CSEC Chemistry · January 2019 · Paper 2

52 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)2 marksList the apparatus that would be necessary to carry out the experiment.
2. 1(b)9 marksUse the information in Figure 1 to complete Table 1.
3. 1(c)(i)1 markUse an asterisk (*) to indicate the titration data that should be used to obtain the average titration volume of potassium dichromate used in the experiment.
4. 1(c)(ii)2 marksHence, calculate the average volume of potassium dichromate used in the experiment and record the value to two decimal places.
5. 1(d)1 markUsing the information from (c)(ii), calculate the average number of moles of potassium dichromate used in the experiment.
6. 1(e)1 markFrom the equation given on page 4, determine the number of moles of iron ions (Fe²⁺) that react with 1 mole of dichromate ions (Cr₂O₇²⁻).
7. 1(f)1 markCalculate the number of moles of iron in the iron salt sample.
8. 1(g)1 markCalculate the mass of iron in the iron salt sample. [Molar mass of Fe is 55.8 g mol⁻¹.]
9. 1(h)1 markCalculate the percentage of iron in the iron salt sample.
10. 1(i)1 markThe reaction between iron and dichromate is considered a reduction-oxidation reaction. Define the term 'reduction' in terms of electrons.
11. 1(j)2 marksIn the reaction, Fe²⁺ acts as a reducing agent. Define the term 'reducing agent'.
12. 1(k)2 marksCalculate the oxidation state of Cr in Cr₂O₇²⁻.
13. 1(l)1 markState ONE precaution that should be taken when carrying out the experiment.
14. 2(a)(i)2 marksDefine the term 'diffusion'.
15. 2(a)(ii)2 marksExplain how the diffusion of the scent of the curry supports the particulate theory of matter.
16. 2(a)(iii)3 marksDiffusion is a process that can also occur in liquids. State how the arrangement of particles in a liquid differs from that in a solid and a gas.
17. 2(a)(iv)2 marksApart from diffusion, identify ONE process that supports the particulate theory of matter and state ONE example of such a process.
18. 2(b)(i)1 markState whether the mixture of curry powder and water is a suspension or colloid.
19. 2(b)(ii)1 markState the MOST appropriate technique that could be used in a school laboratory to separate this mixture.
20. 2(b)(iii)4 marksDraw a clearly labelled diagram of the apparatus that could be set up in the school laboratory to separate the mixture of curry powder and water. In your diagram, show the location of the separated components.
21. 3(a)(i)3 marksState ONE natural source of hydrocarbons and TWO possible uses of Compound A.
22. 3(a)(ii)2 marksDraw the FULLY DISPLAYED structure of Compound A.
23. 3(b)(i)2 marksDefine the term 'catalytic cracking'.
24. 3(b)(ii)1 markState the importance of catalytic cracking in petroleum refineries.
25. 3(c)(i)2 marksDraw a possible FULLY DISPLAYED structural formula of Compound B.
26. 3(c)(ii)1 markState ONE physical property common to both Compound A and Compound B.
27. 3(d)(i)1 markState which of the two compounds, A or B, reacts with bromine.
28. 3(d)(ii)1 markState the colour change that is observed when the reaction occurs.
29. 3(d)(iii)2 marksWrite a balanced chemical equation for the reaction.
30. 4(a)(i)2 marksDefine EACH of the following terms: Atomic number
31. 4(a)(ii)2 marksDefine EACH of the following terms: Mass number
32. 4(b)(i)2 marksDraw a diagram to show the arrangement of electrons in a sodium atom.
33. 4(b)(ii)1 markState the period to which the element sodium belongs in the periodic table.
34. 4(b)(iii)2 marksDescribe the type of bonding in sodium metal.
35. 4(c)(i)2 marksDefine the term 'electrolysis'.
36. 4(c)(ii)6 marksWrite the half equations, including state symbols, for the reaction that occurs at the anode and cathode during the electrolysis of concentrated sodium chloride solution (brine).
37. 5(a)(i)1 markName the homologous series to which Compound D belongs.
38. 5(a)(ii)2 marksDraw the FULLY DISPLAYED structural formula of Compound D and write its name.
39. 5(a)(iii)1 markName of Compound D
40. 5(b)(i)2 marksWrite a balanced chemical equation for the reaction between Compound D and ethanol to form Compound E.
41. 5(b)(ii)2 marksSuggest the conditions for the reaction between Compound D and ethanol.
42. 5(b)(iii)1 markState the type of reaction that occurs between Compound D and ethanol.
43. 5(c)(i)2 marksWrite a balanced chemical equation for the reaction between Compound D and sodium metal.
44. 5(c)(ii)2 marksDescribe ONE test that could be used to identify the gas.
45. 5(c)(iii)2 marksState whether the salt formed will be soluble in water, giving a reason for your answer.
46. 6(a)(i)2 marksState ONE way in which diamond differs physically from graphite.
47. 6(a)(ii)1 markState ONE similarity between diamond and graphite other than they both contain carbon.
48. 6(b)(i)3 marksWrite a balanced chemical equation, including state symbols, to show the formation of carbon monoxide.
49. 6(b)(ii)2 marksState TWO effects of carbon monoxide inhalation on the human body.
50. 6(c)(i)3 marksWrite a balanced chemical equation, including state symbols, for the laboratory preparation of carbon dioxide gas from calcium carbonate.
51. 6(c)(ii)3 marksDraw a clearly labelled diagram to show the arrangement of the apparatus and materials that could be used in the laboratory to prepare and collect the carbon dioxide gas.
52. 6(c)(iii)1 markState ONE use of carbon dioxide as it relates to the beverage industry.