Reactions proceed from reactants to products following a rate law that must be e

Question

Reactions proceed from reactants to products following a rate law that must be experimentally determined and with a particular rate constant that is also experimentally determined. The rate of the forward reaction, as you have discovered, will slow as a reaction proceeds. For most reactions the opposite, reverse reaction will occur as products buildup and convert back into reactants. The reverse reaction usually starts at slower rate than the forward reaction. At some point in the process, the rate of the forward reaction will slow and the reverse reaction will speed up until the rates are equal (Ratef = Rater).

What will happen to the concentration of each reactant and product when the rates of the forward reaction and reverse reaction are equal?

A) The concentrations of the reactants will continue to fall and the products will continue to increase even though the forward and reverse reaction rates are equal.

B) The concentrations of the reactants and the products will stop changing when the forward and reverse reaction rates are equal.

C) The concentrations of the reactants will begin to increase and the products will begin to fall because the forward and reverse reaction rates are equal.

D) None of the other answers are applicable.

A) The concentrations of the reactants will continue to fall and the products will continue to increase even though the forward and reverse reaction rates are equal.

B) The concentrations of the reactants and the products will stop changing when the forward and reverse reaction rates are equal.

C) The concentrations of the reactants will begin to increase and the products will begin to fall because the forward and reverse reaction rates are equal.

D) None of the other answers are applicable.

Explanation / Answer

When the rates of forward and backward reaction are equal you have a dynamic EQUILBIRUM

This means, that the production rate = reaction rates

When this is true, the concentrations cease to change, you have a quasi-static equilibrium

Then it must be "B" the answe:

B) The concentrations of the reactants and the products will stop changing when the forward and reverse reaction rates are equal.

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