Homework Help: Chemistry

Posted by BlahxD on Monday, April 4, 2011 at 12:10am.

Given the reaction A(g) + B(g) <-> 2AB(g)
1. What does equilibrium mean? -equal mols or pressure between reactants and products? Is there more reactants or products?

2. Will the equilibrium be the same if i started with the reactants only vs if i started with the product only. What are the similarities and differences between starting out with one or the other?

3. Once equilibrium is reach, will there be any changes to system 5 mins after equilibrium, 10 mins after equilibrium?

4. What is actually happening at the molecular level before and after equilibrium? Like do all collisions between A and B make AB? How does AB make A and B again?

Chemistry - DrBob222, Monday, April 4, 2011 at 12:19am
1. Equilibrium is attained in a reaction when products are being formed at the same rate at which reactants are being formed; i.e., the forward reaction occurs at the same rate as the reverse reaction. Equilibrium is a dynamic process which means that the reaction still is taking place but there is no net change in the concns of reactants or products.
2. It makes no difference if you start with reactants or with products; at equilibrium, the concns of reactants and products will be the same no matter which you start with.
3. Forward and reverse reactions occur all the time; there is no NET CHANGE in the concns after equilibrium is attained.
4. Not all collisions between A and B produce AB but only those in which A molecules and B molecules have enough energy to produce a union. AB splits to make A and B.

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