Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

A student studies how magnesium oxide reacts with excess dilute hydrochloric acid at three different concentrations.
(a(i))[1]

Fill in Table 8.1 by entering the concentrations in the first column.

(a(ii))[1]

Describe what happens to the time needed for the reaction to finish when it is carried out at a lower temperature.

(a(iii))[1]

Describe how the time needed for the reaction to finish changes when large pieces of magnesium oxide are used rather than small pieces.

(b(i))[2]

Name the products at the positive and negative electrodes when molten magnesium chloride is electrolysed with inert electrodes.

(b(ii))[3]

Describe the arrangement, motion and separation between the particles in liquid magnesium chloride.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: 0.8,1.6,0.4

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