7 Copper is added to a solution of nitric acid. The solution becomes hot and changes from colorless to dark blue. What is the best explanation for the change in temperature?
A.
The increased volume of the solution causes heat to be released.
B.
The blue color absorbs less energy, which causes heat to be released.
C.
The chemical reaction between the copper and the nitric acid produces heat.
D.
The copper and nitric acid repel each other, which produces heat.
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