give difference between physical and chemical 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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Physical Change : Physical changes are the changes that change the physical traits of the substance, without making any change in their internal structure.
Chemical Changes : Chemical change is one that affects the internal structure of the substance, so as to form a new substance.
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