We’re being asked to classify each given reaction as exothermic or endothermic.
• Exothermic reactions: lose energy and involve bonds breaking; ΔH is negative
• Endothermic reactions: gain energy and involve bonds forming; ΔH is positive
Identify each of the following processes as endothermic or exothermic and indicate the sign of ∆H.
a) ice cube melting
b) water freezing in a freezer
c) wood burning in a fire
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