CSEC Chemistry · January 2009 · Paper 2

43 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 the effect of increasing the concentration of the reactants on the rate of a chemical reaction.
2. 1(a)(ii)2 marksWrite a balanced equation for the reaction between magnesium and hydrochloric acid.
3. 1(a)(iii)3 marksCalculate the mass of magnesium that will COMPLETELY react with 50 cm³ of 1.5 mol dm⁻³ HCl. (Relative atomic mass of Mg = 24; H = 1; Cl = 35.5)
4. 1(a)(iv)3 marksDescribe how you would prepare 50 cm³ of different concentrations of hydrochloric acid from the solution of 1.5 mol dm⁻³ hydrochloric acid provided.
5. 1(a)(v)3 marksFigure 1 shows a series of diagrams that represents how the students set up the experiment to determine the effect of the concentration of acid on the rate of the reaction. Identify THREE major flaws in the design of…
6. 1(b)(i)3 marksPlot the TOTAL volume of oxygen given off against time, on the graph paper on page 7.
7. 1(b)(ii)2 marksAccount for the shape of the graph obtained.
8. 1(b)(iii)1 markFrom your graph determine the volume of oxygen gas produced after 50 seconds.
9. 1(c)6 marksA number of tests were carried out on an aqueous solution of Compound R. The observations obtained are recorded in Table 2. Write suitable inferences and ionic equations for EACH reaction in the spaces provided.
10. 2(a)(i)1 markDefine the term 'isotopes'.
11. 2(a)(ii)1 markState ONE use of carbon - 14.
12. 2(b)2 marksWrite the electron configurations of ³⁷₁₇Cl and ¹⁴₆C.
13. 2(c)3 marksCalculate the percentage of carbon - 14 in 1 mole of tetrachloromethane, ¹⁴₆C³⁷₁₇Cl₄.
14. 2(d)8 marksBased on your knowledge of the properties of compounds and isotopes, complete Table 3 below by writing the differences between the sets of compounds, and a suitable explanation in EACH case.
15. 3(a)2 marksArrange Metals A, B, D and E in order of reactivity with the MOST reactive FIRST.
16. 3(b)2 marksWrite an ionic equation to represent the reaction between Metal B and dilute nitric acid.
17. 3(c)(i)2 marksWrite an equation to represent the action of heat on the hydroxide of Metal A.
18. 3(c)(ii)2 marksHow would the effect of heat on the hydroxides of Metals A, B and D differ from the effect of heat on the hydroxide of Metal E?
19. 3(d)4 marksWith reference to their positions in the reactivity series, suggest a suitable method of extraction of Metals A and E. Give a reason for your answer in EACH case.
20. 3(e)(i)1 markState ONE reason why metals are often combined with others to form alloys.
21. 3(e)(ii)2 marksName ONE alloy of copper and state the metals used to make it.
22. 4(a)(i)2 marksOn page 14, draw a fully labelled generalized diagram to show how the materials provided could be arranged to conduct the experiment in order to determine whether the substances tested are conductors or non-conductors.
23. 4(a)(ii)4 marksComplete Table 5 to indicate the observations that the students would have made when conducting the experiment.
24. 4(a)(iii)4 marksBy referring to the nature of the substances tested, provide a suitable explanation for EACH observation you recorded in (a) (ii) above. Write your answer in Table 5.
25. 4(b)(i)2 marksDefine the terms 'electrolysis' AND 'cathode'.
26. 4(b)(ii)3 marksCalculate the mass of copper that is deposited during the reaction. (Relative Atomic Mass: Cu = 64; 1F = 96 500 C)
27. 5(a)(i)6 marksWrite a chemical equation to illustrate the reaction taking place in the commercial preparation of ethanol from EACH of the following: a) Ethene b) Glucose. In EACH case you should state the reaction conditions.
28. 5(a)(ii)3 marksDraw a fully labelled diagram of the apparatus that is used to separate the ethanol from the reaction mixture during the fermentation of glucose.
29. 5(b)(i)3 marksUsing Compound C to represent the structure of a fat, draw the structure of the product(s) expected from the saponification of this fat.
30. 5(b)(ii)3 marksWrite an equation to illustrate the process of hydrogenation of an oil represented by Compound D. You should name the catalyst used in the process.
31. 6(a)(i)2 marksName TWO types of glass used in and around the home.
32. 6(a)(ii)2 marksIdentify the MAIN components for ONE of the types of glass named in (a)(i) above.
33. 6(a)(iii)a)4 marksState ONE property of EACH of the two types of glass named in (a) (i) above.
34. 6(a)(iii)b)1 markRelate the property to the use of the type of glass.
35. 6(b)(i)3 marksCompare the mode of action of direct dyes to that of mordant dyes.
36. 6(b)(ii)3 marksSuggest why mordant dyes are used when dyeing cotton fabrics.
37. 6(b)(iii)1 markSuggest a fabric for which direct dyeing can be used.
38. 7(a)(i)7 marksSuggest which bag of fertiliser (A, B or C) the farmers should use to solve the problems encountered in Scenario 1 and Scenario 2 above.
39. 7(a)(ii)1 markProvide a suitable explanation for your selection in EACH case.
40. 7(b)(i)1 markWrite the chemical formula for lime.
41. 7(b)(ii)1 markWhat is the effect of lime on the acidity of a soil?
42. 7(b)(iii)2 marksWrite a balanced ionic equation to illustrate the action of lime on soil.
43. 7(b)(iv)4 marksA cotton farmer recognizes that his soil needs more nitrogen, and lime, so he adds an ammonium fertiliser and lime to the soil at the same time. Explain how this action could cause nitrogen to be lost. Use a balanced…