## catalyst

$\frac{d[R]}{dt}=-k; [R]=-kt + [R]_{0}; t_{\frac{1}{2}}=\frac{[R]_{0}}{2k}$

kevinolvera1j
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### catalyst

Are all zero order reactions dependent on a catalyst?

Selena Yu 1H
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### Re: catalyst

No, not all zero order reactions is dependent on a catalyst. A zero order reaction could also occur with an enzyme or a surface. It's just that most commonly you would find a catalyst with a zero order reaction.

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

### Re: catalyst

Selena Yu 1H wrote:No, not all zero order reactions is dependent on a catalyst. A zero order reaction could also occur with an enzyme or a surface. It's just that most commonly you would find a catalyst with a zero order reaction.

Aren't enzymes just biological catalysts?

Diana A 2L
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### Re: catalyst

kevinolvera1j wrote:
Selena Yu 1H wrote:No, not all zero order reactions is dependent on a catalyst. A zero order reaction could also occur with an enzyme or a surface. It's just that most commonly you would find a catalyst with a zero order reaction.

Aren't enzymes just biological catalysts?

AHHH yes they are! Let me provide a better answer.

A zero-order reaction is when rate is just k right, so it doesn’t depend on the concentrations of the reactants.
And a catalyst is not present in the overall chemical reaction, but they’re just there as a pathway of lower activation energy.

Rather, zero-order reactions usually DESCRIBE catalysts, because regardless of how much the concentration of the reactant changes, the rate will be determined by k, or specifically, how much the catalyst can handle basically.

Diana A 2L
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### Re: catalyst

Here’s a link to offer a more detailed explanation!

https://chem.libretexts.org/Core/Physic ... _Reactions

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### Re: catalyst

A zero order reaction can simply be when a material such as the surface or catalyst are saturated by the reactants so no a catalyst isn't necessary to make a reaction zero order. In this type of reaction, the limiting factor is something besides concentration which can possibly be a catalyst, but this is not always the case.