1) The following equation represents a gaseous reaction that takes place in a sealed container.

a. Write the equilibrium expression for this reaction.
b. State the units for this equilibrium expression.

Solution

c. The temperature of the reaction system is increased and a new equilibrium is established.

i. How does the increase in the temperature affect the value of the equilibrium constant? Justify your answer. 4 marks

Solution

ii. Compare the rate of the forward reaction at the original equilibrium with the rate of the forward reaction at the new equilibrium after the increase in temperature. Explain the difference using collision theory.
3 marks

Solution

2) The concentration versus time graph for a different reaction is shown below.

This reaction takes place with a catalyst. Equilibrium is reached at time t1 . The reaction is repeated without a catalyst. On the concentration versus time graph above, sketch the expected curve for the products when the reaction is performed without a catalyst.

Solution