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Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Formation of a gas D.Freezing of a substance

Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Formation of a gas D.Freezing of a substance
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Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Formation of a gas D.Freezing of a substance

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User Lorenz Albert
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The answer is formation of gas because melting, boiling, and freezing are only property changes

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User Zackygaurav
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