Determining slow step

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claire ikemiya_2I
Posts: 103
Joined: Wed Sep 30, 2020 9:50 pm

Determining slow step

Postby claire ikemiya_2I » Sat Mar 13, 2021 10:00 pm

How do you guys go a out determining the speed when given various mechanisms.

abby hyman
Posts: 131
Joined: Thu Jul 25, 2019 12:16 am

Re: Determining slow step

Postby abby hyman » Sat Mar 13, 2021 10:04 pm

I think if we were given it on the test they would have to tell you which is the slow step.

If that is not the case then, if you know the overall rate law, you can find the rate law for each step in the mechanism and determine which is the slow step because it will match the overall.
Sometimes we are required to do the equilibrium approach then to substitute for the intermediate if there is one.

Kyle Walsh 2J
Posts: 100
Joined: Wed Sep 30, 2020 9:48 pm

Re: Determining slow step

Postby Kyle Walsh 2J » Sat Mar 13, 2021 10:08 pm

Hi! In all of the examples given in the textbook, I believe that it was identified for us, but it can also be found manually if you have the overall rate law of the reaction. In that case, you'd just have to calculate the rate laws of each step individually and then see which one matches up. Hope this helps!

Britney Tran IJ
Posts: 103
Joined: Fri Aug 30, 2019 12:18 am

Re: Determining slow step

Postby Britney Tran IJ » Sat Mar 13, 2021 10:54 pm

generally the question will tell us but you can also determine the rate law for each step to see which one is the slowest

Jeremy Wei 2C
Posts: 103
Joined: Wed Sep 30, 2020 9:59 pm

Re: Determining slow step

Postby Jeremy Wei 2C » Sun Mar 14, 2021 4:31 am

I think normally they would tell you the slow step, but if not you can calculate each step's reaction rate and compare to determine the slow step and its rate.

Rachael Cohen 3G
Posts: 53
Joined: Sun Dec 13, 2020 12:17 am

Re: Determining slow step

Postby Rachael Cohen 3G » Sun Mar 14, 2021 8:45 am

I think for the sake of this class they will always tell us which step is the slow step.


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