Activation Energy

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ian_haliburton_1f
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

Activation Energy

Postby ian_haliburton_1f » Fri Mar 01, 2019 2:17 pm

Is there an easy way to tell when a chemical reaction has too high of an activation barrier to be kinetically spontaneous even though it is already known to be thermodynamically spontaneous?

Nicole Elhosni 2I
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: Activation Energy

Postby Nicole Elhosni 2I » Sat Mar 02, 2019 1:13 pm

From the example Dr. Lavelle went over in class, diamond to graphite with a ΔG of -3, we know that graphite is thermodynamically stable compared to diamond. Because he told us the reaction occurred slowly, that meant the activation energy was too high to be kinetically spontaneous.

Anushi Patel 1J
Posts: 61
Joined: Fri Sep 28, 2018 12:19 am
Been upvoted: 1 time

Re: Activation Energy

Postby Anushi Patel 1J » Sat Mar 02, 2019 2:49 pm

I think with the example of diamond to graphite, since we know from experience that diamonds don't spontaneously convert to graphite, we can assume that the activation energy is too high for it to be kinetically spontaneous. However, unless it is another example that we would easily know, I don't think we would be asked to determine that without being given the activation energy of the reaction.


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