(a)[2]
What do the following terms mean? catalyst; homogeneous.
(b(i))
State a major source of nitrogen oxides in the atmosphere and explain how they are formed.
(b(ii))[5]
Use equations to show the chemical part played by nitrogen oxides in the formation of acid rain.
(c)[3]
Using the axes below, draw a fully labelled reaction pathway diagram to show the effect of a catalyst on an exothermic reaction. Label the $\Delta H$ and $E_a$ values.