How does kinetics control a rxn vs thermodynamics?

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Achang1L
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How does kinetics control a rxn vs thermodynamics?

Postby Achang1L » Fri Mar 10, 2017 12:24 pm

My understanding of kinetic control over a reaction occurs because of the difference in energies of activation, where if the products have a lower activation energy than the reactants, it is favored. Is this correct?

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Re: How does kinetics control a rxn vs thermodynamics?

Postby Chem_Mod » Fri Mar 10, 2017 4:50 pm

That is still thermodynamic control. Using the Arrhenius equation, you can see how they differ. When activation energy decreases (say you added a catalyst), the exponential term decreases which makes k larger and thus your reaction gets faster. If instead you raise the temperature, you are also decrease the exponential term so k gets smaller. Both methods result in a faster reaction, but the first is thermodynamic and the second is kinetic.


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