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28 January, 14:50

Which Of These Is An Indication that a chemical reaction occurred

A. formation of gas

B. boiling of a substance

c. melting of a substance

d. freezing of a substance

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Answers (2)
  1. 28 January, 16:24
    0
    The answer is A because the other three are physical changes
  2. 28 January, 18:28
    0
    Only A. Formation of a gas indicates a chemical reaction.

    The other three choices are all physical changes.
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