CAPE Chemistry Unit 2 · 2009 · Paper 2

47 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)1 markDraw the structural formula for intermediate X in the reaction scheme.
2. 1(a)(ii)1 markState the condition required for Stage I.
3. 1(a)(iii)1 markState the reagent required for Stage II.
4. 1(b)(i)2 marksWrite a general equation showing the basic property of phenylamine.
5. 1(b)(ii)a)1 markState whether phenylamine is more basic or less basic than ammonia.
6. 1(b)(ii)b)4 marksExplain your answer in terms of availability of lone pairs and hydrogen bonding.
7. 1(c)(i)1 markWrite the formula of intermediate Y.
8. 1(c)(ii)2 marksState the reagents and condition required for Stage III.
9. 1(c)(iii)1 markName the reagent used to dissolve the phenol in Stage IV.
10. 1(c)(iv)1 markState the colour of the azo dye when phenol is used in Stage IV.
11. 2(a)(i)1 markDefine the term 'Equivalence point'.
12. 2(a)(ii)1 markDefine the term 'End point'.
13. 2(b)2 marksUse the example of barium chloride and sodium carbonate to explain the technique of back titration.
14. 2(c)(i)2 marksWrite the equation for the precipitation of barium ions.
15. 2(c)(ii)2 marksCalculate the number of moles of Na2CO3 remaining after filtration.
16. 2(c)(iii)1 markDeduce the number of moles of BaCl2 which reacted with the sodium carbonate solution.
17. 2(c)(iv)1 markCalculate the concentration of barium ions in mol dm⁻³.
18. 2(d)(i)4 marksList FOUR steps a student must follow to successfully standardize a solution of potassium manganate(VII) by titration using an oxalic acid solution.
19. 2(d)(ii)1 markIdentify the indicator in the titration in (d)(i).
20. 3(a)(i)2 marksDefine the term 'nitrogen fixation'.
21. 3(a)(ii)2 marksState TWO ways by which nitrogen fixation can occur.
22. 3(b)2 marksWrite ONE balanced equation involving nitrogen in the production of acid rain.
23. 3(c)2 marksSuggest TWO human activities which may contribute to the disruption of the atmospheric equilibrium.
24. 3(d)2 marksSuggest TWO reasons why governments are reluctant to take actions to reduce atmospheric pollution.
25. 3(e)(i)1 markState the colour of the bauxite ore at A.
26. 3(e)(ii)1 markName the reagent, B.
27. 3(e)(iii)2 marksState the colour and appearance of the aluminium hydroxide at C.
28. 3(e)(iv)1 markState ONE process occurring at D.
29. 4(a)(i)a)1 markDefine 'Stereoisomerism'.
30. 4(a)(i)b)1 markDefine 'Chiral centre'.
31. 4(a)(ii)2 marksCopy the displayed formula of alanine in your answer booklet. Place an asterisk (*) to identify the chiral centre AND state the type of isomerism exhibited.
32. 4(a)(iii)2 marksWrite the displayed formulae of the two isomers of alanine.
33. 4(a)(iv)4 marksWrite the displayed formula of the species present in aqueous solutions of alanine at: a) pH = 2, b) pH = 13, c) pH = 7.
34. 4(b)(i)1 markState the type of polymerisation involved in the formation of a dipeptide molecule.
35. 4(b)(ii)3 marksWrite the equation, using displayed formulae, to show the formation of the dipeptide molecule AND circle the peptide link.
36. 4(b)(iii)1 markName the functional group represented by the peptide link.
37. 5(a)(i)2 marksState TWO principles upon which IR spectroscopy is based.
38. 5(a)(ii)2 marksState the TWO categories of molecular vibrations exhibited by molecules.
39. 5(a)(iii)2 marksOutline the steps in the preparation of a solid compound for examination in an IR spectrometer.
40. 5(b)(i)3 marksUse the data booklet to identify the bonds represented by peaks A, B, and C in Figure 4.
41. 5(b)(ii)1 markSuggest the structure of molecule Y.
42. 5(c)(i)3 marksSuggest TWO advantages and ONE disadvantage of using steam for the extraction process illustrated in Figure 5.
43. 5(c)(ii)2 marksExplain what effect the length of the extractor in Figure 5 will have on the distillation process.
44. 6(a)(i)3 marksList THREE substances produced by the chlor-alkali industry.
45. 6(a)(ii)6 marksDescribe the chemical processes involved in the production of TWO of the substances listed in (a)(i) using a diaphragm cell, including: a) type of chemical reaction taking place, b) equations representing the chemical…
46. 6(b)3 marksState THREE categories of compounds for which chlorine is used in their manufacture.
47. 6(c)3 marksDiscuss the function of SO2 in food preservation, including ONE disadvantage.