## Catalyst vs. Intermediate

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

Tinisha 1G
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Catalyst vs. Intermediate

Can someone explain how I would differentiate a catalyst from an intermediate in a reaction?

Posts: 60
Joined: Tue Nov 28, 2017 3:02 am

### Re: Catalyst vs. Intermediate

A catalyst is a reactant first in the mechanism and then a product:

C + D ==> E (fast)

E ==> F + D (fast)

D is a catalyst

An intermediate is the opposite; it is a product first and then a reactant afterwards:

A + B ==> C (slow)

C + D ==> E (fast)

C is an intermediate

bonnie_schmitz_1F
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### Re: Catalyst vs. Intermediate

An intermediate is something formed in a reaction and then used up later. A catalyst is present at the beginning of the reaction.

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

### Re: Catalyst vs. Intermediate

A catalyst is involved in the starting of the reaction, while an intermediate joins in later. Both of them are not included in the rate law.

LaurenJuul_1B
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Joined: Fri Sep 28, 2018 12:17 am

### Re: Catalyst vs. Intermediate

an intermediate is formed and then used up in the reaction

a catalyst is there the whole time and is not used up in the reaction

bonnie_schmitz_1F
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### Re: Catalyst vs. Intermediate

Yvonne Du wrote:A catalyst is involved in the starting of the reaction, while an intermediate joins in later. Both of them are not included in the rate law.

Today, my TA said that a catalyst can be included in the rate law. Can someone clarify?

Yvonne Du
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Joined: Fri Sep 28, 2018 12:23 am

### Re: Catalyst vs. Intermediate

bonnie_schmitz_1F wrote:
Yvonne Du wrote:A catalyst is involved in the starting of the reaction, while an intermediate joins in later. Both of them are not included in the rate law.

Today, my TA said that a catalyst can be included in the rate law. Can someone clarify?

Sorry! I made a mistake. Yes it is possible for a catalyst to appear in the rate law, but it is not included in the chemical equation.

805169754
Posts: 61
Joined: Fri Sep 28, 2018 12:19 am

### Re: Catalyst vs. Intermediate

You can find a catalyst in the beginning of the reaction and at the end whereas an intermediate is produced and consumed during the reaction.

Nicholas Le 4H
Posts: 74
Joined: Fri Sep 28, 2018 12:24 am

### Re: Catalyst vs. Intermediate

A catalyst can be found in the beginning of the reaction, while an intermediate is found in the later steps.