CSEC Chemistry · May/June 2019 · Paper 2

53 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)3 marksFrom the stopwatches displayed in Figure 1 on page 5, record the times for the hydrogen gas to be collected in Column 3 in Table 1. The time taken for Experiment 1 has already been recorded for you.
2. 1(a)(ii)3 marksUsing the formula Rate = 1/Time, calculate the rate of reaction for each experiment and record these values to 3 decimal places in Column 4 of Table 1. The rate of reaction for Experiment 1 has already been calculated…
3. 1(a)(iii)5 marksUsing the grid provided on page 7, plot a graph of rate versus time for Experiments 1-6. Draw the best curve through the points.
4. 1(b)(i)2 marksBased on the graph plotted on page 7, deduce how the rate of the reaction varied with time.
5. 1(b)(ii)2 marksExplain how the trend in the rate of reaction stated in (b)(i) relates to the surface area of the zinc granules.
6. 1(b)(iii)3 marksList THREE factors, other than surface area, that affect the rate of a reaction.
7. 1(c)1 markState ONE safety precaution that Michael and Jennifer may have taken during the experiments.
8. 1(d)1 markSuggest ONE way in which Michael and Jennifer may have controlled the temperature during the experiments.
9. 1(e)(i)2 marksWrite a balanced chemical equation, including state symbols, for the reaction between zinc metal and sulfuric acid.
10. 1(e)(ii)3 marksCalculate the total volume of hydrogen gas that would be produced at RTP from 0.55 g of zinc granules. [RAM: Zn = 65.4; 1 mole of a gas occupies 24 000 cm³ at RTP]
11. 2(a)2 marksExplain why these elements are all placed in Period 3 of the Periodic Table.
12. 2(b)3 marksWhich element in Table 2 forms an oxide which readily dissolves in water to give a solution with a pH greater than 7? Write a balanced equation to support your answer.
13. 2(c)1 markThe element sulfur, S, can exist as different allotropes. Define the term 'allotrope'.
14. 2(d)2 marksDraw a diagram to show the arrangement of electrons in sulfur.
15. 2(e)(i)1 markState the type of bond that forms when sulfur reacts with chlorine.
16. 2(e)(ii)3 marksExplain why the type of bond stated in (e)(i) is formed.
17. 2(f)1 markWrite the formula of a compound which is formed when sulfur reacts with chlorine.
18. 2(g)2 marksDraw a dot and cross diagram to show the bonding in the compound stated in (f).
19. 3(a)(i)1 markDefine the term 'polymer'.
20. 3(a)(ii)2 marksDistinguish between 'addition polymerization' and 'condensation polymerization'.
21. 3(b)(i)1 markState the type of polymerization represented in Figure 2.
22. 3(b)(ii)1 markGive an explanation for your choice in (b)(i).
23. 3(c)(i)1 markIdentify ONE use of EACH of the following types of polymers: Polyester
24. 3(c)(ii)1 markIdentify ONE use of EACH of the following types of polymers: Polyalkene
25. 3(d)(i)1 markState the homologous series to which Compounds A and B belong.
26. 3(d)(ii)1 markState the name of Compound A.
27. 3(d)(iii)2 marksCompounds A and B react to form Compound C. Sketch the FULLY DISPLAYED structural formula for Compound C.
28. 3(d)(iv)1 markIdentify the homologous series of Compound C.
29. 3(d)(v)2 marksState TWO other types of reactions that Compound A can undergo.
30. 4(a)(i)2 marksDescribe ONE simple test, including the observations, which could be used to distinguish between D and E.
31. 4(a)(ii)3 marksSketch a unit cell of sodium chloride.
32. 4(a)(iii)1 markState the type of bonding that occurs in sodium chloride.
33. 4(b)(i)2 marksDiscuss the relative reactivity of Mg, Ca and X with water.
34. 4(b)(ii)2 marksWrite a balanced chemical equation for the reaction between water and the unknown element (X).
35. 4(c)(i)1 markSuggest a formula for this compound.
36. 4(c)(ii)3 marksState whether an aqueous solution of this compound would be acidic or basic and give ONE reason for your answer.
37. 4(c)(iii)1 markState ONE test to determine if an aqueous solution of this compound is acidic or basic.
38. 5(a)(i)3 marksList THREE general characteristics of a homologous series.
39. 5(a)(ii)2 marksWrite the molecular formulae of the second and third members of the alkane homologous series.
40. 5(a)(iii)2 marksDerive the general formula of the alkane homologous series.
41. 5(b)(i)1 markDefine the term 'structural isomerism'.
42. 5(b)(ii)3 marksDraw a FULLY DISPLAYED structural formula of 1-Butene and its two isomers.
43. 5(c)(i)1 markDefine the term 'unsaturated'.
44. 5(c)(ii)1 markState what is meant by a hydrogenation reaction.
45. 5(c)(iii)2 marksDraw the FULLY DISPLAYED structural formula for the hydrogenation product of 1-Butene.
46. 6(a)(i)1 markDefine the term 'alloy'.
47. 6(a)(ii)3 marksName ONE alloy of aluminium and state its use based on one of its enhanced properties.
48. 6(b)(i)2 marksState which of the TWO metals is more reactive: Fe or Zn. Give a reason for your answer.
49. 6(b)(ii)2 marksUsing the data in Table 3 on page 22, deduce the order of reactivity of the four metals Cu, Fe, Zn and Pb, from the most reactive to the least reactive metal.
50. 6(b)(iii)2 marksAccount for the observations made from the reaction between the iron and copper sulfate solution.
51. 6(b)(iv)2 marksWrite the ionic equation, including state symbols, for the reaction between the iron and copper sulfate solution.
52. 6(c)(i)1 markIdentify which of the metals used in the experiment in (b) is MOST hazardous to the environment.
53. 6(c)(ii)2 marksState TWO harmful effects of continuous exposure to the metal identified in (c)(i) on human beings.