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Solution: Sort the following reactions as either endothermic or exothermic. Explain your answer briefly.

Problem

Sort the following reactions as either endothermic or exothermic. Explain your answer briefly.

Solution

We’re being asked to classify each given reaction as exothermic or endothermic


Recall that:

Exothermic reactions: lose energy and involve bonds forming; ΔH is negative

Endothermic reactions: gain energy and involve bonds breaking; ΔH is positive


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