Label the reaction profiles below as exothermic or endothermic and use them to calculate the activation energy of the forward and reverse reactions and the value of AH for the reaction. This is a reaction of profile of an 250 exothermic/endothermic reaction 200 PE (kJ) 150 Eaf = 100 Ea, = 50 AH = Reaction pathway 100 This is a reaction of profile of an 80 exothermic/endothermic reaction PE 60 (kJ) A+B 40 Eaf = C+D 20 Ear = ΔΗΞ Progress of the reaction

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