Presence of a Catalyst

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Presence of a Catalyst

Postby Matt_Coopersmith_4H » Fri Feb 17, 2017 7:19 pm

How do you write the rate law reaction when a catalyst is present? After finding the rate law reaction, do you include the catalyst into calculations to find k, the rate, or various concentrations? Thanks!

Mihika Sridhar 3H
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Joined: Wed Sep 21, 2016 2:58 pm

Re: Presence of a Catalyst

Postby Mihika Sridhar 3H » Fri Feb 17, 2017 9:41 pm

hi matt! Step by step reactions with catalysts look like this (the catalyst cancels out in the final balanced equation):
Step 1: A + Cat. --> Int.
Step 2: Int. + B --> D + Cat.
Final: A + B --> D

when a catalyst is added, the energies of R and P are unaffected, only the activation energy (Ea) is affected, so the value of k (Arrhenius equation: k = A*e(-Ea/R*T)) and the overall rate equation would change

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