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CSEC Chemistry · January 2006 · Paper 2

42 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.

Practise this paper
  1. 1(a)(i)7 marksIn the space below construct Table 1 to record the titration results. You should include the initial and final burette volumes and the volume of solution X used.
  2. 1(a)(ii)1 markWhat is the volume of X to be used for calculation?
  3. 1(a)(iii)1 markCalculate the concentration of sulphuric acid in solution X in mol dm⁻³. (Relative atomic mass: H = 1; S = 32; O = 16)
  4. 1(a)(iv)1 markCalculate the number of moles of sulphuric acid used in the titration.
  5. 1(a)(v)2 marksWrite a balanced equation for the reaction between the sulphuric acid and sodium hydroxide solutions.
  6. 1(a)(vi)1 markDetermine the number of moles of sodium hydroxide in the 25 cm³ of solution used.
  7. 1(a)(vii)2 marksCalculate the concentration of NaOH in g dm⁻³. (Relative atomic mass: Na = 23; O = 16; H = 1)
  8. 1(a)(viii)1 markCalculate the percentage purity of the sodium hydroxide solution.
  9. 1(b)(i)3 marksDraw a fully labelled diagram of the arrangement of the apparatus that the student may have used for conducting the experiment.
  10. 1(b)(ii)4 marksUsing the graph paper on page 5, plot a graph of temperature against time.
  11. 1(b)(iii)1 markFrom the graph determine the melting point of stearic acid.
  12. 1(c)(i)1 markTo a sample of solution P, dilute nitric acid is added, followed by a few drops of silver nitrate solution. Inference: No Cl⁻, Br⁻ or I⁻ ions present.
  13. 1(c)(ii)1 markTo a sample of solution P, a few copper turnings are added, followed by concentrated sulphuric acid. Observation: Brown fumes evolve which turn moist blue litmus red. Inference: (missing)
  14. 1(c)(iii)1 markTo a sample of solution P, a few drops of acidified aqueous potassium manganate (VII) solution are added. Observation: (missing) Inference: The potassium manganate (VII) solution changes from purple to colourless.
  15. 1(c)(iv)2 marksTo a sample of solution P, aqueous sodium hydroxide is added, until in excess. Observation: A green precipitate forms. The precipitate is insoluble in excess sodium hydroxide. Inference: (missing) (Ionic equation…
  16. 2(a)2 marksBased on the observed differences between Figures 2a and 2b, name TWO ions that would most likely be present in the beaker after three days.
  17. 2(b)4 marksWrite ionic equation(s) to show the reactions that take place in the beaker in Figure 2b. Explain why these reactions occur.
  18. 2(c)1 markName the type of chemical reaction occurring in the experiment.
  19. 2(d)(i)6 marksComment on how the RATE OF REACTION might be affected if the zinc nail is replaced by Magnesium metal. Explain your answer. Observation: (missing) Explanation: (missing)
  20. 2(d)(ii)6 marksComment on how the RATE OF REACTION might be affected if the zinc nail is replaced by Lead. Explain your answer. Observation: (missing) Explanation: (missing)
  21. 2(e)(i)1 markState what effect this experimental arrangement will have on the bulb.
  22. 2(e)(ii)2 marksExplain your answer in (e)(i).
  23. 3(a)(i)3 marksName THREE factors OTHER THAN a catalyst, which can affect the rate of a chemical reaction.
  24. 3(a)(ii)2 marksWrite a balanced equation to show the decomposition of hydrogen peroxide by manganese (IV) oxide, MnO₂.
  25. 3(b)(i)2 marksExplain why the plots in Figure 4 are different.
  26. 3(b)(ii)a)5 marksFor 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the quantity of O₂ produced in 16 seconds.
  27. 3(b)(ii)b)5 marksFor 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the number of moles of O₂ produced in 16 seconds. [Atomic mass: O = 16]
  28. 3(b)(ii)c)5 marksFor 0.80 mol dm⁻³ H₂O₂ and 4.0 g of catalyst, determine the volume of O₂ produced at S.T.P. in 16 seconds. [1 mole of gas occupies 22.4 dm³ at S.T.P.]
  29. 3(c)3 marksDraw a fully labelled energy profile diagram to illustrate how the catalyst affects the rate of decomposition of hydrogen peroxide.
  30. 4(a)(i)1 markWhat is meant by the term 'cracking'?
  31. 4(a)(ii)2 marksWrite a balanced equation to illustrate how ethene is formed by the cracking of C₈H₁₈.
  32. 4(b)(i)2 marksWrite a balanced equation to show this reaction.
  33. 4(b)(ii)3 marks1,2-dichloroethane can be decomposed to form chloroethene (CH₂ = CHCl) and hydrogen chloride. Describe a test that can be used to distinguish between 1,2-dichloroethane and chloroethene in the laboratory. Reagent:…
  34. 4(b)(iii)1 markBased on the data in Table 4, suggest a suitable technique that can be used to separate chloroethene from the reaction mixture.
  35. 4(c)(i)2 marksWrite an equation to illustrate how a partial structure of PVC is formed from its monomer, chloroethene.
  36. 4(c)(ii)1 markName the polymerization process which occurs in the formation of PVC.
  37. 4(c)(iii)3 marksName a polymer that is formed by a process which is different from that of PVC, and the type of linkage which occurs in that polymer. Name of polymer: (missing) Type of polymerization process: (missing) Type of linkage:…
  38. 5(a)4 marksComplete Table 5 by writing in the missing information.
  39. 5(b)(i)2 marksUsing the hypothetical symbols A and B, as shown in Table 5, write balanced equations for the reactions between A and air.
  40. 5(b)(ii)2 marksUsing the hypothetical symbols A and B, as shown in Table 5, write balanced equations for the reactions between B and water.
  41. 5(c)3 marksUse a suitable dot cross diagram to show the formation of the bond between B and oxygen.
  42. 5(d)3 marksAccount for the differences between the reactivities of the oxides of the metals A and B.

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