CAPE Chemistry Unit 2 · May/June 2023 · Paper 2

43 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 markGive the IUPAC name for Compound A whose molecule is shown below.
2. 1(b)(i)5 marksA hydrocarbon with molecular formula C₆H₁₄ is known to have five structural isomers. Draw the structures for EACH of these isomers in the space provided below.
3. 1(b)(ii)2 marksState the IUPAC names of any TWO isomers in (b) (i).
4. 1(c)(i)2 marksWrite the IUPAC names of the geometrical isomers B and C shown below.
5. 1(c)(ii)2 marksCompound B in (c) (i) reacts with HBr to yield Markovnikov product D as an equal mixture of two optical isomers. Define the term 'optical isomer'.
6. 1(c)(iii)2 marksDraw the structures of the TWO optical isomers obtained in (c) (ii).
7. 1(c)(iv)2 marksState the colour change observed when Compound C in (c) (i) reacts with Br₂.
8. 1(d)(i)3 marksName the functional groups highlighted in the compounds labelled A, B and C in the scheme above.
9. 1(d)(ii)2 marksIdentify the reagents I and II in the scheme above.
10. 1(d)(iii)2 marksIdentify the colour change observed when Compound A is converted to Compound B.
11. 1(d)(iv)1 markBased on your response in (d) (ii), what colour is observed for the conversion of Compound B to Compound C?
12. 1(d)(v)2 marksDraw the structures of Compound D and Compound E in the space provided below.
13. 1(d)(vi)1 markName the reaction used to form Compound E.
14. 1(d)(vii)3 marksGive the reaction mechanism for EACH of the steps in going from Compound A to Compound E, using curved arrows to show the movement of electrons.
15. 2(a)3 marksList THREE characteristics of ethanedioic acid that make it a suitable primary standard.
16. 2(b)2 marksIn preparing the solution of ethanedioic acid for titration against the manganate (VII) solution, two pieces of laboratory apparatus with a high degree of accuracy are required. Name these TWO pieces of apparatus.
17. 2(c)(i)1 markCalculate EACH of the following. The number of moles MnO₄⁻ used
18. 2(c)(ii)1 markThe number of moles Fe²⁺ in the 25.0 cm³ of aqueous R (aq)
19. 2(c)(iii)1 markThe number of moles Fe²⁺ in 1.0 dm³ of R (aq)
20. 2(c)(iv)1 markThe mass of Fe²⁺ in 1 dm³ of R (aq)
21. 2(c)(v)1 markThe percentage Fe²⁺ in the compound [The mass concentration of R is 40.90 g dm⁻³]
22. 2(d)(i)1 markState the meaning of the term 'retention time' (tᵣ), as applied to gas liquid chromatography (GLC).
23. 2(d)(ii)2 marksDistinguish between a 'stationary phase' and a 'mobile phase' as used in chromatography.
24. 2(d)(iii)1 markGive ONE example of a stationary phase commonly used in GLC.
25. 2(d)(iv)1 markGive ONE example of the use of chromatographic methods of separation in industry.
26. 2(e)(i)2 marksDefine the term 'retention factor' (Rᶠ).
27. 2(e)(ii)2 marksCalculate the Rᶠ value for the red dye in EACH of the two samples.
28. 2(e)(iii)2 marksDeduce whether the same red dye is used to make both types of ink. Give a reason for your answer.
29. 2(f)(i)2 marksExplain the term 'solvent extraction'.
30. 2(f)(ii)1 markState ONE use of solvent extraction.
31. 2(f)(iii)2 marksDescribe what is meant by the term 'partition coefficient' as it relates to solvent extraction.
32. 2(f)(iv)4 marksDetermine the mass of Q that will be extracted from 200 cm³ of aqueous solution containing 8 g of Q by shaking it with 50 cm³ of methylbenzene.
33. 3(a)(i)2 marksWrite half-equations to represent the reactions taking place at the anode and cathode in the diaphragm cell.
34. 3(a)(ii)1 markDeduce ONE reason why the anode in the diaphragm cell is NOT made of steel.
35. 3(a)(iii)4 marksDiscuss TWO environmental concerns associated with EACH of the following: The production of chlorine using the diaphragm cell; The manufacture or use of PVC or CFCs.
36. 3(b)(i)2 marksIdentify the condition that causes a bond in CCl₄ to break in the upper atmosphere. Deduce an equation for the formation of the reactive species.
37. 3(b)(ii)2 marksThe reactive species formed from CCl₄ act as catalysts in the decomposition of ozone. Write TWO equations to show how EACH of these species acts as catalysts.
38. 3(b)(iii)1 markState the name given to this upper atmosphere.
39. 3(b)(iv)2 marksDiscuss the importance of the ozone layer to all life on planet earth.
40. 3(c)(i)5 marksIdentify the components labelled A, B, C, D and E in Figure 1.
41. 3(c)(ii)3 marksExplain how this initiative will help maintain levels of oxygen and carbon dioxide in the atmosphere.
42. 3(d)(i)3 marksDefine EACH of the following terms: Reuse, Reduce, Recycle.
43. 3(d)(ii)4 marksComplete the table below outlining simple laboratory tests that would confirm the presence of Pb²⁺ and NO₃⁻.