transition-state

transition-state - kinetic vs potential energy diagrams...

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kinetic vs. potential energy diagrams Recall the Maxwell-Boltzman distribution (i.e. kinetic energy diagram) Kinetic energy Fraction o molecules Ea The Ea is a critical point. To examine it more closely we can use a potential energy graph Potential Energy (Ep) Path of reaction The axes are not the same, thus the Ep graph is not a blow up of the Ek graph; however it does correspond to the part of the Ek graph that is circled
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potential energy graph: a closer look Collision begins molecules speed up Ep , Ek Activated complex / transition state Reactant s Products Ep (Potential energy stored in chemical bonds) Path of reaction Collision ends molecule s slow down Ep , Ek A 2 2 rush togeth er 2AB molecule s float apart Overall Ep(reactants)>Ep(products) Ep + Ek =constant Ea H
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Forward and reverse reactions are possible Ea is the difference between Ep at transition state and initial or final Ep 2200 H is the difference between initial and final Ep. It is -ve for exothermic,+ve for endothermic Ep Exother mic Endother mic Ea forwa
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transition-state - kinetic vs potential energy diagrams...

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