Enzymes in rate law

$V_{0} = \frac{V_{max}[S]}{K_{M} + [S]}; K_{M} = \frac{[E][S]}{[ES]}$

Deborah Cheng 1F
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Enzymes in rate law

I believe Dr. Lavelle mentioned this in class but I just wanted to clarify, catalysts can be in the rate law?

Posts: 57
Joined: Fri Sep 29, 2017 7:04 am

Re: Enzymes in rate law

Yes, because the concentration of catalysts affect the reaction rate, the higher the concentration, the faster the reaction!

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

Re: Enzymes in rate law

Catalysts can be included in the rate law. This occurs when the catalyst is involved in the rate-determining step, since the reactants of the rate-determining step is what decides the overall rate law. However, if the catalyst is involved in a different step, then it will not appear in the rate law.

Deborah Cheng 1F
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Enzymes in rate law

I see, so if the catalysts are not necessarily always going to be in the rate determining step and therefore will not always show up in the rate law?

Wenxin Fan 1J
Posts: 53
Joined: Thu Jul 13, 2017 3:00 am

Re: Enzymes in rate law

In most cases, catalysts will not be included in the rate law since it is not usually involved in the slow, rate determining step.