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International A LevelChemistryEdexcelExam Questions4: Rates, Equilibria and Further Organic Chemistry4.9 Organic Analytical Techniques

Organic Analytical Techniques (Edexcel International A Level Chemistry)

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4.9 Organic Analytical Techniques

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4.9 Organic Analytical Techniques

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11 mark

In HPLC, the mobile and stationary phases are

      Mobile phase Stationary phase
  ☐ A gas liquid
  ☐ B gas solid
  ☐ C liquid gas
  ☐ D liquid solid

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    1
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    The mass spectrum of the compound shown is obtained using a high resolution mass spectrometer.

    q7-paper-5-jan-2022-edexcel-ial-chemistry

    What is the mass to charge ratio, m/ z, of the molecular ion of this compound?

    [Ar values: H = 1.0078    C = 12.0000    O = 15.9949]

    • 92.0261

    • 92.0312

    • 93.0339

    • 93.0390

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    2a
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    This question is about chromatography.

    a)
    A spot caused by an amino acid has moved 42 mm from the baseline of a paper chromatogram.
    The Rf value for the amino acid under these conditions is 0.62.

    What is the distance moved by the solvent?

    • 680 mm

    • 68 mm

    • 42 mm

    • 26 mm

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    2b1 mark
    b)
    In gas chromatography, GC, which of these would be the most suitable carrier gas?

    • argon

    • hydrogen

    • methane

    • oxygen

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    31 mark

    How many peaks are there in the carbon-13 (13C) NMR spectrum of methylcyclohexane?

    q15-paper-5-june-2021-edexcel-ial-chemistry

    • one

    • three

    • five

    • seven

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    41 mark

    In gas chromatography, a gas containing a mixture is passed over a liquid stationary phase. The main reason a mixture is separated into its components is because they have different

    • boiling temperatures

    • forces of attraction to the liquid

    • relative molecular masses

    • volatilities

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    51 mark

    In the high resolution proton NMR spectrum of propan-2-ol, CH3CHOHCH3 there are

    • one singlet, one doublet and a heptet

    • one singlet, two doublets and a heptet

    • two singlets and two triplets

    • three singlets and a quartet

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    61 mark

    A mixture of organic compounds was analysed using thin-layer chromatography.

    The Rf value was 0.92 for one of the components in the mixture.

    What can be deduced about the attractions between that component and the stationary and mobile phases?

          Attraction between component and
    stationary phase    		 Attraction between component and
    mobile phase
      ☐ A strong strong
      ☐ B strong weak
      ☐ C weak weak
      ☐ D weak strong

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