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

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Unformatted text preview: kinetic vs. potential energy diagrams Recall the Maxwell-Boltzman distribution (i.e. kinetic energy diagram) Kinetic energy F r a c t i o n o f m o l e c u l e s Ea The Ea is a critical point. To examine it more closely we can use a potential energy graph P o t e n t i a l E n e r g y ( E p ) 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 potential energy graph: a closer look Collision begins molecules speed up Ep , Ek Activated complex / transition state Reactants Products E p ( P o t e n t i a l e n e r g y s t o r e d i n c h e m i c a l b o n d s ) Path of reaction Collision ends molecules slow down Ep , Ek A 2 & B 2 rush together 2AB molecules float apart Overall Ep(reactants)>Ep(products) Ek(reactants)<Ek(products) Ep + Ek =constant throughout Ea H Ep graph: Important points Forward and reverse reactions are possible Ea is the difference between Ep at transition...
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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