Self Test 4.4 A

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Sue_Park_2D
Posts: 13
Joined: Wed Sep 21, 2016 2:57 pm

Self Test 4.4 A

Postby Sue_Park_2D » Wed Mar 01, 2017 11:57 am

I don't understand why step one would have the larger Ea when the y-axis was labeled potential energy for part c.

Are the reaction profiles different when potential energy v. gibbs free energy is on the y-axis?

Thank you in advance!
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Sarah_Heesacker_3B
Posts: 21
Joined: Wed Sep 21, 2016 2:57 pm

Re: Self Test 4.4 A

Postby Sarah_Heesacker_3B » Wed Mar 01, 2017 12:05 pm

I think that the reaction profile would be the same, but the labels would be different. Step 1 would have a larger activation energy because the activation energy for Step 1 is measured from the reactants to the first transition state (from start of graph to top of first peak). Activation energy for Step 2 would be measured from the intermediates to the second transition state (from trough between two peaks to the top of the second peak), which is a smaller value. Gibbs free energy is measured from the reactants to the transition state, so the value for Step 2 would be greater since the second peak is higher.
Hope this helps.


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