(a)[4]
Complete the reaction pathway diagram in Fig. 4.1 for this reaction. Your diagram should show: the position and the formulae of the products; an arrow, labelled $E_a$, to indicate the activation energy; an arrow, labelled $\Delta H$, to indicate the enthalpy change of the reaction.
(b)[4]
Calculate the bond energy of S=O in kJ/mol.
(c)[5]
State the effect, if any, on the equilibrium position when each of the changes below is made. Give a reason for every answer. The temperature is increased. The pressure is increased. A catalyst is added.
(d)[3]
Explain, in terms of collision theory, why a decrease in temperature lowers the rate of the reverse reaction.