CAPE Chemistry Unit 2 · 2014 · Paper 2

48 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 markState the role of the UV radiation in the reaction.
2. 1(a)(ii)2 marksWrite equations to show the steps occurring in the propagation stage for the formation of dibromomethane from bromomethane.
3. 1(b)(i)2 marksWrite the expression for the basic dissociation constant, Kb.
4. 1(b)(ii)1 markThe pKb values for ethylamine and phenylamine are 3.27 and 9.38 respectively. State which of these compounds is the stronger base.
5. 1(b)(iii)2 marksState TWO reasons for the difference between the two pKb values in (b)(ii).
6. 1(c)(i)1 markSuggest a value for Kb for ethanamide, CH3CONH2.
7. 1(c)(ii)1 markState a reason for your answer in (c)(i).
8. 1(d)5 marksComplete Table 1 by inserting the appropriate observations for tests (i) to (iv).
9. 2(a)(i)1 markUse an arrow to indicate, below the sketch, the direction of increasing frequency.
10. 2(a)(ii)2 marksIdentify the region (A, B or C) where EACH of Infrared and X-rays may be found.
11. 2(b)2 marksCalculate the wavelength of electromagnetic radiation with frequency of 4.5 x 10^15 Hz. (Velocity of light = 3.0 x 10^8 m s^-1)
12. 2(c)1 markState ONE example of the use of gravimetric analysis in quality control.
13. 2(d)(i)2 marksState the purpose for performing Step 1 and Step 4.
14. 2(d)(ii)2 marksState TWO pieces of apparatus that should be used in Step 2.
15. 2(d)(iii)1 markState the apparatus that should be used in Step 3.
16. 2(e)4 marksCalculate the value of x in the formula Na2SO4.xH2O.
17. 3(a)(i)2 marksWrite the equation for the process.
18. 3(a)(ii)1 markIndicate the conditions of temperature and pressure.
19. 3(a)(iii)1 markState the process by which nitrogen is produced for the production of ammonia.
20. 3(a)(iv)2 marksState TWO factors which should influence the location of an ammonia industrial plant.
21. 3(b)(i)2 marksExplain the effect on the yield of ammonia by raising the temperature.
22. 3(b)(ii)2 marksExplain the effect on the yield of ammonia by raising the pressure.
23. 3(c)(i)3 marksIdentify the process occurring at A, B, and D.
24. 3(c)(ii)1 markState the condition necessary at C.
25. 3(c)(iii)1 markWhat is the physical state of ammonia after the process at D?
26. 4(a)2 marksExplain the terms 'primary', 'secondary' and 'tertiary' as applied to halogenoalkanes.
27. 4(b)(i)1 markWrite the name of Compound A.
28. 4(b)(ii)2 marksExplain the nature of the isomerism exhibited by Compound A.
29. 4(b)(iii)2 marksDraw the structural formulae of the isomers showing the relationship between them.
30. 4(c)(i)1 markState the name of the compound, B.
31. 4(c)(ii)5 marksOutline the mechanism for this reaction using curved arrows to indicate the movement of electrons.
32. 4(d)(i)1 markDescribe the reaction between a solution of D and aqueous silver nitrate.
33. 4(d)(ii)1 markWrite the equation for this reaction.
34. 5(a)(i)2 marksDescribe how the electron beam is used in the analysis of an organic compound.
35. 5(a)(ii)2 marksDescribe how the magnetic field is used in the analysis of an organic compound.
36. 5(a)(iii)2 marksDescribe how the recorder is used in the analysis of an organic compound.
37. 5(b)2 marksExplain the importance of the (M + 1) peak in mass spectra.
38. 5(c)(i)1 markDeduce the m/z ratio of the molecular ion.
39. 5(c)(ii)1 markDeduce the m/z ratio of the base peak.
40. 5(c)(iii)3 marksDeduce the formulae of the ion fragments of m/z ratios 15, 29 and 43.
41. 5(c)(iv)1 markDeduce the structural formula of Compound X.
42. 5(d)1 markWrite the structural formula of an isomer possessing similar physical properties as X.
43. 6(a)(i)5 marksExplain, with the aid of relevant equations, the destruction of stratospheric ozone.
44. 6(a)(ii)1 markIdentify a man-made activity which contributes to stratospheric ozone destruction.
45. 6(a)(iii)2 marksState TWO effects of stratospheric ozone destruction on human life.
46. 6(b)(i)3 marksDescribe, with the aid of an equation, the reaction which occurs during the fermentation process in the production of ethanol.
47. 6(b)(ii)1 markState the process used to obtain ethanol of concentration above 95% from a fermentation batch.
48. 6(c)3 marksComment on the statement "The production of ethanol is a major contributor to the economies of Caribbean countries", stating TWO reasons in support.