Answers
 

Question	Answer	Question	Answer
95	4	99	1
96	4	100	4
97	3	101	5
98	3

 

Important points to remember about equilibria.

1)     Enzymes speed up the rate at which equilibrium is reached.
        They do not affect the position of the equilibrium itself.

2)    Adding reactants will produce an increase in the concentration of products at equilibrium.
        Removing reactants will produce a decrease in the concentration of products at equilibrium.

3)     In the same way, adding products will produce an increase in the concentration of reactants at equilibrium, while removing products will produce a decrease in the concentration of reactants at equilibrium.

4)     At equilibrium, the rates of the forward and backward reactions are equal; there is no net gain or loss of reactants or products. The rate of each reaction is a consequence of the rate constant (eg k₊₁) and the concentration of the reactants for that reaction (eg rate = k₊₁[A][B])

Explanation

Q 95     Removal of one of the reactants, (H⁺), will pull the equilibrium position to the left.
Q 96     Removal of one of the products, (CH₃.CHO), will pull the equilibrium position to the right.
Q 97     Although the rate of the forward and backward reactions are the same at equilibrium, they do not equal zero. There is constant flux through the equilibrium.
Q 98     The two rate constants aren't equal. k₊₁ does not equal k_-1. The rates of forward and backward reations are. ie k₊₁ × [A] = k_-1 ×[B] × [C].
Q 99     The rate = k₊₁ ×[A] × [B]
Q 101   An increase in pH is a decrease in [H⁺].