fast step before slow step


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marcus lin 1E
Posts: 54
Joined: Fri Sep 28, 2018 12:28 am

fast step before slow step

Postby marcus lin 1E » Sun Mar 17, 2019 9:12 am

Why do we have to assume that the slow step comes after the fast step?

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: fast step before slow step

Postby Matthew Tran 1H » Sun Mar 17, 2019 9:21 am

This is not a general assumption. It's most likely that we will be given whether a step is slow or fast. Fast step before the slow step is a condition that must be met in order to do the pre-equilbrium approach. If the slow step is the first step, then it is the rate determining step and its rate law is the overall rate law.

Briana Lopez 4K
Posts: 44
Joined: Wed Nov 22, 2017 3:01 am

Re: fast step before slow step

Postby Briana Lopez 4K » Sun Mar 17, 2019 9:45 am

The slow step requires more energy for the reaction to achieve, and in turn, more time which is why it is the rate-determining step


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