CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2

33 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)5 marksSuggest reagents to be used in EACH of the transformations (i), (ii), (iii), (iv), and (v).
2. 1(b)(i)1.33 marksDraw the structure for the monosubstituted product formed from the reaction of chlorine with benzene.
3. 1(b)(ii)1.33 marksDraw the structure(s) for the monosubstituted product(s) formed from the reaction of chlorine with methylbenzene.
4. 1(b)(iii)1.34 marksDraw the structure for the monosubstituted product formed from the reaction of chlorine with nitrobenzene.
5. 1(c)(i)1 markSuggest a reason for the position of the chlorine on the benzene ring in the product of benzene.
6. 1(c)(ii)1 markSuggest a reason for the position of the chlorine on the benzene ring in the product(s) of methylbenzene.
7. 1(c)(iii)1 markSuggest a reason for the position of the chlorine on the benzene ring in the product of nitrobenzene.
8. 1(d)3 marksList benzene, methylbenzene, and nitrobenzene in order of increasing ease of reactivity with chlorine (least reactive first), and explain your answer.
9. 2(a)4 marksState THREE reasons why NaHCO3 can be used as a primary standard and ONE reason why sodium hydroxide (NaOH) may NOT be used.
10. 2(b)(i)2 marksWrite the balanced equation for the reaction between sodium hydrogen carbonate and sulphuric acid.
11. 2(b)(ii)4 marksCalculate the mass in grams of sodium hydrogen carbonate that the student used to neutralise the acid if 23.00 cm3 of 6.00 mol dm-3 sulphuric acid were used from the burette.
12. 2(c)5 marksOutline FIVE experimental steps to be carried out in the determination of the ethanoic acid content of vinegar by titration with sodium hydroxide solution.
13. 3(a)(i)3 marksList THREE human activities, OTHER THAN agricultural, which lead to water pollution.
14. 3(a)(ii)2 marksState TWO effects of water pollution.
15. 3(b)(i)2 marksSuggest TWO reasons why farmers need to use chemical fertilisers in crop production.
16. 3(b)(ii)2 marksExplain how fertilisers cause water pollution.
17. 3(c)6 marksDescribe a simple laboratory test that would confirm the presence of EACH of Pb2+ and NO3- ions in a sample of water.
18. 4(a)6 marksComplete Table 1 by predicting the outcome (products or no reaction) for the reactions of ethanol, phenol, and ethanoic acid with Na2CO3, Na, and NaOH.
19. 4(b)4 marksWith reference to the Lewis structure and resonance forms of the phenoxide ion and the Lewis structure of the alkoxide ion, compare and explain the difference in acidity between alcohols and phenols.
20. 4(c)2 marksGive TWO characteristics of a homologous series.
21. 4(d)(i)1 markWhat is meant by the term 'structural isomerism'?
22. 4(d)(ii)2 marksUsing the molecular formula, C3H8O, draw the displayed formulae of TWO structural isomers.
23. 5(a)(i)4 marksIdentify the parts of the mass spectrometer numbered (2), (3), (4), and (5) in Figure 2.
24. 5(a)(ii)2 marksWhat is the purpose of the heated filament, (1)?
25. 5(b)2 marksData from the mass spectrum of bromine gives mass numbers 79 (50.5%) and 81 (49.5%). Calculate to 3 significant figures the relative atomic mass of bromine.
26. 5(c)(i)4 marksSketch the mass spectrum of bromine vapour in the m/e region indicated in Figure 3 (m/e 156 to 163).
27. 5(c)(ii)3 marksWhat is the origin of EACH of the THREE peaks in your spectrum?
28. 6(a)2 marksName TWO substances which can be fermented to produce alcohol.
29. 6(b)4 marksOutline, using relevant equations, the process by which sucrose is converted to ethanol.
30. 6(c)2 marksWrite an equation for the oxidation of alcohol (ethanol) to ethanal.
31. 6(d)2 marksIdentify TWO physiological changes in the body which result from the abuse of alcohol consumption.
32. 6(e)(i)3 marksOutline THREE economic benefits of ethanol (alcohol) production.
33. 6(e)(ii)2 marksSuggest TWO measures that can be used to reduce the negative social effects of alcohol abuse.