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Cristian Carrasco 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:06 am


Postby Cristian Carrasco 1F » Tue Mar 13, 2018 10:18 pm

How do you draw mechanisms from rate laws?

Lindsay Kester 2L
Posts: 29
Joined: Thu Jul 27, 2017 3:00 am

Re: mechanisms

Postby Lindsay Kester 2L » Tue Mar 13, 2018 10:28 pm

Mechanisms need to support the orders shown in the rate law- so if the rate law says that something is second order, then there should be two molecules used up in the slow step of its elementary reaction. However, mechanisms can only provide possible answers to the rate law, not prove one, and there might be different mechanisms that give the same rate law.

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

Re: mechanisms

Postby Wenxin Fan 1J » Thu Mar 15, 2018 9:39 am

To show the mechanism you just need to write and identify the slow step and ensure thsn the series of steps results in the overall equation and supports the experimentally determined rate law.

David Zhou 1L
Posts: 61
Joined: Fri Sep 29, 2017 7:04 am

Re: mechanisms

Postby David Zhou 1L » Thu Mar 15, 2018 9:12 pm

Rate laws are determined experimentally generally rather than by analyzing the chemical equation, so it's often a difficult task to figure out the specific mechanism for a specific rate law.

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