Catalyst vs Intermedaite

Arrhenius Equation:

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Andrew Nguyen 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:07 am

Catalyst vs Intermedaite

Postby Andrew Nguyen 2I » Tue Mar 13, 2018 4:38 pm

How do you distinguish between a catalyst and intermediate given reaction mechanisms? Can someone give an example with both also?

Ju-Wei Wang 1I
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

Re: Catalyst vs Intermedaite

Postby Ju-Wei Wang 1I » Tue Mar 13, 2018 5:02 pm

A catalyst is present as a reactant in the first step of a given reaction mechanism and is not consumed in the reaction. An intermediate is a species that plays a role in a reaction but does not appear in the chemical equation for the overall reaction; it is produced in one step but is used up in a later step.

In the example that we did in class:

NO(g) + (1/2)O2(g) → NO2(g)
NO2 → NO(g) + O(g)
O2(g) + O(g) → O3(g)

NO is the catalyst and NO2 and O are the intermediates (get used up in the reaction)

Wayland Leung
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

Re: Catalyst vs Intermedaite

Postby Wayland Leung » Tue Mar 13, 2018 5:04 pm

Do we put catalysts in the overall rate law or do we leave them out just like we leave intermediates out of the rate law?

Riya Pathare 2E
Posts: 74
Joined: Sat Jul 22, 2017 3:01 am
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Re: Catalyst vs Intermedaite

Postby Riya Pathare 2E » Tue Mar 13, 2018 5:35 pm

We leave the catalysts out of the rate laws because they only change the activation energy and have no other role in creating the products.


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