Reaction Profile

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Cindy Chen_2I
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Joined: Wed Nov 18, 2015 3:00 am

Reaction Profile

Postby Cindy Chen_2I » Mon Feb 22, 2016 11:02 pm

Could someone list out the differences between reaction profiles when they have 1) potential energy 2) standard enthalpy and 3) Gibbs free energy as their Y-axis?

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Re: Reaction Profile

Postby Chem_Mod » Tue Feb 23, 2016 1:10 am

Using potential energy as the y-axis results in the largest values for energy differences (like activation energy) since the potential energy is related to total work. Next is Gibbs free energy, which is only the non-expansion work and therefore slightly smaller values than potential energy. Enthalpy will get the smallest value for activation energy, since G=H-TS but the change in S for activating a reaction is negative (to collide in a certain orientation is a high amount of order).

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