Activation Energy Temperature Dependence

Arrhenius Equation:

Moderators: Chem_Mod, Chem_Admin

Sirajbir Sodhi 2K
Posts: 47
Joined: Sat Jul 22, 2017 3:00 am

Activation Energy Temperature Dependence

Postby Sirajbir Sodhi 2K » Mon Mar 12, 2018 11:22 am

Why is activation energy independent of temperature? I would think that it would decrease as temperature increases because of the increased rate of collisions?

lindsay lathrop 2C
Posts: 29
Joined: Sat Jul 22, 2017 3:00 am

Re: Activation Energy Temperature Dependence

Postby lindsay lathrop 2C » Mon Mar 12, 2018 12:40 pm

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.

lindsay lathrop 2C
Posts: 29
Joined: Sat Jul 22, 2017 3:00 am

Re: Activation Energy Temperature Dependence

Postby lindsay lathrop 2C » Mon Mar 12, 2018 12:45 pm

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"

Christy Lee 2H
Posts: 73
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: Activation Energy Temperature Dependence

Postby Christy Lee 2H » Mon Mar 12, 2018 2:09 pm

Does what you described have to do with the frequency factor at all?

Akash_Kapoor_1L
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am
Been upvoted: 1 time

Re: Activation Energy Temperature Dependence

Postby Akash_Kapoor_1L » Sun Mar 18, 2018 10:37 am

I'm pretty certain that the variable A is also defined as the frequency factor.

Sirajbir Sodhi 2K
Posts: 47
Joined: Sat Jul 22, 2017 3:00 am

Re: Activation Energy Temperature Dependence

Postby Sirajbir Sodhi 2K » Sun Mar 18, 2018 11:47 pm

I think it does have to do with the frequency factor more than the activativation energy -- thank you.


Return to “Arrhenius Equation, Activation Energies, Catalysts”

Who is online

Users browsing this forum: No registered users and 3 guests