## Catalysts

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

AlyssaYeh_1B
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Joined: Sat Aug 17, 2019 12:16 am

### Catalysts

How are homogenous catalysts different from heterogeneous catalysts? What's the significance of that difference?

jisulee1C
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Joined: Thu Jul 25, 2019 12:17 am

### Re: Catalysts

a homogenous catalyst is in the same phase or state as the reactants and if it were a homogenous catalyst would absorb being in the same state of matter therefore we wouldn't consider adsorption since there is no contact between substances of different physical states while a heterogeneous catalyst is in a different state from reactants and therefore the reactants sit on the surface of the catalyst which can be thought of as water soaking into a sponge and the reactant breaching the surface of a catalyst

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### Re: Catalysts

With heterogenous catalysts we would have to consider the adsorption and change due to the varying physical states of the substance.

Lauren Stack 1C
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Joined: Sat Aug 17, 2019 12:18 am

### Re: Catalysts

Homogeneous catalysts are the same state as the reactants, while heterogeneous catalysts are in a different state. With heterogeneous catalysts, the reactants sit on the surface of the catalyst.

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Joined: Tue Oct 02, 2018 12:16 am

### Re: Catalysts

Homogeneous are in the same phase and move around the designated volume like it was a reactant or product. When it is a heterogeneous, it is a different phase and the reactants rest on the surface and are adsorbed.

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Joined: Fri Sep 28, 2018 12:28 am

### Re: Catalysts

Madelyn Romberg 1H wrote:Homogeneous are in the same phase and move around the designated volume like it was a reactant or product. When it is a heterogeneous, it is a different phase and the reactants rest on the surface and are adsorbed.

What would this difference mean for the reaction? Like how would a homogeneous/heterogeneous reaction change the processes occurring within the reaction?

Altamash Mahsud 1I
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Joined: Fri Aug 09, 2019 12:16 am

### Re: Catalysts

Homogeneous catalysts are in the same phase as the reactants in the reaction that is going to take place. Heterogeneous catalysts are in a different phase than the reactants in the reaction that is going to take place. The significance of this difference is important when you are considering the mechanism of the catalysis, for a homogeneous catalyst, the catalyst just mixes in with the other reactants (absorption) , while for the heterogeneous catalyst, adsorption occurs, and reactants just sit on the surface of the catalyst.

Julia Holsinger_1A
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### Re: Catalysts

How do you spot a catalyst in a reaction? Or will it always be given?

Norman Dis4C
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Joined: Sat Sep 28, 2019 12:16 am

### Re: Catalysts

Homogenous catalysts are used up and formed, but heterogeneous is not since the reactants and catalysts are in different states.