Kinetic control

[AMahadi]

How does the concept of "kinetic control" or "kinetically controlled reactions" work?

[ShravanPatel2B]

The potential outcome of a reaction is usually influenced by the rate of product formation which are kinetic factors

[Tauhid Islam- 1H]

If a reaction is kinetically controlled, that means generally, the temperature is low so the reaction is not controlled by thermodynamic properties but by the kinetics or by the rate of products that can be formed. On the other hand, if a reaction is thermodynamically controlled, the reaction is controlled by the thermodynamic properties of the reaction, and that generally happens at higher temperatures.

[Owen-Koetters-4I]

the potential outcome can be controlled by the rate of formation of product which is a kinetic factor

[Nicoli Peiris 1B]

It means even if the reaction is thermodynamically unstable or even stable, the reaction will proceed or exist in the form that is not predicted by thermodynamics but is predicted by kinetics.

[Hasan Mirza 3F]

The rate of formation is a kinetic factor that controls the potential outcome.

[Sejal Parsi 3K]

The potential outcome can be controlled by the rate of formation of the product which would be the kinetic factor.

[Chris 1C]

The reaction is controlled by the rate of formation rather than thermodynamics which we learned last quarter.

[Joshua Eidam 2A]

An example that Lavelle gave in lecture was how carbon in the form of a diamond is not as thermodynamically favored as carbon in the form of graphite; however, because of the large energy barrier between the two forms of carbon, the carbon will likely stay in diamond form as becoming graphite would take a long time and would require a lot of energy. This reaction exemplifies kinetic control because it shows how the kinetic properties of the reaction ultimately determine if and how this reaction will occur rather than the thermodynamic properties

[Xavier Herrera 3H]

In the diamond/graphite example that Lavelle gave us, he used the standard deltaG of the reaction from diamond --> Graphite to determine its thermodynamic stability. DeltaG for this reaction is negative, so the forward reaction is favored and Diamond is thermodynamically unstable. However, this reaction is unimaginably slow because there is a massive energy barrier that must be overcome. So even though it's thermodynamically favored, the kinetics wins out and the reaction is controlled by the kinetic stability.

[Ephrem Gerald 2A]

A kinetically controlled reaction means that the reaction could potentially be favorable, but the reaction takes so long to proceed that it does not appear spontaneous. Although it may have a negative Gibbs Free Energy and is considered spontaneous, if it takes for example a month or years to go completion (i.e. diamond going to graphite), we would say that the reaction is kinetically controlled.

[LeanneBagood_2F]

i've seen this mentioned a few times in this thread but what are we referring to when we mentioned potential outcome? and can someone explain a bit more in depth as to how that is controlled by rate of formation?

[Sharon Kim 2A]

The concept of "kinetic control" is saying that the reaction is determined of how fast or slow the reaction is taking place. The difference with thermodynamics is that it analyzes if the reaction is forward/reverse (favorable/not favorable). Kinetically stable reactions occurs when the reaction is very slow and is in higher energy.

[reyvalui_3g]

Reactions can be kinetically controlled by the rate of formation of the product, which is a kinetic factor.

[arisawaters2D]

I remember Dr. Lavelle say that a kinetically controlled reaction means that the reaction should all go to products, but it doesn't because of a large energy barrier. What does this mean?