How to determine slow step?

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ELu 1J
Posts: 51
Joined: Thu Jul 25, 2019 12:16 am

How to determine slow step?

Postby ELu 1J » Mon Mar 09, 2020 10:50 pm

How do you know if a step is slow or fast in a reaction mechanism?

JohnWalkiewicz2J
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am
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Re: How to determine slow step?

Postby JohnWalkiewicz2J » Mon Mar 09, 2020 10:52 pm

Typically, the problem will tell you if it is aslow or fast step, at least the problems in the textbook do : )

EthanPham_1G
Posts: 104
Joined: Sat Jul 20, 2019 12:17 am

Re: How to determine slow step?

Postby EthanPham_1G » Mon Mar 09, 2020 11:07 pm

Since the slow step determines the overall rate of the reaction, then typically if you are given the overall rate of the reaction that is the slow step.

805312064
Posts: 50
Joined: Thu Jul 11, 2019 12:16 am

Re: How to determine slow step?

Postby 805312064 » Mon Mar 09, 2020 11:22 pm

I don't think there is a way to determine it unless the problem tells you

WGaines_2E
Posts: 47
Joined: Mon Nov 18, 2019 12:18 am

Re: How to determine slow step?

Postby WGaines_2E » Tue Mar 10, 2020 8:20 pm

the slow step is typically the given rate of the reaction

005162520
Posts: 101
Joined: Tue Sep 24, 2019 12:17 am

Re: How to determine slow step?

Postby 005162520 » Wed Mar 11, 2020 2:01 am

Why does the slow step determine rate law ?

Max Madrzyk Dis 4G
Posts: 102
Joined: Wed Sep 18, 2019 12:21 am

Re: How to determine slow step?

Postby Max Madrzyk Dis 4G » Wed Mar 11, 2020 7:57 am

I'm pretty sure the problem will have to tell you if the step is fast or slow. All the practice problems I've done so far have specified.

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: How to determine slow step?

Postby Tyler Angtuaco 1G » Wed Mar 11, 2020 8:45 am

The slow step is denoted in the problem. It is also the step whose rate matches the overall rate law.

EthanPham_1G
Posts: 104
Joined: Sat Jul 20, 2019 12:17 am

Re: How to determine slow step?

Postby EthanPham_1G » Wed Mar 11, 2020 11:30 am

005162520 wrote:Why does the slow step determine rate law ?

The slow step determines the overall rate law because the overall rate of the reaction can only be as fast as the slowest step. If that makes sense. It's kind of like how a chain is only as strong as its weakest link. Hope that helps? :)

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

Re: How to determine slow step?

Postby Jessa Maheras 4F » Wed Mar 11, 2020 6:33 pm

EthanPham_1G wrote:
005162520 wrote:Why does the slow step determine rate law ?

The slow step determines the overall rate law because the overall rate of the reaction can only be as fast as the slowest step. If that makes sense. It's kind of like how a chain is only as strong as its weakest link. Hope that helps? :)


That makes lots of sense, thank you! I would add in saying it creates a sort of bottleneck effect


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