Understanding Physical and Chemical Changes

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Physical change definition

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in form or appearance, no new substance formed

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Chemical change definition

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that forms one or more new substances

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Example of physical change

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of ice

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Example of chemical change

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of iron

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Physical change reversibility

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reversible

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Chemical change reversibility

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irreversible

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Key difference: substance identity

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same substance; Chemical: new substance

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Real-life application of physical change

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paper

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Real-life application of chemical change

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a cake

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When can we say that chemical change has taken place?

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change, gas production, or heat/light released