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Activation Energy Temperature Dependence

Posted: Mon Mar 12, 2018 11:22 am
by Sirajbir Sodhi 2K
Why is activation energy independent of temperature? I would think that it would decrease as temperature increases because of the increased rate of collisions?

Re: Activation Energy Temperature Dependence

Posted: Mon Mar 12, 2018 12:40 pm
by lindsay lathrop 2C
Activation energy is technically the minimum amount of Kinetic Energy needed for a a collision to result in a reaction (according to the collision theory). The higher the temperature the more Kinetic energy is present meaning the higher the likelihood we will reach this level and end up with a reaction as a result of the collision. With a rise of temperature we are climbing the reaction graph approaching the activation barrier, therefore, we are closer to the activation energy but the activation energy has not itself changed.

Re: Activation Energy Temperature Dependence

Posted: Mon Mar 12, 2018 12:45 pm
by lindsay lathrop 2C
Adding on: Although it is mostly independent, what you did point does happen to a certain extent which is why the book states "Both A and Ea are nearly independent"

Re: Activation Energy Temperature Dependence

Posted: Mon Mar 12, 2018 2:09 pm
by Christy Lee 2H
Does what you described have to do with the frequency factor at all?

Re: Activation Energy Temperature Dependence

Posted: Sun Mar 18, 2018 10:37 am
by Akash_Kapoor_1L
I'm pretty certain that the variable A is also defined as the frequency factor.

Re: Activation Energy Temperature Dependence

Posted: Sun Mar 18, 2018 11:47 pm
by Sirajbir Sodhi 2K
I think it does have to do with the frequency factor more than the activativation energy -- thank you.