CAPE Chemistry Unit 2 · 2012 · Paper 2

35 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)8 marksDraw and state the name of FOUR isomeric alcohols with molecular formula C4H10O.
2. 1(b)1 markIdentify the type of isomerism illustrated in (a).
3. 1(c)1 markState ONE other type of isomerism that can be displayed by alcohols.
4. 1(d)4 marksDescribe the expected observation when EACH isomer in (a) is treated with acidified potassium permanganate.
5. 1(e)1 markState the colour change with K2Cr2O7/H+(aq) which would indicate a positive result.
6. 2(a)1 markState ONE use of chromatography in criminal investigations.
7. 2(b)4 marksOutline FOUR essential experimental steps in the separation of the components of a dye using thin-layer chromatography (TLC).
8. 2(c)2 marksDefine the terms 'stationary phase' and 'mobile phase' in relation to thin-layer chromatography (TLC).
9. 2(d)2 marksName TWO materials commonly used as the stationary phase in TLC.
10. 2(e)(i)2 marksCalculate the Rf values of components A and B using the measurements provided in Figure 1.
11. 2(e)(ii)2 marksSuggest TWO reasons for the difference in the Rf values of A and B.
12. 2(e)(iii)2 marksState TWO factors, other than the distance travelled by the solvent, which influence the Rf value of a solute.
13. 3(a)3 marksDescribe how the concepts of reuse, recycle and reduce can be applied to paper as a solid waste.
14. 3(b)2 marksSuggest TWO ways in which the presence of nuclear waste can affect the terrestrial environment.
15. 3(c)2 marksState the names OR chemical formulae of TWO landfill gases produced by chemical and microbial reactions.
16. 3(d)(i)5 marksDescribe, with the aid of equations, the steps involved in the fermentation of sucrose.
17. 3(d)(ii)3 marksWhen beer is exposed to air, it produces a sharp smell and becomes 'sour'. Identify TWO possible compounds responsible for the sharp smell and state the type of reaction responsible.
18. 4(a)(i)1.5 marksGive the structural formula for the product of the reaction of Compound A with aqueous bromine.
19. 4(a)(ii)1.5 marksGive the structural formula for the product of the reaction of Compound A with liquid bromine.
20. 4(a)(iii)1.5 marksGive the structural formula for the product of the reaction of Compound A with cold KMnO4/H+.
21. 4(a)(iv)1.5 marksGive the structural formula for the product of the reaction of Compound A with hot KMnO4/H+.
22. 4(b)1 markState whether Compound A exhibits geometric (cis/trans) isomerism.
23. 4(c)2 marksGive TWO reasons for your answer in (b).
24. 4(d)5 marksOutline the mechanism for the reaction between Compound A and HBr, using curved arrows to show the movement of electrons.
25. 4(e)1 markState the type of reaction mechanism outlined in (d).
26. 5(a)5 marksState the names and functions of the pieces of apparatus shown in Figure 2 and Figure 3.
27. 5(b)(i)1 markWrite an equation to explain the term 'partition coefficient' or 'distribution coefficient' using the example of an ester dissolved in a mixture of water and toluene.
28. 5(b)(ii)2 marksState TWO factors which affect the value of the partition coefficient.
29. 5(b)(iii)4 marksExplain the principles of solvent extraction with respect to the recovery of an organic compound from an aqueous solution.
30. 5(b)(iv)3 marksA solution of 10.0 g of an ester, Y, in 100 cm3 of water was shaken with 200 cm3 of ether. After separation, the aqueous solution was found to contain 1.6 g of Y. Calculate the partition coefficient of Y between ether…
31. 6(a)4 marksList FOUR factors which would influence the location of an industrial plant.
32. 6(b)4 marksState TWO safety concerns associated with the locating of an ammonia plant and for EACH concern suggest a measure that can be taken to reduce its effect.
33. 6(c)4 marksWrite TWO equations for the conversions of carbon monoxide and nitrogen monoxide to carbon dioxide and nitrogen, respectively, in catalytic converters.
34. 6(d)(i)2 marksWrite an equation to support the reason that sulphur dioxide is a pollutant because it produces acid rain.
35. 6(d)(ii)1 markGive ONE reason (other than the production of acid rain) why sulphur dioxide is considered to be a pollutant.