CSEC Chemistry · May/June 2009 · Paper 2

54 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)2 marksDescribe what would be observed in the polystyrene cup in Figure 1.
2. 1(a)(i)b)1 markWhat does the observation you described in a) above indicate about the relative positions of zinc and copper in the reactivity series?
3. 1(a)(i)c)2 marksDistinguish between an exothermic and an endothermic reaction.
4. 1(a)(ii)a)2 marksUsing the readings in Figure 2, complete Table 1 to show the final thermometer readings, and the changes in temperature.
5. 1(a)(ii)b)3 marksOn the graph paper provided on page 5, plot the temperature change (ΔT) against mass of zinc added.
6. 1(a)(iii)2 marksCalculate the minimum mass of zinc required to completely react with 100 cm³ of 0.20 mol dm⁻³ copper(II) sulphate. Relative atomic mass of Zn = 65.
7. 1(a)(iii)c)1 markFrom your graph, deduce the temperature change (ΔT) that will occur when 1.0 g of zinc is added to the copper(II) sulphate solution.
8. 1(a)(iv)1 markUse the information in (iii) above to explain why the different masses of zinc used in Experiments 4 and 5 give approximately the same change in temperature.
9. 1(a)(v)2 marksAnother group of students performs a similar experiment but uses silver instead of zinc. No temperature change is observed. Account for this observation.
10. 1(b)(i)2 marksComplete Table 2 to show all of the possible inferences and write ionic equations where indicated.
11. 1(b)(ii)1 markSuggest a possible identity of the solid, R:
12. 1(c)(i)2 marksOutline the procedure for the experiment.
13. 1(c)(ii)1 markList the materials necessary.
14. 1(c)(iii)1 markWhat evidence will result from your procedure to distinguish between the two acids?
15. 2(a)(i)1 markName the THREE states of matter.
16. 2(a)(ii)2 marksWhich of the two temperatures, (A) and (B) in Figure 3 represents melting point? boiling point?
17. 2(a)(iii)1 markWhat would be observed at (C) in Figure 3?
18. 2(a)(iv)2 marksName the process which occurs when the following conversions take place. Water vapour → water Iodine (s) → iodine (g)
19. 2(b)(i)1 markExplain what is meant by the term 'allotrope'.
20. 2(b)(ii)2 marksWhich of the two allotropes of carbon, diamond or graphite, conducts electricity? Explain your answer in terms of the structure and bonding of the two allotropes. Conducts electricity: Explanation:
21. 2(c)(i)1 markName ONE natural source of hydrocarbons.
22. 2(c)(ii)1 markDefine the term 'structural isomerism'.
23. 2(c)(iii)4 marksIn the space provided below draw fully displayed structures of TWO isomers of a hydrocarbon with four carbon atoms. Name the TWO isomers.
24. 3(a)(i)1 markName the property of compounds upon which fractional distillation is based.
25. 3(a)(ii)2 marksName the lightest and heaviest fractions that are usually obtained from the fractional distillation of crude oil. Lightest fraction: Heaviest fraction:
26. 3(a)(iii)2 marksState ONE use of EACH of the fractions named in (a) (ii) above. Lightest fraction: Heaviest fraction:
27. 3(b)(i)2 marksDraw the structure of the product formed when Compound A reacts with EACH of the following: Bromine Sodium
28. 3(b)(ii)2 marksDraw the partial structure of the polymer formed when Compound A undergoes ADDITION polymerisation with other molecules of A. Use three molecules of A in the representation of the partial polymer structure.
29. 3(c)(i)1 markName the type of polymerisation process involved in the formation of B.
30. 3(c)(ii)a)2 marksDraw the monomer formed when B undergoes acid hydrolysis.
31. 3(c)(ii)b)1 markState ONE difference in the reaction conditions required for acid hydrolysis when compared to enzyme hydrolysis of polyamides.
32. 4(a)4 marksState the basis upon which elements are arranged into groups and periods in the periodic table. Select an element from Table 3 and use its electronic configuration to illustrate your answer.
33. 4(b)(i)3 marksIdentify from Table 3: ONE element which can be extracted from its oxide by electrolytic reduction but NOT chemical reduction with coke. Give a reason for your answer.
34. 4(b)(ii)3 marksIdentify from Table 3: TWO elements, one of which will displace the other from a solution containing its ions. Write an ionic equation to illustrate your answer.
35. 4(c)5 marksIodine and chlorine will combine to form iodine monochloride (ICl). Suggest the type of bonding which would occur in this compound. Give a reason for your answer and use dot-cross diagrams to illustrate your answer.
36. 5(a)(i)2 marksName the catalyst and state the temperature used in the manufacture of ammonia.
37. 5(a)(ii)2 marksThe temperatures currently used in the manufacture of ammonia make the process cost-effective. Suggest ONE reason for this.
38. 5(a)(iii)1 markSuggest ONE reason for the importance of Step D in Figure 4.
39. 5(b)(i)2 marksWrite a balanced equation to show the laboratory preparation of ammonia.
40. 5(b)(ii)2 marksDescribe a suitable test for identifying ammonia.
41. 5(c)(i)4 marksWrite balanced equations for Steps 2 and 3 to show the production of nitric acid from ammonia.
42. 5(c)(ii)2 marksState TWO OTHER uses of ammonia.
43. 6(a)(i)3 marksBriefly explain what is meant by EACH of the following terms as they relate to pottery production. Plasticity Porosity Vitrification
44. 6(a)(ii)2 marksSuggest ONE reason why EACH of the following makes clay a suitable substance for the making of pottery. Plasticity Porosity
45. 6(b)(i)1 markName ONE component of cement.
46. 6(b)(ii)2 marksIdentify TWO OTHER ingredients used to make concrete.
47. 6(b)(iii)4 marksExplain to Mr. Smith why it is necessary to dampen the concrete floor. Suggest to Mr. Smith what may occur if he decides NOT to dampen the floor.
48. 6(c)3 marksSuggest if it would be appropriate to dampen clay while hardening. Give ONE reason for your answer.
49. 7(a)(i)4 marksWhat is meant by the term 'humus' as it relates to soil?
50. 7(a)(ii)4 marksState THREE reasons why humus is an important component of soil.
51. 7(b)1 markFor which ions is the student MOST likely testing?
52. 7(c)4 marksSuggest ONE advantage and ONE disadvantage EACH of biological and chemical control of pests.
53. 7(d)(i)2 marksWhat is meant by the term 'hydroponics'?
54. 7(d)(ii)4 marksAdvise Mrs. Wills on TWO advantages and TWO limitations of setting up such a farm.