CSEC Chemistry · May/June 2008 · Paper 2

47 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)a)4 marksWhat is meant by EACH of the following? pH scale
2. 1(a)(i)b)4 marksWhat is meant by EACH of the following? The end point of an acid-base titration
3. 1(a)(ii)2 marksComplete Table 1 below by recording the missing pH meter readings from Figure 1.
4. 1(a)(iii)3 marksUsing the graph paper provided on page 5 and the data in Table 1, plot a graph of pH against volume of sodium hydroxide added.
5. 1(a)(iv)1 markUse the graph to determine the volume of sodium hydroxide which reacts completely with the 20 cm³ of 0.005 mol dm⁻³ sulphuric acid.
6. 1(a)(v)a)2 marksCalculate EACH of the following: The number of moles of sulphuric acid in 20 cm³ of the sulphuric acid used
7. 1(a)(v)b)2 marksCalculate EACH of the following: The number of moles of sodium hydroxide in the volume of sodium hydroxide used in (a) (iv)
8. 1(a)(v)c)1 markCalculate EACH of the following: The number of moles of sodium hydroxide in 1 dm³ of this solution
9. 1(b)1 markComplete Table 2 by filling in the inferences that could be made based on the observations recorded.
10. 1(c)2 marksPlan and design an experiment to determine which of the four catalysts above will be most effective in increasing the rate of decomposition of hydrogen peroxide. Write your answer in the spaces provided. Outline of…
11. 1(c) (diagram)2 marksLabelled diagram of apparatus to be used:
12. 2(a)2 marksIdentify the group in the periodic table in which fluorine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At) are placed. Give ONE reason for your answer.
13. 2(b)3 marksWhat would the students observe when they conduct the experiment represented in Figure 3? Illustrate your answer by means of an equation.
14. 2(c)(i)2 marksDeduce whether X and Y are metals or nonmetals.
15. 2(c)(ii)2 marksBased on your answer to (c) (i) above, describe the bonding in Element Y.
16. 2(c)(iii)2 marksPredict the type of bond that would be formed between X and oxygen. Give a reason for your answer.
17. 2(c)(iv)4 marksBased on the information given in Table 3, arrange the elements Mg, X and Y in order of decreasing activity. Explain your answer.
18. 3(a)(i)1 markDefine 'structural isomerism'.
19. 3(a)(ii)2 marksDraw fully displayed structures of but-1-ene and but-2-ene.
20. 3(a)(iii)2 marksDraw and name ONE OTHER structural isomer of C₄H₈.
21. 3(a)(iv)1 markState ONE physical property of C₄H₈.
22. 3(b)(i)1 markWhat is meant by a 'functional group'?
23. 3(b)(ii)8 marksComplete Table 4 by a) identifying the reagents b) drawing the fully displayed structures of the products.
24. 4(a)(i)3 marksDraw a fully labelled diagram of the apparatus which could be used in the electrolysis of molten BaBr₂. You should indicate the material from which the electrodes are made.
25. 4(a)(ii)4 marksWrite equations to indicate the chemical reactions which occur at the electrodes.
26. 4(a)(iii)5 marksA current of 5A is passed for 2 minutes through the molten BaBr₂. Calculate the mass of the product that will be formed at the cathode. (Relative atomic mass: Ba = 137, Br = 80) (1 Faraday = 96 500 C mol⁻¹)
27. 4(a)(iv)2 marksList TWO factors which can in general affect the products formed during electrolysis of compounds.
28. 4(b)1 markState ONE reason why the reaction of barium with water is faster than the reaction of calcium with water.
29. 5(a)(i)2 marksFrom the compounds A to D above, select ONE compound which is saturated and ONE compound which is unsaturated.
30. 5(a)(ii)4 marksName AND give the general formula for the homologous series to which EACH of the two compounds selected in (a) (i) above belongs.
31. 5(b)3 marksSuggest reasons for using these reaction conditions. Explain your answer in terms of the equation above.
32. 5(c)(i)1 markWith reference to the nitrogen cycle: Name ONE process by which nitrogen in the atmosphere can be converted into nitrates.
33. 5(c)(ii)1 markWith reference to the nitrogen cycle: Name ONE process by which nitrogen in the nitrates in soil is released back into the atmosphere.
34. 5(d)(i)2 marksWhich of these two metal nitrates, P or Q, possibly contains Group I metal? Group 2 metal?
35. 5(d)(ii)2 marksWrite a chemical equation to show the reaction taking place when Q is heated.
36. 6(a)(i)2 marksState TWO benefits of adding sodium carbonate or calcium carbonate to silica in the manufacture of glass.
37. 6(a)(ii)4 marksState how the basic components of glass are modified to produce lead-potassium glass borosilicate glass.
38. 6(b)(i)2 marksWhy is it important that glass does NOT crystallize as it cools?
39. 6(b)(ii)3 marksSuggest how the bonding in SiO₂ affects what happens when glass melts. Explain why this is important for blowing and moulding glass.
40. 6(b)(iii)2 marksAlthough no scarce and vital raw material is used in the manufacture of glass, recycling of glass is strongly recommended. Suggest TWO reasons for this.
41. 6(b)(iv)2 marksGlass is now widely used as a construction material in buildings. State ONE advantage and ONE disadvantage of using glass in this way.
42. 7(a)(i)1 markState the importance of EACH of the following factors in plant growth: Mineral balance
43. 7(a)(ii)1 markState the importance of EACH of the following factors in plant growth: pH
44. 7(a)(iii)2 marksState the importance of EACH of the following factors in plant growth: Humus content of the soil
45. 7(b)(i)2 marksBriefly describe the test for the presence of ammonium ions in a soil sample.
46. 7(b)(ii)4 marksThe Officer finds the soil to be acidic and recommends the addition of lime. Suggest ONE possible reason for the acidic nature of the soil. Explain the effect of adding lime to the soil. Use a suitable equation to…
47. 7(c)5 marksThe farmer, in addition to adding the recommended lime to the soil, also decides to add an ammonium fertilizer, thinking that it would increase his crop yield. Do you think that the farmer's decision to add both lime…