## Activation Energy

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

Lasya Gudipudi 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Activation Energy

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?

Nikki Bych 1I
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### Re: Activation Energy

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.

taryn_baldus2E
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

### Re: Activation Energy

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.