Intermediates


Moderators: Chem_Mod, Chem_Admin

Ashley McClearnen 1B
Posts: 59
Joined: Fri Sep 28, 2018 12:26 am

Intermediates

Postby Ashley McClearnen 1B » Mon Mar 11, 2019 2:12 pm

Why can there never be an intermediate in a rate law?

emily gao 1C
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: Intermediates

Postby emily gao 1C » Mon Mar 11, 2019 2:14 pm

the general rate law should only have reactants for the reaction as a whole. intermediates aren't found in the general reaction equation because they are created and then used up, so they wouldn't be in the rate law

Rogelio Bazan 1D
Posts: 64
Joined: Tue Nov 14, 2017 3:01 am

Re: Intermediates

Postby Rogelio Bazan 1D » Mon Mar 11, 2019 2:17 pm

The rate law is only composed of the reactants that are in the total reaction. Intermediates cannot be in the rate law as they are not found in the total reaction which is why we get rid of them when doing the general rate law. Hope this helps.

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Intermediates

Postby shouse1f » Mon Mar 11, 2019 5:33 pm

today in lecture it was said that you can never have an intermediate in a rate law

Mindy Kim 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:25 am

Re: Intermediates

Postby Mindy Kim 4C » Mon Mar 11, 2019 6:42 pm

Adding on to this, this is why we can deduce the rate law directly from the coefficients of the reactants in an elementary reaction. We assume there are no intermediates in elementary reactions and so can derive the rate law just by looking at the reaction.

LorenzoDuvergne3I
Posts: 60
Joined: Fri Sep 28, 2018 12:25 am

Re: Intermediates

Postby LorenzoDuvergne3I » Mon Mar 11, 2019 7:19 pm

What else was discussed today? I unfortunately couldn't make it because I was feeling ill.

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Intermediates

Postby shouse1f » Tue Mar 12, 2019 12:08 pm

LorenzoDuvergne3I wrote:What else was discussed today? I unfortunately couldn't make it because I was feeling ill.

The pre-equilibrium approach and the relationship between temperature and reaction rate and activation energy and reaction rate

Cody Do 2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Intermediates

Postby Cody Do 2F » Tue Mar 12, 2019 12:36 pm

LorenzoDuvergne3I wrote:What else was discussed today? I unfortunately couldn't make it because I was feeling ill.


Expanding on the previous comment, as temperature increases, then K increases as well. This is because a higher temperature will increase the amount of collisions between reactants (as well as the energy in each collision). Furthermore, as the Activation Energy increases, then K decreases.

daniella_knight1I
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

Re: Intermediates

Postby daniella_knight1I » Tue Mar 12, 2019 12:48 pm

There are never intermediates in a rate law.


Return to “Reaction Mechanisms, Reaction Profiles”

Who is online

Users browsing this forum: No registered users and 2 guests