write a short note of :
physical and chemical reaction
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In physical reaction there must be change in color , appearance but it is reversible .
in chemical reaction there must be reaction between compounds and it is irreversible in nature .
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Answer: Physical change : When a substance combines with another to form a new substance,and can be changed again is called physical change. Chemical change : When a substance combines with another to form a new substance and cannot be changed again is called chemical change. Eg : Digestion of food,Cooking of food.
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