differene between physical and chemical change
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Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.
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physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes.
A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust
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