• Exothermic reactions: lose energy and involve bonds breaking; ΔH is negative
• Endothermic reactions: gain energy and involve bonds forming; ΔH is positive
Identify each process as endothermic or exothermic and indicate the sign of ΔH.
(a) an ice cube melting
(b) nail polish remover quickly evaporating after it is accidentally spilled on the skin
(c) gasoline burning within the cylinder of an automobile engine
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