89.5 Arrhenius equation 9.5.5 E and energy change of reaction E For a strong endothermic reaction, the Up activation energy for backward reaction is very E sm What about ea + U Problems with this explanation: (1) Do the molecules possess the same When e <e.Au>0. the reaction is a energy endothermic one (2)What kind of energy is the activation energU = Ea,+ − Ea,− When Ea,-< Ea,+, U > 0, the reaction is a endothermic one. For a strong endothermic reaction, the activation energy for backward reaction is very small. What about Ea, +? Problems with this explanation: (1) Do the molecules possess the same energy? (2) What kind of energy is the activation energy? 9.5.5 Ea and energy change of reaction §9.5 Arrhenius equation