Catalyst


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Brandon_Goenawan2O
Posts: 10
Joined: Wed Sep 21, 2016 2:56 pm

Catalyst

Postby Brandon_Goenawan2O » Thu Feb 23, 2017 11:03 pm

Hello,

I am a little uncertain about catalysts and rate laws. I understand they do not alter the rate constant in a zero order reaction as seen in the course reader but do they affect rate laws in higher orders?
Thanks in advance.

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: Catalyst

Postby Chem_Mod » Fri Feb 24, 2017 12:32 am

Yes, catalysts should affect the rate of a reaction. Catalysts speed up the reaction by lowering the activation energy of that reaction. As shown by the Arrhenius equation, lowering the activation energy increases the rate constant, k.

Wenqian_Deng_1L
Posts: 23
Joined: Wed Sep 21, 2016 3:00 pm

Re: Catalyst

Postby Wenqian_Deng_1L » Sun Feb 26, 2017 10:24 pm

Does changing the temperature also affect the catalyst, which then affects the activation energy and the rate constant?

Milan M
Posts: 10
Joined: Tue Nov 10, 2015 3:00 am

Re: Catalyst

Postby Milan M » Sun Feb 26, 2017 10:56 pm

Increasing temperature will increase the rate of reaction with catalysts, but up to a point. At around 40 degrees C, some enzymes will denature and no longer be able to catalyze.


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