(a)[2]
Finish the diagram by adding the correct labels into the boxes.
(b(i))[1]
Which concentration of hydrochloric acid produced the faster initial rate of reaction? Use the graph to justify your answer.
(b(ii))[2]
Draw a curve on the graph on page 16 to show how the volume of hydrogen would change if a third experiment was carried out using $1.5\,\text{mol dm}^{-3}$ hydrochloric acid and the same mass of magnesium.
(c)[1]
State one use of hydrogen.
(d)[1]
Explain why metal dust can make an explosive mixture with air.