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Which method of testing substances is a sure way to identify a chemical reaction?

Achange in color
Bformation of bubbles
Cchange in density
Dincrease in temperature
Esolubility in water

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Chemical reaction includes chemical changes (modifications in the structures of molecules, new compounds )of the substances in the reaction. As a result of the chemical reaction new substances are formed that cannot be reversed using physical means.

The following method of testing substances is a sure way to identify a chemical reaction:

A. color change

B. Formation of bubbles

D. increase in temperature  

A change in color hope it helps

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