Page 1 of 1

Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 12:37 pm
by Tinisha 1G
Can someone explain how I would differentiate a catalyst from an intermediate in a reaction?

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 12:47 pm
by Jerome Mercado 2J
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

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 1:08 pm
by bonnie_schmitz_1F
An intermediate is something formed in a reaction and then used up later. A catalyst is present at the beginning of the reaction.

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 1:21 pm
by Yvonne Du
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.

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 2:17 pm
by LaurenJuul_1B
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

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 8:13 pm
by bonnie_schmitz_1F
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?

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 10:18 pm
by Yvonne Du
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.

Re: Catalyst vs. Intermediate

Posted: Wed Mar 13, 2019 10:55 pm
by 805169754
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.

Re: Catalyst vs. Intermediate

Posted: Thu Mar 14, 2019 1:34 pm
by Nicholas Le 4H
A catalyst can be found in the beginning of the reaction, while an intermediate is found in the later steps.