Kinetics vs. Thermodynamics

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Kinetics vs. Thermodynamics

Postby YINMEICHAN_3F » Mon Feb 27, 2017 10:02 pm

What is the difference, conceptually, between kinetically favorable and thermodynamically favorable?

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Re: Kinetics vs. Thermodynamics

Postby Tiffany_Hoang_3C » Mon Feb 27, 2017 10:14 pm

Thermodynamic analysis tells us if the forward or reverse process if favored (but does not tell us how fast the reaction is). Kinetic analysis tells us the speed or rate of a reaction.

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Re: Kinetics vs. Thermodynamics

Postby tasmia_amjad_3K » Mon Feb 27, 2017 10:38 pm

Think of it this way, graphite and diamond are both made of carbon, and graphite has a lower free energy, so diamond wants to convert into graphite. However, although the reaction should proceed this way (the product(graphite) is more stable that the reactant(diamond) ), it doesn’t. The reaction described is thermodynamically favorable (negative deltaG). But it is also a very slow reaction. It is not possible for the diamond to break all of its bond and form new bonds to make graphite. This is because the activation energy needed by diamond to reform its bonds into the form of graphite is too high. Therefore, this reaction is thermodynamically favorable but kinetically unfavorable.

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Re: Kinetics vs. Thermodynamics

Postby EmmaSaid3C » Tue Feb 28, 2017 2:08 pm

Thermodynamic favorability is a function of the change in free energy (ΔG), while kinetic favorability deals with the things that impact the rate at which a reaction occurs.

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