• Exothermic reactions: lose energy and involve bonds forming; ΔH is negative
• Endothermic reactions: gain energy and involve bonds breaking; ΔH is positive
You may want to reference (Pages 267 - 270) Section 6.6 while completing this problem.
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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