## Catalyst and Intermediate

$K = \frac{k_{forward}}{k_{reverse}}$

Melodie Oh 2A
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

### Catalyst and Intermediate

How do you know the difference between a catalyst and in intermediate in a reaction mechanism??

Posts: 57
Joined: Fri Sep 29, 2017 7:04 am

### Re: Catalyst and Intermediate

A catalyst will be used up in a step in the reaction mechanism but gets produced again in a different step. An intermediate gets produced in a step of a mechanism but gets consumed in another. Also, a catalyst can be included in the overall rate law, while an intermediate cannot.

Lily Sperling 1E
Posts: 49
Joined: Tue Oct 10, 2017 7:14 am

### Re: Catalyst and Intermediate

A catalyst is added to the reaction first appears as a reactant, and then as a product. An intermediate is created from a reaction, so it first appears as a product, and then as a reactant.

Michelle Lee 2E
Posts: 64
Joined: Thu Jul 27, 2017 3:01 am

### Re: Catalyst and Intermediate

If you see the same molecule, first as a product and then used up in as a reactant, that's an intermediate.
If you see the same molecule first as a reactant and then rejuvenated as a product later on, that's a catalyst.

Ya Gao
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

### Re: Catalyst and Intermediate

If a molecule is produced and consumed in the next step, it's an intermediate.
If a molecule appears on the reactant side and the product side, it's a catalyst.

Phillip Tran
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

### Re: Catalyst and Intermediate

catalysts are usually in the reactants of the first step and the products of the second step. Intermediates is the other way around

Ridhi Ravichandran 1E
Posts: 35
Joined: Sat Jul 22, 2017 3:01 am

### Re: Catalyst and Intermediate

A catalyst and intermediate are both species that are consumed in the reaction, but a catalyst is present in the beginning of the reaction and an intermediate is formed at the end of a step.

DamianW
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

### Re: Catalyst and Intermediate

a catalyst appears first as a reactant?