CSEC Chemistry · January 2014 · Paper 2

49 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)2 marksDefine the term 'normal salt'.
2. 1(a)(ii)2 marksIdentify ONE other type of salt that can be formed from the reaction between dilute sulfuric acid and sodium hydroxide. Write the chemical formula for that salt.
3. 1(a)(iii)1 markState the name of ONE other acid that can also produce the type of salt identified in (ii) above.
4. 1(b)(i)2 marksComplete Table 1 by using the readings shown in Figure 1.
5. 1(b)(ii)1 markDetermine the volume of acid used to neutralize 25 cm³ of NaOH.
6. 1(b)(iii)1 markExplain why NO indicator was used in the procedure in Part B.
7. 1(b)(iv)2 marksComplete the procedure for Part B by stating Step 3. Step 3 is required for obtaining a dry sample of the normal salt.
8. 1(b)(ix)3 marksThe students noticed that when the sodium hydroxide solution was made in Part A, the volumetric flask got warm. Draw an energy profile diagram to show the heat change when sodium hydroxide dissolves in water.
9. 1(b)(v)2 marksWrite a balanced equation for the formation of the normal salt from sulfuric acid and sodium hydroxide.
10. 1(b)(vi)3 marksCalculate the number of moles of sulfuric acid used to neutralize the sodium hydroxide.
11. 1(b)(vii)2 marksCalculate the mass of the normal salt expected from the reaction.
12. 1(b)(viii)1 markThe actual mass of salt obtained by the students was 0.09 g. Suggest ONE possible reason for the difference between the mass of salt expected and the mass obtained.
13. 1(c)3 marksComplete Table 2 by inserting the inference and writing an ionic equation as indicated.
14. 2(a)(i)2 marksDefine the term 'electrolysis'.
15. 2(a)(ii)1 markState the type of anode that is used in the purification of copper.
16. 2(b)(i)1 markWhich of the electrodes (Electrode 1 or Electrode 2) in the diagram is the cathode?
17. 2(b)(ii)1 markWrite the formula of the ion that migrates towards the anode.
18. 2(b)(iii)2 marksWrite a balanced ionic equation for the reaction occurring at the cathode.
19. 2(b)(iv)4 marksA current of 5 amperes is passed through the molten lead bromide for 5 minutes. Calculate the mass of lead that would be deposited. (RAM: Pb = 207; Faraday's constant, F = 96 500 C mol⁻¹)
20. 2(c)4 marksExplain the observations from BOTH experiments.
21. 3(a)2 marksState the name of the homologous series to which EACH of Compounds B and C belongs.
22. 3(b)2 marksCompound A burns with a blue flame in oxygen. Write a balanced equation for this reaction.
23. 3(c)2 marksState which of the two compounds, A or B, is more soluble in water. Give a reason for your answer.
24. 3(d)2 marksState whether Compound A or Compound C would react more vigorously with sodium metal and give a reason for your choice.
25. 3(e)2 marksWrite a balanced equation for the reaction of Compound C with sodium metal.
26. 3(f)2 marksDescribe ONE test that could be used to identify the gas that is produced in the reaction of Compound C with sodium.
27. 3(g)3 marksCompounds A and C react together in the presence of a catalyst to form Compound D. State the name of the catalyst and draw the FULLY DISPLAYED structure of Compound D.
28. 4(a)(i)2 marksCalculate the relative atomic mass of Element M.
29. 4(a)(ii)2 marksWrite a balanced equation, including state symbols, to show the formation of the chloride of M.
30. 4(a)(iii)a)2 marksDescribe the formation of the type of bond found in Element M.
31. 4(a)(iii)b)2 marksDescribe the formation of the type of bond found in the chloride of Element M.
32. 4(b)(i)5 marksWith reference to the bonding in graphite and M, and their relative positions in the Periodic Table, explain why graphite is used as an electrode and M is not.
33. 4(b)(ii)2 marksDraw a diagram to show the bonding in the element chlorine.
34. 5(a)(i)2 marksName the TWO by-products.
35. 5(a)(ii)a)2 marksWrite balanced ionic equations for the production of chlorine.
36. 5(a)(ii)b)2 marksWrite balanced ionic equations for the production of ONE of the named by-products in (i) above.
37. 5(b)(i)3 marksIdentify TWO physical processes by which water leaves the atmosphere and ONE physical process by which water enters the atmosphere.
38. 5(b)(ii)2 marksExplain ONE way in which this may affect the water cycle.
39. 5(c)(i)1 markWrite a balanced chemical equation to show the action of heat on the hydroxide of R.
40. 5(c)(ii)2 marksPredict what will happen to the carbonates of R and T when heated strongly.
41. 5(c)(iii)1 markState a reason why it is more likely to find R rather than T combined with other substances in nature.
42. 6(a)(i)2 marksDefine the term Pollution.
43. 6(a)(ii)2 marksDefine the term Environment.
44. 6(b)12 marksDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include ONE pollutant responsible for global warming and ONE pollutant for acid rain.
45. 6(b)22 marksDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include a possible source for EACH pollutant identified above.
46. 6(b)32 marksDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include a balanced chemical equation for ONE of the pollutants to show how it is formed.
47. 6(b)42 marksDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include ONE effect that global warming can have on EACH of the two named industries.
48. 6(b)52 marksDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include ONE effect that acid rain can have on EACH of the two named industries.
49. 6(b)61 markDiscuss the possible impact that global warming and acid rain can have on the agriculture and tourism industries in the Caribbean. Include at least ONE suggestion for reducing ONE of the pollutants.