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


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.

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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.

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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
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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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