catalysts

Arrhenius Equation:

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Tiffany Cao 1D
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Joined: Fri Sep 29, 2017 7:03 am
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catalysts

Postby Tiffany Cao 1D » Tue Mar 13, 2018 9:59 pm

Can catalysts appear in an overall rate law?

Justin Chang 2K
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

Re: catalysts

Postby Justin Chang 2K » Tue Mar 13, 2018 10:56 pm

I am not completely sure, but I think catalysts can appear in the rate law. If there is more of the catalyst, then it makes sense that the rate would be faster since more catalysts are able to catalyze more reactions and thus the rate is faster.

Sara Sasaki 1K
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Joined: Fri Sep 29, 2017 7:05 am

Re: catalysts

Postby Sara Sasaki 1K » Tue Mar 13, 2018 11:23 pm

Catalysts don't show up when writing the overall reaction, and aren't included in the rate law either. However, they indirectly change the k value of the rate law by lowering the activation energy of the reaction.

YashDeshmukh1D
Posts: 42
Joined: Fri Sep 29, 2017 7:05 am

Re: catalysts

Postby YashDeshmukh1D » Wed Mar 14, 2018 3:34 pm

Wait I thought catalysts could appear in the rate law if they are part of the slow step that determines the overall rate law? I think pages 651 and 652 of the textbook mention this.

Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 3:01 am

Re: catalysts

Postby Dang Lam » Thu Mar 15, 2018 10:57 am

Yes, catalyst can appear in the overall rate law, intermediates are the ones that cannot appear in the overall rate law

Cristina Sarmiento 1E
Posts: 52
Joined: Wed Nov 16, 2016 3:02 am

Re: catalysts

Postby Cristina Sarmiento 1E » Thu Mar 15, 2018 1:29 pm

Catalysts can be appear in the overall rate law, but sometimes they are cancelled out (e.g. consumed in the fast step before and produced in the slow step) and therefore would not appear in the rate law.


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