Instrumental Methods of Analysis (Triple)

Instrumental Methods of Analysis (Triple) Quiz

Spec 4.8.3.6–7 · AQA GCSE Chemistry: Quiz

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  1. 1. Which of these is NOT one of the three advantages of instrumental methods stated in the specification?

    • A. Accurate
    • B. Cheap
    • C. Sensitive
    • D. Rapid

  2. 2. What does flame emission spectroscopy analyse to identify metal ions?

    • A. The precipitate colour formed with sodium hydroxide
    • B. The light produced when the sample is placed in a flame
    • C. The pH of the solution
    • D. The mass of the sample

  3. 3. How is an Rf value calculated in chromatography?

    • A. Distance moved by solvent divided by distance moved by substance
    • B. Distance moved by substance divided by distance moved by solvent
    • C. Mass of substance divided by mass of solvent
    • D. Time taken divided by distance moved

  4. 4. How can chromatography show that a compound is pure?

    • A. It produces two spots close together
    • B. It produces a single spot in every solvent tested
    • C. It does not move at all on the paper
    • D. It changes colour when heated

  5. 5. A student has a solution containing a mixture of several metal ions in very low concentration and needs to identify each one precisely. Why would flame emission spectroscopy be more suitable than a simple flame test here?

    • A. It is cheaper to carry out with no equipment needed
    • B. It relies on judging colour changes by eye, which is more reliable for mixtures
    • C. It is accurate, sensitive and rapid, so it can identify ions precisely even at low concentration and when several are mixed together
    • D. It only works for a single ion at a time, making mixtures easier to interpret

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