How is a chemical change different from a phycsical change ?
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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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chemical change- new substances are formed
it is irreversible
physical change- no new substances are formed
it is reversible
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