Solution: Based on their descriptions, classify these chemical changes as endothermic or exothermic.

Problem

Based on their descriptions, classify these chemical changes as endothermic or exothermic.

Solution

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


Recall that:

Exothermic reactionslose energy and involve bonds breaking; ΔH is negative

Endothermic reactionsgain energy and involve bonds forming; ΔH is positive


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