CSEC Chemistry · January 2002 · Paper 2

74 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 marksExplain what is meant by a 'normal salt' and an 'acid salt'.
2. 1(a)(i) [P2]2 marksWrite an ionic equation for the reaction taking place in the flask.
3. 1(a)(ii)2 marksDescribe a suitable test to distinguish between a normal salt and an acid salt.
4. 1(a)(ii) [P2]1 markWhat is the volume of hydrogen collected in the syringe?
5. 1(a)(iii) [P2]2 marksHow many moles of hydrogen were collected at rtp? (1 mol of any gas at rtp has a volume of 24 dm³.)
6. 1(a)(iv) [P2]1 markHow many moles of magnesium were used up?
7. 1(a)(v) [P2]1 markExplain why the volume of gas in the syringe is the volume of hydrogen produced, although air was already in the flask.
8. 1(a)(vi) [P2]2 marksSelect the apparatus for drying the gas by circling X, Y or Z, and select the apparatus to collect the dried gas by circling P, Q or R.
9. 1(a)(vii) [P2]3 marksSuggest a reason why some gas should be allowed to escape before collecting dry hydrogen.
10. 1(b)(i)4.5 marksIn preparing samples of barium sulphate and zinc sulphate, discuss the possibilities of using the action of acid on the metal.
11. 1(b)(i) [P2]4 marksRead off the height of the precipitate present in EACH test tube in millimetre and record it on the table.
12. 1(b)(ii)4.5 marksIn preparing samples of barium sulphate and zinc sulphate, discuss the possibilities of using titration using acid and alkali.
13. 1(b)(ii) [P2]6 marksPlot the results on the grid provided and draw the line of best fit.
14. 1(b)(iii) [P2]1 markIn which test tube are the ions of neither solution M nor N in excess?
15. 1(b)(iv) [P2]3 marksName the ions present in the SOLUTION in Test tube 6 on page 4.
16. 1(b)(v)a)1 mark5.0 cm³ of solution N completely reacts with ______ cm³ of Solution M.
17. 1(b)(v)b)1 mark1 mole of lead ions completely reacts with ______ moles of iodide ions.
18. 1(b)(vi) [P2]2 marksUse the answer in (v) b) to write the equation for the reaction taking place between lead ions and iodide ions.
19. 1(c)(i)2 marksGiving full experimental details, outline a suitable method for preparing a sample of dry barium sulphate, specifying the reactions to be used.
20. 1(c)(ii)3 marksProvide a description of the method for preparing the dry barium sulphate sample.
21. 1(c)(iii)2 marksWrite all relevant equations for the preparation of barium sulphate.
22. 2(a)4 marksDraw a fully labelled diagram of the apparatus that could have been used to carry out Experiment I.
23. 2(a) [P2]12 marksComplete Table 1 by filling in the missing values for Species, Atomic Number, Mass Number, Arrangement of Electrons, Number of Neutrons, Formula of Chloride, and Type of Bonding.
24. 2(b) [P2]3 marksIllustrate, using an example, what you understand by the term 'isotope'.
25. 2(b)(i)2 marksMake a sketch of the graph in Figure 1 and on it draw the results for the decomposition of hydrogen peroxide at room temperature in the absence of manganese dioxide.
26. 2(b)(ii)a)5 marksConsidering Figure 1 and your answer to (b)(i), discuss the effect of temperature on the rate of production of oxygen, including energy profile diagrams where necessary.
27. 2(b)(ii)b)5 marksDiscuss the effect of manganese dioxide on the rate of production of oxygen, including energy profile diagrams where necessary.
28. 2(b)(iii)2 marksHow will the mass of manganese dioxide at the end of the reaction compare to that at the beginning of Experiment I? Give ONE reason for your response.
29. 2(c)2 marksDescribe how it can be confirmed that the gas produced in Experiment I is oxygen.
30. 3(a) [P2]2 marksState the name of Polymer A and the group of compounds to which it belongs.
31. 3(a)(i)a)4.5 marksBriefly discuss how ethanol can be obtained from a fermentation process, including reagents, reaction conditions, and relevant chemical equations.
32. 3(a)(i)b)4.5 marksBriefly discuss how ethanol can be obtained from ethene, including reagents, reaction conditions, and relevant chemical equations.
33. 3(a)(ii)4 marksDraw a fully labelled diagram of the apparatus which can be used to obtain a sample of ethanol from the fermentation product mixture.
34. 3(a)(iii)2 marksHow can it be determined that the sample collected in (a)(ii) above is ethanol?
35. 3(b)2 marksEthanol is oxidized in the body to CO2 and H2O, giving off 30 kJ per gram. Calculate the energy produced when 100 cm³ of an alcoholic drink (15% ethanol by weight, density 1 g/cm³) is consumed.
36. 3(b) [P2]2 marksGive the name and molecular formula of a simple sugar that can be formed from Polymer A.
37. 3(c)3 marksState the chemical principles upon which the breath analyzer test for suspected drunken drivers is based.
38. 3(c) [P2]1 markState ONE difference in physical properties between Polymer A and a simple sugar.
39. 3(d) [P2]4 marksExplain how a simple sugar can be used to supply energy in the human body, including a chemical equation.
40. 3(e) [P2]1 markTo a mixture of Polymer A in water, excess dilute hydrochloric acid was added and boiled, then iodine was added. What would you observe?
41. 3(f) [P2]5 marksWhat would you expect to observe if a solution of iron(III) chloride were warmed with a simple sugar and some aqueous sodium hydroxide added? Write TWO ionic equations to support your answer.
42. 4(a)4 marksIdentify the more feasible route for the extraction of magnesium and zinc from their oxides, giving a reason for each choice.
43. 4(a) [P2]2 marksWrite a balanced equation for the reaction between hydrochloric acid and marble chips.
44. 4(b)(i)2 marksWhy is the conventional process uneconomical for refining bauxite in the Caribbean?
45. 4(b)(i) [P2]2 marksUse data from the graph to determine the total volume of carbon dioxide evolved.
46. 4(b)(ii)3 marksWhy is the Alcoa chlorine approach a more economical process for refining bauxite?
47. 4(b)(ii) [P2]1 markDetermine the mass of carbon dioxide evolved.
48. 4(b)(iii) [P2]2 marksDetermine the mass of marble chips used.
49. 4(c) [P2]2 marksHow would you show that the gas produced is carbon dioxide?
50. 4(c)(i)1 markGive ONE reason why aluminium, and NOT iron, is used in the making of aircrafts.
51. 4(c)(ii)10 marksExplain why iron rusts and aluminium does not rust, supporting your answer with suitable balanced equations.
52. 4(d) [P2]2 marksExplain why nitric acid and NOT sulphuric acid could be used to replace the hydrochloric acid used in the investigation.
53. 4(e) [P2]2 marksExplain why the graph has the shape shown.
54. 4(f) [P2]2 marksSuppose that this experiment were to be repeated using calcium carbonate powder in place of marble chips, would you expect it to be completed in a shorter or longer time? Explain your answer.
55. 5(a) [P2]2 marksX is a mixture of two compounds. Name them.
56. 5(a)(i)a)1 markName ONE example of a fibre used in fabric manufacture sourced from a plant.
57. 5(a)(i)b)1 markName ONE example of a fibre used in fabric manufacture sourced from an animal.
58. 5(a)(i)c)1 markName ONE example of a synthetic fibre used in the manufacture of fabrics.
59. 5(a)(ii)a)3 marksGive the type of monomer unit present in each of the three fibres named in (a)(i).
60. 5(a)(ii)b)6 marksIllustrate, using suitable structures, how THREE monomer units can be linked together to form part of the macromolecules present in the fibres.
61. 5(b)4 marksSuggest why it is recommended that in hot weather, you wear clothing made from naturally occurring fibres rather than synthetic fibres.
62. 5(b) [P2]2 marksWrite an equation to show how the compounds in X react to form ammonia.
63. 5(c)(i)1 markWhich type of fabric (natural or synthetic) will be susceptible to destruction by micro-organisms?
64. 5(c)(i) [P2]1 markGive the name of a compound that could be Y.
65. 5(c)(ii)3 marksGive TWO reasons for your answer to (c)(i), considering bonding and affinity for water.
66. 5(c)(ii) [P2]1 markWhy is it possible to collect ammonia using the method shown?
67. 5(d) [P2]2 marksState the conditions necessary for the production of nitric acid from ammonia.
68. 5(e) [P2]2 marksWhat would you expect to observe if a sample of ammonia gas collected were bubbled into aqueous copper(II) sulphate until no further change took place?
69. 5(f) [P2]5 marksDescribe THREE ways in which the manufacture of ammonia in industry differs from the preparation shown in Figure 4.
70. 6(a)(i)4 marksIdentify W, X, Y and Z in the nitrogen cycle diagram.
71. 6(a)(ii)3 marksExplain the effects of step Y on the availability of nitrates to plants.
72. 6(b)6 marksState THREE advantages and THREE disadvantages of organic farming.
73. 6(c)(i)3.5 marksDefine biological control and discuss the possible long-term implications of its widespread use.
74. 6(c)(ii)3.5 marksDefine chemical control and discuss the possible long-term implications of its widespread use.