how do we know a chemical reaction has taken place
Answers
Answered by
57
1)A change that changes state and colour of substance.
2)A change that releases heat energy.
3)A change which forms an insoluble substance as precipitate.
4)A change that liberates a gas.
Answered by
51
If a chemical reaction took place on a object, the object will not be the same as before. ( please mark this answer as brainlist answer, plz)
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