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29 June, 11:33

What is an indication a chemical reaction has occurred?

A.) Formation of gas

B.) Boiling of a substance

C.) Melting of a substance

D.) Freezing of a substance

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  1. 29 June, 12:28
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    I believe the answer is A. Formation of gas. I found this answer by eliminating the rest because they only clearly show physical changes in the substance. So, I assumed the substance forming a gas would be due to a chemical change.
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