what is chemical reactions and physical reaction
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Physical Change - Chemistry LibreTexts The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
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reaction in which no new substance are formed and they are reversible are called physical changes
reaction in which the new substance are formed and they are irreversible are called chemical changes
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