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8.1 Purity, formulations and chromatography

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Question 18
H

A student measured the distance to the top edge of a spot instead of to the centre of the spot.

What effect does this have on the Rf R_f\,Rf​ value the student calculates?

[1]
A

It is unchanged, because the solvent distance is also measured to an edge

B

It is too high, because the distance moved by the substance is too large

C

It is too low, because the distance moved by the substance is too small

D

It is unchanged, because an RfR_fRf​ value is a ratio of two distances

Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

40 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.

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