CAPE Chemistry Unit 2 · 2016 · Paper 2

37 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)1 markDefine the term 'structural isomerism'.
2. 1(b)(i)4 marksCalculate the formula of the hydrocarbon, X.
3. 1(b)(ii)1 markHence, write its displayed formula.
4. 1(c)(i)2 marksWrite the name and displayed formula for EACH of the other two alcohols.
5. 1(c)(ii)2 marksWhen butan-2-ol is heated with phosphoric acid, a mixture of alkenes is produced, one of which exhibits isomerism. Write the names and displayed formulae of the two isomers of this alkene.
6. 1(d)5 marksComplete Table 1 by describing simple laboratory tests to distinguish between EACH pair of compounds: CH3CH(OH)CH3 vs CH3CH2CH2OH, and CH3CH(OH)CH3 vs CH3CCH3(OH)CH3.
7. 2(a)3 marksExplain the origin of infrared (IR) absorption by compounds.
8. 2(b)2 marksState the properties of compounds which absorb IR radiation.
9. 2(c)(i)2 marksIdentify the groups responsible for the above absorptions.
10. 2(c)(ii)3 marksState the name of Compound Y and draw its displayed formula.
11. 2(d)4 marksDescribe the steps taken in the preparation of a solid sample for IR analysis.
12. 2(e)1 markState ONE limitation of IR spectroscopy.
13. 3(a)2 marksSulfur dioxide and sulfur trioxide can cause acid rain if allowed to escape during the Contact Process. Write an equation to represent the formation of acid rain by ONE of these compounds.
14. 3(b)2 marksOutline TWO ways in which other industrial chemicals lead to water pollution.
15. 3(c)(i)2 marksExplain how a named pollutant affects the quality of water for human consumption.
16. 3(c)(ii)2 marksExplain how a named pollutant affects the aquatic environment.
17. 3(d)(i)5 marksComplete Table 2 by outlining simple laboratory tests that would confirm the presence of Pb²⁺ and NO3⁻ in a sample of water.
18. 3(d)(ii)2 marksWrite the ionic equation to represent the test on Pb²⁺ in Table 2.
19. 4(a)2 marksState the type of reaction labelled I and IV.
20. 4(b)4 marksList the reagents and conditions required for Reactions II and IV.
21. 4(c)1 markDraw the displayed formula for Compound X.
22. 4(d)4 marksOutline the mechanism for Reaction I using curved arrows to indicate the movement of electrons, being careful to identify the various steps involved.
23. 4(e)3 marksWrite the structural formula for the products formed when phenol is treated with (i) aqueous bromine, (ii) sodium hydroxide, (iii) ethanoyl chloride.
24. 4(f)1 markWrite the equation for the reaction in (e)(iii).
25. 5(a)(i)2 marksState Raoult's law for an ideal mixture of two liquids.
26. 5(a)(ii)2 marksList TWO characteristics of an ideal solution.
27. 5(b)(i)1 markDefine the term 'azeotropic mixture'.
28. 5(b)(ii)1 markState ONE reason why azeotropes are NOT compounds.
29. 5(b)(iii)6 marksUsing the graph showing the composition of a minimum boiling point mixture, explain clearly the result of distilling a mixture of Composition X as indicated.
30. 5(c)3 marksAn aqueous solution contains 2.5 g of a compound in 50 cm³ of solution. The partition coefficient of the compound between water and an organic solvent is 0.200. Calculate the mass of the compound extracted by shaking…
31. 6(a)(i)4 marksDescribe the process involved in the production of aluminium from alumina. (Include appropriate equations.)
32. 6(a)(ii)1 markState the effect of the production of oxygen on the process.
33. 6(a)(iii)1 markWrite an equation to represent the effect in (a)(ii).
34. 6(b)3 marksSuggest THREE factors which would influence the location of a bauxite plant.
35. 6(c)(i)1 markDefine the term 'recycling'.
36. 6(c)(ii)2 marksDescribe how aluminum is recycled.
37. 6(d)3 marksSuggest THREE ways in which recycled aluminium can be used.