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Postby AlexNguyen15 » Mon Feb 22, 2016 1:12 pm

Why are reactants in a pseudo-equilibrium able to go in the forward and reverse direction?

Chloe 3D
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Re: Psuedo-thermodynamics

Postby Chloe 3D » Mon Feb 22, 2016 5:14 pm

I'm not sure if this is what you mean, but I believe your question refers to page 89 in the course reader.

It considers the reaction A + B ⇄ AB‡ ⇄ C in which reactants A and B are in pseudo-equilibrium with the activated complex of A and B, AB‡.

The constant, K1‡ = [AB‡]/[A][B].

To understand why the reactants A and B can go in both the forward and reverse direction, I picture the energy profile. If A and B collide with sufficient energy they will overcome the energy barrier (Ea) and form AB‡. If A and B collide, however, without enough energy, they will begin to travel up the energy barrier only to return to A and B.

nickgonzalez 1j
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Re: Psuedo-thermodynamics

Postby nickgonzalez 1j » Tue Feb 23, 2016 9:41 pm

The reactants go in the forward direction as a certain degree of energy is supplied as activation energy, however the amount supplied is not enough to go over the energy barrier so since it can not go over the energy barrier, the reactants must return in reverse direction to where they started.

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