Chromatography: past paper questions
Real questions on chromatography
The newest 12 of 12 written questions. Open one to see it on the real paper.
- 5070/41 · October/November 2020 · Q1a[1]
Name the process the student uses to separate the mixture of dyes.
See it on the paper → - 5070/41 · October/November 2020 · Q1b[1]
The apparatus shown in the diagram is set up incorrectly. Explain why. The apparatus is then set up correctly. The solvent travels up the paper. The paper is removed and then dried. The result is shown in the diagram. solvent front paper baseline A B mixture C of dyes D
See it on the paper → - 5070/41 · October/November 2020 · Q1c[1]
Which of the dyes A, B, C and D are present in the mixture of dyes?
See it on the paper → - 5070/41 · October/November 2020 · Q1d(i)[1]
Measure the distance between: • the baseline and the solvent front cm • the baseline and the position of A cm.
See it on the paper → - 5070/41 · October/November 2020 · Q1d(ii)[1]
Calculate the R f value of A. R f value of A
See it on the paper → - 5070/41 · May/June 2020 · Q5a(ii)[1]
Four students do the paper chromatography separation. The diagrams show four sets of apparatus used by the students. Three of the students make mistakes in setting up the apparatus. lid chromatography paper chromatography paper spots of pigment depth of ethanol baseline drawn in ink baseline drawn in ink depth of ethan...
See it on the paper → - 5070/41 · May/June 2020 · Q5a(iii)[4]
Describe two mistakes made by the students shown in the diagrams. Explain why each mistake will prevent the chromatography from working correctly. mistake 1: explanation: mistake 2: explanation:
See it on the paper → - 5070/41 · May/June 2020 · Q5a(iv)[1]
Chromatography often uses water in the beaker. Suggest why ethanol is used instead of water in this experiment.
See it on the paper → - 5070/41 · May/June 2020 · Q5b(i)[1]
How many pigments are there in grass? Explain your answer.
See it on the paper → - 5070/41 · May/June 2020 · Q5b(ii)[1]
Which pigment is in all of the plants?
See it on the paper → - 5070/41 · May/June 2020 · Q5b(iii)[2]
Calculate the R f value for pigment W.
See it on the paper → - 5070/41 · May/June 2020 · Q5b(iv)[1]
Which of the plants contain pigment W?
See it on the paper →
What examiners said
Most candidates recognised that the solvent level was too high; some stated the answer in reverse.
— Examiner report, October/November 2020, 5070/41 Q1(b) (Cambridge)
Many candidates identified all of the correct answers; some answers were incomplete.
— Examiner report, October/November 2020, 5070/41 Q1(c) (Cambridge)
Most candidates could calculate this. A significant number did the division the wrong way round, ending up with an answer of 4 rather than 0.25.
— Examiner report, October/November 2020, 5070/41 Q1(d)(ii) (Cambridge)
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