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21 December, 01:10

Which of these is an indication that a chemical reaction has occurred?

A. Melting of a substance

B. A change of color in a substance

C. Boiling of a substance

D. Freezing of a substance

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  1. 21 December, 04:55
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    The following indication that a chemical reaction has occurred would be B. A change in colour in a substance. The other 3 are physical changes.
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