O-LevelChemistryMetals & Reactivity5070/42 · May/June 2023 · Q16 Marks
A student investigates the rusting of iron. Fig. 1.1 shows the apparatus the student uses. [Figure 1.1 showing three experiments, A, B, C. All experiments use 'apparatus X' and an 'iron nail'. Experiment A: iron nail in water. Experiment B: iron nail in dry air, stoppered. Experiment C: iron nail in water with a layer of oil on top.]
- (a)Name apparatus X.[1]
- (b)State why a stopper is used in Experiment B.[1]
- (c)State why the water in Experiment C is boiled before use.[1]
- (d)State why a layer of oil is used in Experiment C.[1]
- (e)The experiments are left for one week. Predict in which of the experiments the nail will have rusted. Explain your prediction.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.
- [1] (a) test-tube / boiling tube
- [1] (b) prevent entry of water (vapour)
- [1] (c) remove (dissolved) oxygen
- [1] (d) prevent entry of oxygen
- [1] (e) M1 only the nail in A will rust
- [1] (e) M2 both oxygen and water are needed for rusting
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →