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Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter

Elements, Compounds and Mixtures

69 practice questions

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Practice questions

11–11 of 11 · Hard

  1. Question 11

    7 marks · Hard

    A chemist is given two samples labelled X and Y. She suspects that X is a compound and Y is a mixture. She performs paper chromatography on both samples along with three dyes labelled D1, D2, and D3 on the same sheet.

    Geometry diagram with points Origin, Solvent front
    Chromatogram for samples and dyes
    Distances moved by spots (all from the pencil line at the bottom of the paper)
    SubstanceDistance moved by spot (cm)
    Solvent front5.0
    X2.0
    Y (spot 1)1.0
    Y (spot 2)3.0
    D11.0
    D22.0
    D33.0
    (a)

    Classify samples X and Y as elements, compounds, or mixtures, using the results of the chromatogram. Explain your reasoning.

    [3 marks]
    (b)

    For each spot found for Y, identify which dye(s), if any, are present in Y.

    [2 marks]
    (c)

    Calculate the R_f value for the spot found for X.

    [2 marks]
    Answer and see the solution →