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Activation Energy

Posted: Sat Mar 16, 2019 1:36 am
by Lasya Gudipudi 1A
How can you tell whether a reaction is exothermic or endothermic based on activation energies for the forward and the reverse reaction, such as the homework problem 15.65 in the sixth edition?

Re: Activation Energy

Posted: Sat Mar 16, 2019 9:02 am
by Nikki Bych 1I
You can tell if you are given both of the activation energies. If the forward rxn Ae is greater than the reverse rxn Ae, then it is endothermic, because the reverse reaction takes less energy to occur. If the reverse rxn Ae is greater than the forward rxn Ae, then it is exothermic, because the forward rxn takes less energy to occur.

Re: Activation Energy

Posted: Sat Mar 16, 2019 10:03 am
by taryn_baldus2E
When comparing the two the endothermic reaction Ae will be higher, than that of an exothermic reaction. If you look up graphs of the progress reaction and reference the different lengths of the activation energy I think it will be more clear to you as of why.