## Catalysts

$V_{0} = \frac{V_{max}[S]}{K_{M} + [S]}; K_{M} = \frac{[E][S]}{[ES]}$

lizzygaines1D
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am

### Catalysts

Do catalysts speed up both the forward and reverse reaction?

lindsay lathrop 2C
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Joined: Sat Jul 22, 2017 3:00 am

### Re: Catalysts

Yes, catalysts speed up both the forward and reverse reactions. This is why the catalyst does not effect the equilibrium composition even though it is changing the rate of the reaction.

Peri Bingham 1G
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Joined: Fri Sep 29, 2017 7:03 am

### Re: Catalysts

Since the catalysts increase the rates of the forward and reverse reactions equally, equilibrium composition is not changed but is just reached faster.

Amanda Wu 2C
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Joined: Sat Jul 22, 2017 3:00 am

### Re: Catalysts

Yes, catalysts increase the rates of the forward and reverse reactions. In turn, both the forward and reverse rate constants, k and k', increase but their ratio, k/k' which equals the equilibrium constant K, remains the same.

Ya Gao
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### Re: Catalysts

Yes, because catalyst lowers the activation energy which works in both the forward and reverse reactions.

Alejandra Rios 1L
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### Re: Catalysts

Yes, a catalyst works to lower activation energy, therefore this corresponds to the rate of both the forward and reverse reactions.

MorganYun1H
Posts: 59
Joined: Thu Jul 13, 2017 3:00 am

### Re: Catalysts

catalysts lower activation energy therefore the forward and reverse rate will both increase.

Danny Elias Dis 1E
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Joined: Fri Sep 28, 2018 12:19 am

### Re: Catalysts

Do catalysts always enter with the reactants of the first elementary step and end with the products in the last elementary step, or can it be the other way around?

haleyervin7
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

### Re: Catalysts

Is there any case where there must be a catalyst for a reaction to occur?

Karan Thaker 2L
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Joined: Fri Sep 28, 2018 12:26 am

### Re: Catalysts

Important to note catalysts lower Ea, through altering and lowering the transition state of the reactants. They can affect orientation to idealize reactants' position for a reaction, or also weaken bonds of reactants to make them easier to break.

805169754
Posts: 61
Joined: Fri Sep 28, 2018 12:19 am

### Re: Catalysts

haleyervin7 wrote:Is there any case where there must be a catalyst for a reaction to occur?

You can think about enzymes, which are considered catalysts, in biological scenarios where they are required for some reactions to occur.

Dong Hyun Lee 4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

### Re: Catalysts

Catalysts increasethe rate of reactions as they lower the activation energy required to pass the transition state.