CAPE Chemistry Unit 2 · 2017 · Paper 2

39 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)3 marksState THREE characteristic properties of a homologous series of compounds.
2. 1(b)(i)2 marksCalculate the empirical formula of Compound A.
3. 1(b)(ii)1 markCalculate the molecular formula of Compound A.
4. 1(c)(i)1 markWrite the general formula of the homologous series of which Compound A is a member.
5. 1(c)(ii)1 markDraw the structural formula of the chlorosubstituted compound of A.
6. 1(d)2 marksComment on the relative pKa values of Compound A and its chlorosubstituted compound in (c)(ii).
7. 1(e)(i)3 marksDescribe a simple laboratory test to distinguish between CH3CH2CH2OH and CH3CH(OH)CH3.
8. 1(e)(ii)2 marksDescribe a simple laboratory test to distinguish between benzene and cyclohexene.
9. 2(a)(i)2 marksDefine the term 'accuracy'.
10. 2(a)(ii)2 marksDefine the term 'precision'.
11. 2(b)1 markSuggest a separation technique that would be MOST effective in the extraction of eugenol (oil) from cloves (plant) in its natural source.
12. 2(c)(i)3 marksFrom Figure 1, list the letters of THREE pieces of apparatus that could be used in solvent extraction.
13. 2(c)(ii)2 marksFrom Figure 1, list the letters of TWO pieces of apparatus that could be used in gravimetric analysis.
14. 2(d)(i)1 markWrite the equation for the formation of the dry calcium oxalate precipitate.
15. 2(d)(ii)4 marksCalculate the percentage of Ca2+ in the sample.
16. 3(a)(i)1 markState the reason why the presence of ozone in the stratosphere is beneficial to humans.
17. 3(a)(ii)4 marksWrite the relevant equations showing the formation of ozone in the stratosphere.
18. 3(b)(i)2 marksList TWO harmful effects of tropospheric ozone on humans.
19. 3(b)(ii)3 marksDescribe, with relevant equations, the production of tropospheric ozone resulting from the use of internal combustion engines.
20. 3(c)5 marksComplete Table 1 by inserting the relevant test and inferences to identify the pollutants.
21. 4(a)6 marksDefine the terms 'primary', 'secondary', and 'tertiary' as applied to alcohols, providing relevant examples using structural formulae for each.
22. 4(b)(i)2 marksState the type of reaction producing Compound D and write its structural formula.
23. 4(b)(ii)2 marksExplain the reactions which led to the production of Compounds E and F.
24. 4(c)(i)2 marksDeduce the structural formulae of Compounds E and F.
25. 4(c)(ii)2 marksDeduce the structural formulae of Compounds A and B.
26. 4(d)1 markComment on the reaction of Compounds A and B to plane polarized light.
27. 5(a)(i)3 marksList THREE characteristics of a primary standard.
28. 5(a)(ii)2 marksState whether sodium hydroxide can be considered a primary standard and give a reason for your answer.
29. 5(b)4 marksExplain fully the shape of the graph in Figure 2.
30. 5(c)(i)1 markCalculate the number of moles of sodium hydrogen carbonate used.
31. 5(c)(ii)2 marksCalculate the number of moles of acid reacted, using the equivalence point from Figure 2.
32. 5(c)(iii)1 markCalculate the concentration of the acid.
33. 5(d)1 markState ONE other titrimetric method that could be used without an indicator by the student in (b).
34. 5(e)1 markIdentify the responding variable involved in the method stated in (d).
35. 6(a)(i)2 marksDefine the term 'cracking' as applied to petroleum chemistry.
36. 6(a)(ii)2 marksDefine the term 'reforming' as applied to petroleum chemistry.
37. 6(b)4 marksUsing an appropriate equation, apply the principles of chemical equilibrium to deduce the theoretical conditions for the production of ammonia.
38. 6(c)5 marksDiscuss the actual conditions employed in industrial plants for ammonia production.
39. 6(d)2 marksExplain ONE possible effect of the ammonia industry on groundwater usage.