AP Chemistry Question of the Day --44

Welcome back to my blog. Here comes the answer to question 43 I posted earlier. The correct answer is C. 

The potential energy of the products are higher than that of the reactants. The forward reaction is endothermic. When temperature is increased, the forward reaction is favoured and the equilibrium shifts to the right.

Activation energy for any reaction is positive. It is defined as the minimum energy required for a effective collision to happen. A is not correct.

Starting with reactants only, the forward reaction rate will decrease with the decrease in reactant concentration and the backward reaction rate will increase with the concentrate of the product increasing. When both rate are equal, the reaction reaches equilibrium. B is not right.

The potential energy of the products are higher than that of the reactants. The activation energy for the forward reaction is higher than that of the reverse reaction. D is not right.

The potential energy of the products are higher than that of the reactants. The forward reaction is endothermic. The enthalpy change for the forward reaction is positive. E is incorrect.

Following is Question 44 of the series. 

44. Suppose that conversion of reactant R to product P involves the following sequence of reversible reactions. When the system reaches a state of dynamic equilibrium, which of the following statements is true? 

A The rate of step R → Q is equal to the rate of step Q → P. 
B [R] = [Q] = [P] 
C [Q] = [P] / [R] 
D The rate of step Q → R is equal to the rate of step Q → P. 
E The rate of step R → Q is equal to the rate of step Q → R. 

I will post the answer and explanation tomorrow. 

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