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Good day.
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The topic is about differentiating chemical and physical change.
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Physical change only involves the change in the physical characteristic of the substance.
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Physical characteristic include size, shape, and other properties which are not directly related to the molecular structure of the substance.
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Whereas chemical change involves.
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The change in the chemical identity of the substance.
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So this means the substance turns into a different substance.
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So a chemical change, unlike physical change, involves formation of new substance.
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We have several evidences of chemical change.
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And that includes one, change in color.
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Number two, change in temperature.
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This means that the object may heat up or cool down as a result of chemical change...