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Short reaction times usually suggest kinetic control, and longer reaction times usually suggest thermodynamic reaction control. If a reaction is under thermodynamic control at a certain temp, it will also be under thermodynamic control at a higher temp for the same reaction time. If a reaction is under kinetic control at a certain temp, it will also be under kinetic control at any lower temp for the same reaction time.
Reactions that are carried out quickly (i.e. those with short reaction times) are said to be kinetically controlled while those carried out over longer periods of time are said to be thermodynamically controlled.
reactions that quickly react usually mean that it is controlled more via kinetics, while reactions that are carried out more slowly suggest that they are being controlled more via thermodynamics. this is also the reason why the terms spontaneous and nonspontaneous might be misleading,
annikaying wrote:How can you tell whether kinetics or thermodynamics controls a reaction?
For the reactions that are spontaneous but slow, I believe that kinetics control the reaction more. For reactions that are spontaneous but fast, I believe that thermodynamics control the reaction more. For reactions that are not spontaneous, they are defined more by thermodynamics.
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