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CSEC Chemistry · May/June 2014 · Paper 2

44 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)4 marksUse the data from Table 1 to plot a graph of temperature against volume of acid using the axes provided in Figure 1 on page 3. Two of the points have been plotted for you.
  2. 1(a)(ii)1 markFrom the graph in (a)(i), determine the volume of acid required to neutralize 25 cm³ of potassium hydroxide.
  3. 1(a)(iii)1 markDetermine the temperature difference during the reaction.
  4. 1(a)(iv)3 marksCalculate the heat change at the point of neutralization for the reaction between potassium hydroxide and hydrochloric acid. [The specific heat capacity of solution is 4.2 kJkg⁻¹ °C⁻¹. Assume that the density of the…
  5. 1(b)(i)2 marksSuggest a suitable aim for this experiment.
  6. 1(b)(ii)2 marksDescribe what will happen to the contents of Beaker A after 30 seconds.
  7. 1(b)(iii)2 marksWrite a suitable ionic equation for the reaction occurring in Beaker A.
  8. 1(b)(iv)2 marksHow would the contents of Beaker B differ from the contents of Beaker A after each is left for 30 seconds?
  9. 1(b)(v)3 marksExplain your answer in (iv) above.
  10. 1(c)(i)1 markIdentify Solution Y.
  11. 1(c)(ii)3 marksWith reference to Solution Y identified in (i) above, explain the changes that would be observed in Flask 2 if the unknown substance contained the sulfite ion. Expected changes: Explanation:
  12. 1(c)(iii)1 markHow would you modify the experiment to confirm the presence of carbonate instead of the sulfite ion?
  13. 2(a)(i)1 markBased on the position of Element X in the Periodic Table, state whether it would react more vigorously or less vigorously with water than K would react.
  14. 2(a)(ii)1 markWould the solution formed from the reaction of X with water be acidic or basic? Explain your answer.
  15. 2(b)(i)1 markWrite the electronic configuration for magnesium.
  16. 2(b)(ii)1 markBased on the position of Element Q, write the formula for its carbonate. Formula:
  17. 2(b)(iii)2 marksWrite a balanced chemical equation for the reaction of the carbonate of Q with dilute hydrochloric acid. Equation:
  18. 2(c)3 marksSodium reacts with Element Z to form a compound. State whether this compound is ionic or covalent, and explain your answer.
  19. 2(d)(i)1 markWhat visible change would be observed when calcium nitrate decomposes?
  20. 2(d)(ii)3 marksIf 5.0 grams of calcium nitrate are decomposed completely, calculate the volume of nitrogen dioxide produced at RTP. [One mole of a gas occupies 24 000 cm³ at RTP; RMM of Ca(NO₃)₂ = 164]
  21. 3(a)(i)2 marksOrganic molecules can exist as different structural isomers. Define the term 'structural isomers'. Definition:
  22. 3(a)(ii)4 marksMolecules with the formula C₄H₁₀ can exist as structural isomers. In the space provided below, draw FULLY DISPLAYED structures of TWO isomers with formula C₄H₁₀.
  23. 3(b)(i)2 marksDescribe briefly ONE test that could be used to distinguish between Compound A and Compound B. Test: Observation:
  24. 3(b)(ii)2 marksBoth Compound A and Compound B burn in oxygen. Write a balanced chemical equation for the burning of Compound B in excess oxygen. Equation:
  25. 3(b)(iii)2 marksGive ONE use EACH for Compound A and Compound B. Use for Compound A: Use for Compound B:
  26. 3(c)(i)1 markIdentify X.
  27. 3(c)(ii)1 markState the name of Compound D and the homologous series to which it belongs. Name: Homologous series:
  28. 4(a)(i)6 marksWith reference to the bonding, account for the differences in states and melting points of the oxides of magnesium and sulfur.
  29. 4(a)(ii)4 marksExplain whether the oxides will conduct electricity and, if so, under what conditions.
  30. 4(b)(i)1 markWhy is the circuit as represented in Figure 5 not suitable to achieve the aim of the experiment?
  31. 4(b)(ii)2 marksModify the diagram to produce a circuit that is suitable for achieving the aim of this experiment.
  32. 4(b)(iii)2 marksClassify the three substances to be investigated (aqueous lead(II) nitrate, ethanol and aqueous ammonia) EITHER as conductors OR non-conductors.
  33. 5(a)(i)2 marksWrite a balanced equation with state symbols for the reaction that occurs between zinc and the copper(II) sulfate solution.
  34. 5(a)(ii)4 marksExplain why the zinc foil reacted with the copper(II) sulfate solution but the silver foil did not.
  35. 5(a)(iii)2 marksWould aluminium displace copper from the copper(II) sulfate solution? Give a reason for your answer.
  36. 5(b)(i)2 marksList the conditions necessary for the corrosion of iron.
  37. 5(b)(ii)1 markWhy is painting effective in preventing iron from rusting?
  38. 5(c)4 marksExplain why duralumin is used in preference to aluminium for the manufacture of aircraft.
  39. 6(a)4 marksA suggestion of which nutrients the soil could be missing. Give a reason for your suggestion. Suggestion: Reason:
  40. 6(b)2 marksTWO advantages of using organic manure rather than commercial fertilizers.
  41. 6(c)1 markONE disadvantage of using organic manure rather than commercial fertilizers.
  42. 6(d)3 marksA description of a test of soil acidity.
  43. 6(e)2 marksThe chemical name and formula for lime. Advise when lime should be used.
  44. 6(f)3 marksA reason why lime should NOT be added to the soil at the same time as a commercial ammonium fertilizer. Include a balanced chemical equation to support your answer.

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