(a(i))[2]
Sketch on Fig. 3.1 the curve shape for the same sample of $\text{H}_2(g)$ molecules after the temperature is raised.
(a(ii))[2]
Explain why increasing the temperature raises the rate of reaction 1.
(a(iii))[1]
State the function of nickel when it is added to reaction 1.
(a(iv))[1]
Annotate Fig. 3.2 so that it shows the effect of adding nickel to reaction 1 at temperature $T$.
(b)[2]
Define Le Chatelier’s principle in your own words.
(c)[2]
Reaction 2 is the equilibrium reaction between $X(g)$ and $Y(g)$ that forms $Z(g)$ in a sealed container. reaction 2: $aX(g) + bY(g) \rightleftharpoons cZ(g)$ Fig. 3.3 shows how the percentage yield of $Z(g)$ changes with pressure at two temperatures, 300 K and 350 K. Deduce two conclusions about reaction 2 from Fig. 3.3.