(a)[2]
What does the term equilibrium mean?
(b(i))[1]
Explain why the yield at 500 ^{\circ}C stays unchanged when the pressure is raised.
(b(ii))[2]
What conclusion can you draw from the difference in the yield of hydrogen iodide at the two temperatures shown? Explain your answer.
(c(i))[1]
At what point is the rate of reaction greatest?
(c(ii))[2]
The reaction was done again at the same temperature and pressure, but with a catalyst present. Draw a graph on the same axes to show how the concentration of hydrogen iodide changes with time in the presence of a catalyst.
(d(i))[2]
State and explain the effect of increasing the pressure on the rate of the forward reaction.
(d(ii))[3]
State and explain the effect of increasing the temperature on the rate of the reverse reaction.