of chemical combination

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Carbon burns in oxygen to form carbon dioxide.

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Dissolving table salt in water

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Dissolving table salt in water is a physical change because no new substance is formed, and the process is reversible.

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Learning point: Metal sphere

Back

A metal sphere being heated is considered a physical change.

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Learning point: Water droplets

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Water droplets appearing on the underside of a lid covering hot soup is a physical change.