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Chromatographic Methods of Separation · CAPE Chemistry Unit 2

37 past-paper questions on Chromatographic Methods of Separation, part of Analytical Methods and Separation Techniques, from every CAPE Chemistry Unit 2 paper on Quelpr.

Practise Chromatographic Methods of Separation
  1. 5(d)2 marks· CAPE Chemistry Unit 2 · 2010 · Paper 2State two industrial applications of chromatography.
  2. Q271 mark · multiple choice· CAPE Chemistry Unit 2 · 2012 · Paper 1Which of the following is NOT a stationary phase used in chromatography?
  3. Q281 mark · multiple choice· CAPE Chemistry Unit 2 · 2012 · Paper 1The R_f value of Compound A is
  4. 2(a)1 mark· CAPE Chemistry Unit 2 · 2012 · Paper 2State ONE use of chromatography in criminal investigations.
  5. 2(b)4 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2Outline FOUR essential experimental steps in the separation of the components of a dye using thin-layer chromatography (TLC).
  6. 2(c)2 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2Define the terms 'stationary phase' and 'mobile phase' in relation to thin-layer chromatography (TLC).
  7. 2(d)2 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2Name TWO materials commonly used as the stationary phase in TLC.
  8. 2(e)(i)2 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2Calculate the Rf values of components A and B using the measurements provided in Figure 1.
  9. 2(e)(ii)2 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2Suggest TWO reasons for the difference in the Rf values of A and B.
  10. 2(e)(iii)2 marks· CAPE Chemistry Unit 2 · 2012 · Paper 2State TWO factors, other than the distance travelled by the solvent, which influence the Rf value of a solute.
  11. Q261 mark · multiple choice· CAPE Chemistry Unit 2 · 2013 · Paper 1A mixture of gases containing methanol, ethanol, propan-1-ol and propan-2-ol, was obtained from a refinery. What method can be used to separate these gases for analysis?
  12. Q291 mark · multiple choice· CAPE Chemistry Unit 2 · 2013 · Paper 1Which of the following entities is NOT a visualising agent in chromatography?
  13. Q41 mark · multiple choice· CAPE Chemistry Unit 2 · 2014 · Paper 1The ideal detector used in gas chromatography (GC) has specific characteristics. Which of the following characteristics are for a GC detector? I. Adequate sensitivity II. Good stability III. Short response time IV.…
  14. Q261 mark · multiple choice· CAPE Chemistry Unit 2 · 2014 · Paper 1Which of the following media is NOT a visualising agent in chromatography?
  15. Q271 mark · multiple choice· CAPE Chemistry Unit 2 · 2014 · Paper 1A student carries out an experiment using thin-layer chromatography separation on silica gel and obtains the following results: Compound | Distance Travelled (cm) Compound A | 1.5 Compound B | 9.1 Solvent | 12.5 The…
  16. Q211 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1Which of the following materials are commonly used stationary phases in chromatography?
  17. Q261 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1A mixture of gases containing methanol, ethanol, propan-1-ol and propan-2-ol, was obtained from a refinery. What method can be used to separate these gases for analysis?
  18. Q301 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1Compound X contains three components P, Q and R. Component P is needed as the starting material for the synthesis of a new drug. Which of the following methods of chromatography is MOST suitable for obtaining a pure…
  19. 5(a)4 marks· CAPE Chemistry Unit 2 · 2015 · Paper 2Explain how chromatography can be used to separate a mixture of dyes.
  20. 5(b)(i)2 marks· CAPE Chemistry Unit 2 · 2015 · Paper 2Explain how the presence of the components can be detected.
  21. 5(b)(ii)3 marks· CAPE Chemistry Unit 2 · 2015 · Paper 2Calculate the Rf (retention factor) values of Q and R shown in Figure 1.
  22. 5(b)(iii)2 marks· CAPE Chemistry Unit 2 · 2015 · Paper 2Suggest TWO reasons for the difference in the Rf values of R and Q.
  23. 5(c)4 marks· CAPE Chemistry Unit 2 · 2015 · Paper 2Assess the methods of thin layer chromatography and column chromatography in relation to their uses.
  24. Q281 mark · multiple choice· CAPE Chemistry Unit 2 · 2016 · Paper 1In the chromatographic experiment, the mobile phase used was tetrachloromethane. Which of the following statements are true? I. Component A is most soluble in the mobile phase. II. Component A is most soluble in the…
  25. Q161 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Item 16 refers to the following diagram which represents a paper chromatogram of food dyes obtained using water as the solvent. A spot of a sample was originally placed at Z. It contained the components X and Y. Which…
  26. Q211 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Which of the following materials are commonly used stationary phases in chromatography?
  27. Q281 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Compound X contains three components, P, Q and R. Component P is needed as the starting material for the synthesis of a new drug. Which of the following methods of chromatography is MOST suitable for obtaining a pure…
  28. 2(c)(i)1 mark· Chemistry · Unit 2 Q2 2(c)(i)Name the process by which TLC separates α-amino acids.
  29. 2(c)(ii)2 marks· Chemistry · Unit 2 Q2 2(c)(ii)The chromatogram was treated to show the positions of the separated α-amino acids. Explain how the student could analyse the chromatogram to identify the three α-amino acids that were present.
  30. 2(c)(iii)2 marks· Chemistry · Unit 2 Q2 2(c)(iii)Several α-amino acids have structures that are very similar. Suggest why this could cause problems when using TLC to analyse mixtures of α-amino acids.
  31. 2(d)(i)1 mark· Chemistry · Unit 2 Q2 2(d)(i)State the meaning of the term 'retention time' (tᵣ), as applied to gas liquid chromatography (GLC).
  32. 2(d)(ii)2 marks· Chemistry · Unit 2 Q2 2(d)(ii)Distinguish between a 'stationary phase' and a 'mobile phase' as used in chromatography.
  33. 2(d)(iii)1 mark· Chemistry · Unit 2 Q2 2(d)(iii)Give ONE example of a stationary phase commonly used in GLC.
  34. 2(d)(iv)1 mark· Chemistry · Unit 2 Q2 2(d)(iv)Give ONE example of the use of chromatographic methods of separation in industry.
  35. 2(e)(i)2 marks· Chemistry · Unit 2 Q2 2(e)(i)Define the term 'retention factor' (Rᶠ).
  36. 2(e)(ii)2 marks· Chemistry · Unit 2 Q2 2(e)(ii)Calculate the Rᶠ value for the red dye in EACH of the two samples.
  37. 2(e)(iii)2 marks· Chemistry · Unit 2 Q2 2(e)(iii)Deduce whether the same red dye is used to make both types of ink. Give a reason for your answer.

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