Activation Energy

Arrhenius Equation:

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KeiannaPineda1B
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Activation Energy

Postby KeiannaPineda1B » Fri Mar 13, 2020 7:06 pm

What is the difference between activation energy and free energy of activation?

Diana A 2L
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Re: Activation Energy

Postby Diana A 2L » Fri Mar 13, 2020 7:34 pm

Free energy of activation is Gibbs free energy. This is referred to in terms of the energy barrier of a chemical reaction. Activation energy is the energy needed to surpass the barrier of the transition steps of a reaction.

The energy of activation is also the difference in energy between the (transition state and reactants) and the transition state and the intermediates.

Refer to the diagram attached. The delta Gc is the free activation energy for the catalyzed reaction.
281048D9-55EF-4822-A13F-9CB768655382.png


HERES A BETTER DIAGRAM that makes a clearer distinction:
56125129-7573-469F-8EF8-318C0CEAA64C.png



Hope that helps!

Madelyn Romberg 1H
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Joined: Tue Oct 02, 2018 12:16 am

Re: Activation Energy

Postby Madelyn Romberg 1H » Sat Mar 14, 2020 10:36 am

Does this mean that free energy of activation measured without the enzyme? Or is it needed in relation to the activation energy with the enzyme?

Diana A 2L
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Re: Activation Energy

Postby Diana A 2L » Mon Mar 16, 2020 12:48 am

Madelyn Romberg 1H wrote:Does this mean that free energy of activation measured without the enzyme? Or is it needed in relation to the activation energy with the enzyme?


Not exactly. It means that the free energy of activation is the, let's say, "left over" energy of activation in addition to the activation energy measured with the enzyme. Basically, the addition of the energy of activation measured WITH the enzyme and the energy of activation measured without the enzyme gives you the total energy of activation to get from the reactants to the transition state (which is the really high slope in the chart). I hope this offers SOME clarity, I know it's a bit confusing.


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