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Catalysts and the Standard Entropy of Activation

Posted: Mon Mar 09, 2015 3:15 pm
by Glenda Marshall DIS 3M
I know that a catalyst reduces the free energy of activation by weakening bonds and thus lowers the standard enthalpy of activation, but how does it raise the standard entropy of activation? The wording the in the book is confusing to me. Thank you!

Re: Catalysts and the Standard Entropy of Activation

Posted: Mon Mar 09, 2015 7:49 pm
by Chem_Mod
A catalyst may facilitate the correct orientation for a reaction.

Normally a reaction might require reactants to be in an unlikely orientation. The entropy of unlikely states is low. A catalyst can make this orientation more likely, thus increasing entropy.

Re: Catalysts and the Standard Entropy of Activation

Posted: Mon Mar 09, 2015 8:30 pm
by Justin Le 2I
Adding onto Chem_Mod, the increase of entropy is why the free energy of the transition states will always be higher than the free energy of the reactants.