what change is represented by a chemical reaction
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in chemicals reactions the molecules in the reactent interact to form new substance
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we can say that a chemical reaction has taken place when it :-
i) changes its state .
ii)evolution of gas .
iii)change its temperature .
iv)change its colour .
i) changes its state .
ii)evolution of gas .
iii)change its temperature .
iv)change its colour .
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