activation energy  [ENDORSED]

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Ryan Neis 2L
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

activation energy

Postby Ryan Neis 2L » Thu Mar 08, 2018 6:06 pm

Does activation energy play a role in determining whether or not a reaction is controlled through kinetics or thermodynamics? If so, how?

Sohini Halder 1G
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Joined: Thu Jul 13, 2017 3:00 am
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Re: activation energy

Postby Sohini Halder 1G » Thu Mar 08, 2018 7:45 pm

At lower temperatures, there is usually not enough energy to overcome an activation energy barrier, so the pathway that has the smaller activation energy will be the faster reaction and the one that is observed. This is kinetically determined. This is also different than reactions that are spontaneous, because that is driven by thermodynamics. Spontaneous reactions can still eons and eons to happen.

David Zhou 1L
Posts: 61
Joined: Fri Sep 29, 2017 7:04 am

Re: activation energy

Postby David Zhou 1L » Fri Mar 09, 2018 4:41 pm

Activation energy has to do with kinetics. Thermodynamics is concerned with the difference in internal energy before and after the reaction, which is a different concept, and mathematical value from the activation energy for the same reaction.

Isaiah Little 1A 14B
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Joined: Fri Sep 29, 2017 7:05 am

Re: activation energy  [ENDORSED]

Postby Isaiah Little 1A 14B » Sat Mar 10, 2018 9:48 pm

Activation energy is the main determinant in the kinetic stability of a reaction. For instance, a reaction is kinetically stable if the activation energy is exceedingly high (i.e.; the conversion of carbon (diamond) into carbon (graphite) since said reaction would take a high amount of energy to undergo. Thermodynamic stability refers to whether the reaction is spontaneous or not with regards to the Gibbs free energy of a reaction, not necessarily the activation energy.

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