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

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What exactly is the difference between absorption and adsorption? How does adsorption work in relation to catalysts?

Sungyoon_Baek_1A
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I think the difference between adsorption and absorption is that in absorption, substance goes into another substance else while in adsorption, a substance/molecule sits on top of the other. For heterogeneous catalysts I think the importance of adsorption vs. absorption is that the reactants sit on the SURFACE of the catalyst rather than going into the catalyst.

Amanda Wu 2C
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As Lavelle mentioned in class, I think the main difference between absorption and adsorption is that in absorption, a substance goes inside another substance (as in water into a sponge) whereas in adsorption, the reactants just sit on the surface of the catalyst.

Nate O 2L
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What difference does it make when the reactants sit on the surface versus when they go inside?

Swetha Sundaram 1E
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At least from what I understand about it, I think one would just act as a cover whereas the other one would become part of the catalyst?? I'm not sure about this though.

Destiny Diaz 4D
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I think it would matter only in understanding what is happening to the reactant, it would be steeping into the catalyst instead of the catalyst taking in the reactant? I am not sure though

Destiny Diaz 4D
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I feel like as long you understand and can picture the situation when given an adsorption problem you shouldn't have to worry too much.

Joonsoo Kim 4L
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In Adsorption, Dr. Lavelle mentioned that you'd want to maximize the surface area of the catalyst so that more of it is making contact with the reactants. In absorption, that wouldn't really be a problem. I agree with Destiny that it's not something that we need to worry about too much.

alanaarchbold
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Would an adsorption catalyst work differently in an equation? Or should I just know what it is compared to absorption

Joonsoo Kim 4L
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It wouldn't work differently; the chemical equation doesn't include the catalyst since it cancel out anyways.

Salena Chowdri 1I
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Adsorption occurs with a heterogeneous catalyst, it provides a solid surface area for compounds to react.

sophiebillings1E
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It would still appear on either side of the equation as well when it comes to rate laws.

CameronDis2K
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In adsorption, the reactants sit on top of the solution or catalyst, while absorption (as in the class example) is when water is absorbed by a sponge (so completely different meanings and uses in context).

Jamie Lee 1F
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