emilycoprep13 emilycoprep13

06-12-2018
Chemistry

contestada

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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MGTristen MGTristen

23-01-2019

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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