Elementary steps


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Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Elementary steps

Postby Priscilla Okaiteye » Sat Mar 16, 2019 9:52 pm

For naming the molecularity of elementary steps I know we take the species # into consideration but do we also look at the catalyst? What else is considered?

Srikar_Ramshetty 1K
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Re: Elementary steps

Postby Srikar_Ramshetty 1K » Sat Mar 16, 2019 10:06 pm

The molecularity of a step is all the reactants that are present.

Unimolecular
A -> P (Rate =k[A])

Bimolecular
A+A -> P (Rate =k[A]^2)
A+B -> P (Rate =k[A][B])

Termolecular
A+A+A-> P (Rate =k[A]^3)
A+B+C-> P (Rate =k[A][B][C])

Hope that helps!

Samantha Pacheco 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Elementary steps

Postby Samantha Pacheco 2K » Sat Mar 16, 2019 10:08 pm

For naming molecularity you only consider the reactants taking part in a reaction.

hazelyang2E
Posts: 57
Joined: Fri Sep 28, 2018 12:23 am

Re: Elementary steps

Postby hazelyang2E » Sat Mar 16, 2019 10:56 pm

I believe that you consider the reactants for the molecularity which includes any catalysts but not intermediates.


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