Quelpr

CSEC Chemistry · January 2012 · Paper 2

48 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)2 marksDefine the term 'heat of neutralization'.
  2. 1(a)(ii)3 marksUse the data in Table 1 to plot a graph of temperature against volume of acid for Experiment 1 using the axes provided on page 5. The first two points have been plotted for you.
  3. 1(a)(iii)1 markFrom the graph, determine the volume of sulphuric acid required to completely neutralize 25 cm³ of sodium hydroxide.
  4. 1(a)(iv)3 marksGiven that the difference in temperature from the start of the reaction to the point of neutralization is 18 °C, calculate the heat change at the point of neutralization for the reaction between sodium hydroxide and…
  5. 1(b)(i)2 marksDefine the term 'heat of solution'.
  6. 1(b)(ii)1 markFigure 2 shows the thermometer readings for the initial and final temperatures obtained for Experiment 2. Record the reading, in °C, on each thermometer in the space provided.
  7. 1(b)(iii)3 marksWrite a suitable procedure that could be carried out for Experiment 2.
  8. 1(b)(iv)3 marksDraw a labelled energy profile diagram for the reaction taking place in Experiment 2.
  9. 1(c)(i)2 marksWrite a balanced half-equation to represent the change which takes place when Solution X reacts with aqueous iron(II) nitrate.
  10. 1(c)(ii)3 marksExplain whether Solution X is behaving as a reducing agent, an oxidizing agent or both.
  11. 1(c)(iii)2 marksDescribe Observation 3 as indicated in Table 2.
  12. 2(a)2 marksAssuming that the limestone granules are pure calcium carbonate, write a balanced equation for its reaction with hydrochloric acid.
  13. 2(b)(i)1 markUse the data from Figure 3 to determine the total volume of gas produced.
  14. 2(b)(ii)1 markto calculate the moles of gas produced at STP [1 mole of any gas at STP has a volume of 22 400 cm³.]
  15. 2(b)(iii)2 marksto calculate the mass of limestone granules used. [Relative molecular mass of CaCO₃ is 100.]
  16. 2(c)(i)1 markWhat is meant by the term 'rate of reaction'?
  17. 2(c)(ii)2 marksBesides temperature, identify TWO other factors that can affect the rate of the reaction.
  18. 2(c)(iii)a)1 markIf the temperature at which the reaction was carried out was changed from 25 °C to 40 °C, would the rate of reaction increase or decrease?
  19. 2(c)(iii)b)2 marksExplain your answer.
  20. 2(d)(i)1 markIs it LIKELY that calcium carbonate will conduct electricity in its solid state?
  21. 2(d)(ii)2 marksGive a reason for your answer.
  22. 3(a)2 marksHydrocarbons are compounds that contain the elements, hydrogen and carbon. Name TWO natural sources of hydrocarbons.
  23. 3(b)(i)1 markState the name of Fraction 1 OR Fraction 3. Fraction number: Fraction name:
  24. 3(b)(ii)1 markState ONE use of Fraction 2.
  25. 3(c)(i)1 markState the name of Compound X and the homologous series to which it belongs. Name of Compound X: Homologous series:
  26. 3(c)(ii)2 marksWrite the FULLY DISPLAYED structural formulae of the two molecules that are produced when Compound X is hydrolysed.
  27. 3(d)(i)a)1 markName a polymer of glucose. Name of polymer:
  28. 3(d)(i)b)2 marksUsing three glucose units, draw the partial structure of the polymer in the space provided.
  29. 3(d)(ii)2 marksState the expected observations in EACH case. Glucose: Polymer:
  30. 3(e)1 markName the type of polymer formed and give ONE use for this type of polymer. Type of polymer: Use:
  31. 4(a)(i)2 marksWrite the electronic configuration of sodium and state a reason for its placement in Period 3.
  32. 4(a)(ii)a)2 marksWrite a balanced equation for the reaction of sodium with water.
  33. 4(a)(ii)b)2 marksOutline ONE test that can be used to identify any gas that is produced during the reaction.
  34. 4(a)(ii)c)1 markPredict the reactivity of X with water as compared with sodium and potassium.
  35. 4(a)(iii)2 marksGive ONE test that can be used to distinguish the solution of the oxide of Element Y from the solution of the oxide of sulphur.
  36. 4(b)(i)4 marksWrite a balanced IONIC equation for the overall reaction, and identify the species being oxidised and reduced.
  37. 4(b)(ii)2 marksAccount for the difference in reactivity of chlorine and iodine towards iron(II).
  38. 5(a)(i)6 marksDescribe the process for obtaining iron from its ore. In your description, identify the materials used and include a chemical equation to show how iron is produced.
  39. 5(a)(ii)1 markCarbon and carbon monoxide are both able to reduce the oxide ore to produce iron. Suggest a suitable explanation why carbon monoxide is used to reduce the iron ore instead of carbon.
  40. 5(b)(i)a)4 marksWrite suitable equations for the action of heat on the hydroxide of M.
  41. 5(b)(i)b)4 marksWrite suitable equations for the action of heat on the nitrate of M.
  42. 5(b)(ii)3 marksSuggest a suitable method for extracting Metal M from its ore and explain your answer.
  43. 5(b)(iii)1 markSuggest ONE chemical property of Metal M.
  44. 6(a)(i)2 marksDiscuss the role of Water in the making of dough:
  45. 6(a)(ii)2 marksDiscuss the role of Leavening agent (baking powder and yeast) in the making of dough:
  46. 6(a)(iii)2 marksDiscuss the role of Heat in the making of dough:
  47. 6(b)6 marksWrite THREE relevant chemical equations to support your answer in (a). Include AT LEAST ONE equation from the action of yeast and ONE from the action of baking powder.
  48. 6(c)3 marksSuggest a possible explanation for this.

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