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CAPE Chemistry Unit 2 · 2015 · Paper 2 · Question 5(b)(i)

Figure 1 shows the TLC separation of a mixture of amino acids obtained from hydrolysis of a dipeptide.

Explain how the presence of the components can be detected.

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Other parts of this question

  1. 5(a)Explain how chromatography can be used to separate a mixture of dyes.[4 marks]
  2. 5(b)(ii)Calculate the Rf (retention factor) values of Q and R shown in Figure 1.[3 marks]
  3. 5(b)(iii)Suggest TWO reasons for the difference in the Rf values of R and Q.[2 marks]
  4. 5(c)Assess the methods of thin layer chromatography and column chromatography in relation to their uses.[4 marks]

More practice: the rest of this paper · more Chromatographic Methods of Separation questions · all CAPE Chemistry Unit 2 past papers