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Mixtures and Separations · CSEC Chemistry

63 past-paper questions on Mixtures and Separations, part of Principles of Chemistry, from every CSEC Chemistry paper on Quelpr.

Practise Mixtures and Separations
  1. 1(a)(i)3 marks· Chemistry Q1 1(a)(i)recording the temperatures at which the crystals of X reappear in EACH experiment using the information in Figure 1
  2. 1(a)(i)4 marks· Chemistry Q1 1(a)(i)Using the graph paper provided on page 3, plot the data for the solubility of R and T given in Table 1.
  3. 1(a)(i)2 marks· Chemistry Q1 1(a)(i)For EACH temperature in Table 1, calculate the mass of potassium iodide that was dissolved in the beaker of water, and record the value in the space provided.
  4. 1(a)(i)a)5 marks· Chemistry Q1 1(a)(i)a)Complete Table 1 by filling in the temperatures at which crystals of X reappear in EACH experiment using the information in Figure 1.
  5. 1(a)(i)b)5 marks· Chemistry Q1 1(a)(i)b)Complete Table 1 by filling in the corresponding solubilities of X (g/100 g water). Use the following equation to calculate the solubility of X at each temperature: Solubility of X (g/100 g water) = (mass of X / mass of…
  6. 1(a)(ii)1 mark· Chemistry Q1 1(a)(ii)Describe the effect of increasing temperature on the solubilities of R and T.
  7. 1(a)(ii)3 marks· Chemistry Q1 1(a)(ii)On Figure 1, plot mass of salt dissolved (solubility) against temperature, and draw a straight line through the points.
  8. 1(a)(ii)3 marks· Chemistry Q1 1(a)(ii)determining and recording the corresponding values for the solubility of X. [At each temperature, Solubility of X = (mass of X / mass of water) × 100; assume 1 cm³ water = 1 g.]
  9. 1(a)(ii)4 marks· Chemistry Q1 1(a)(ii)Using the graph paper provided on page 4, plot a graph of solubility of X (g/100 g water) against temperature in °C.
  10. 1(a)(iii)1 mark· Chemistry Q1 1(a)(iii)Determine the temperature at which the solubilities of R and T are equal.
  11. 1(a)(iii)1 mark· Chemistry Q1 1(a)(iii)From the graph, determine the solubility (in grams per 100 cm³) of potassium iodide at 70 °C.
  12. 1(a)(iii)2 marks· Chemistry Q1 1(a)(iii)What deduction about the solubility of X can be made from the graph drawn in Figure 2?
  13. 1(a)(iv)1 mark· Chemistry Q1 1(a)(iv)Determine the solubility of T at 75°C.
  14. 1(a)(iv)2 marks· Chemistry Q1 1(a)(iv)100 cm³ of distilled water is saturated with potassium iodide at 70 °C. Calculate the mass of potassium iodide that will be precipitated out from solution, if this solution is then cooled down to 30 °C.
  15. 1(a)(iv)3 marks· Chemistry Q1 1(a)(iv)Using Equation 1 and the graph drawn in Figure 2, calculate the volume of water which is required to just dissolve 2 g of X at 60 °C.
  16. 1(a)(v)1 mark· Chemistry Q1 1(a)(v)Which of the two salts is more soluble at 5°C?
  17. 1(a)(v)1 mark· Chemistry Q1 1(a)(v)Based on the graph in Figure 2, calculate the mass of X which would be deposited when 100 g of a solution of X at 60 °C is cooled to 40 °C.
  18. 1(a)(vi)3 marks· Chemistry Q1 1(a)(vi)Suggest a way for obtaining an essentially pure sample of R from a sample which has been contaminated with a small amount of T.
  19. 1(b)4 marks· Chemistry Q1 1(b)Using the axes on the grid provided on page 5, plot a graph of solubility of X (g/100 g water) against temperature in °C. Draw a best-fit curve through the points plotted.
  20. 1(c)1 mark· Chemistry Q1 1(c)What deduction about the solubility of X can be made from the graph drawn in 1 (b) above?
  21. 1(c)(i)1 mark· Chemistry Q1 1(c)(i)A suggested list of apparatus and chemicals which you will use in obtaining the pure solid sample of EITHER of the two salts.
  22. 1(c)(i)4 marks· Chemistry Q1 1(c)(i)A suggested list of apparatus which you would use in recovering the solid sea salt from the sandy sea water
  23. 1(c)(ii)3 marks· Chemistry Q1 1(c)(ii)An outline of the steps for the procedure to be used.
  24. 1(c)(ii)4 marks· Chemistry Q1 1(c)(ii)An outline of the steps for the procedure you could use
  25. 1(c)(iii)2 marks· Chemistry Q1 1(c)(iii)List the MAIN observations that will be expected at EACH stage of the experiment.
  26. 1(c)(iii)2 marks· Chemistry Q1 1(c)(iii)List the main observations that would be expected at each stage of the experiment.
  27. 1(d)3 marks· Chemistry Q1 1(d)Using the equation given in 1 (a) (ii) and the graph drawn in 1 (b), calculate the minimum volume of water which is required to dissolve 2 g of X at 60 °C.
  28. 1(e)2 marks· Chemistry Q1 1(e)Distinguish between 'a solution' and 'a suspension'.
  29. 2(a)(i)1 mark· Chemistry Q2 2(a)(i)State the name of the process being used in Figure 3 to separate the iodine from sodium chloride.
  30. 2(a)(ii)3 marks· Chemistry Q2 2(a)(ii)Describe what should be observed when the sample of NaCl and I₂ is heated.
  31. 2(b)(i)1 mark· Chemistry Q2 2(b)(i)Which of the two compounds, magnesium chloride or potassium nitrate, has the GREATER solubility at 15 °C?
  32. 2(b)(i)1 mark· Chemistry Q2 2(b)(i)State whether the mixture of curry powder and water is a suspension or colloid.
  33. 2(b)(i)1 mark· Chemistry Q2 2(b)(i)State whether the method outlined in Figure 3 is suitable for separating the Fe from NaCl.
  34. 2(b)(ii)2 marks· Chemistry Q2 2(b)(ii)Calculate the mass of potassium nitrate that would be deposited when its saturated solution is cooled from 80 °C to 20 °C.
  35. 2(b)(ii)1 mark· Chemistry Q2 2(b)(ii)State the MOST appropriate technique that could be used in a school laboratory to separate this mixture.
  36. 2(b)(iii)1 mark· Chemistry Q2 2(b)(iii)Determine the temperature at which the solubilities of magnesium chloride and potassium nitrate are equal.
  37. 2(b)(iii)4 marks· Chemistry Q2 2(b)(iii)Draw 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.
  38. 2(d)3 marks· Chemistry Q2 2(d)State THREE ways in which a colloid differs from a suspension.
  39. 3(a)(iv)2 marks· Chemistry Q3 3(a)(iv)With reference to the properties of ammonia, nitrogen and hydrogen, suggest ONE way that ammonia can be separated from the other gases. Give a reason for your answer.
  40. 4(a)4 marks· Chemistry Q4 4(a)Outline what happens in EACH step.
  41. 4(b)(iii)1 mark· Chemistry Q4 4(b)(iii)Based on the data in Table 4, suggest a suitable technique that can be used to separate chloroethene from the reaction mixture.
  42. 4(c)3 marks· Chemistry Q4 4(c)Based on your knowledge of the solubilities of Compounds X and E, suggest a suitable method of separating E from a mixture of X and E.
  43. 5(a)(i)2 marks· Chemistry Q5 5(a)(i)Identify Process P and Process Q.
  44. 5(a)(ii)1 mark· Chemistry Q5 5(a)(ii)State the importance of the centrifugation process.
  45. 5(a)(iii)1 mark· Chemistry Q5 5(a)(iii)Identify Product X.
  46. 5(a)(iv)2 marks· Chemistry Q5 5(a)(iv)The bagasse produced is used in the factory during the processing of sugar cane. In which part of the factory is this bagasse used and what is it used for?
  47. 5(d)3 marks· Chemistry Q5 5(d)Draw a diagram of the apparatus to show how the products formed from observation (b) (ii) could be separated.
  48. Q181 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1From which of the following substances can a solid be obtained by the process of sedimentation?
  49. Q201 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1Which of the following techniques or processes may be used to separate a mixture of plant pigments?
  50. Q31 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1Which of the following mixtures are arranged in order of INCREASING particle size?
  51. Q41 mark · multiple choice· CSEC Chemistry · January 2019 · Paper 1The salt whose solubility changes to the GREATEST extent in the temperature range 0\ ^\circ\text{C} to 60\ ^\circ\text{C} is
  52. Q161 mark · multiple choice· CSEC Chemistry · May/June 2010 · Paper 1When a saturated solution of copper(II) sulphate is cooled, crystals of copper(II) sulphate-5-water begin to form because solubility of copper(II) sulphate-5-water
  53. Q171 mark · multiple choice· CSEC Chemistry · May/June 2010 · Paper 1A separating funnel can be used to separate a mixture of
  54. Q171 mark · multiple choice· CSEC Chemistry · May/June 2011 · Paper 1A separating funnel can be used to separate a mixture of
  55. Q161 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1From which of the following mixtures can a solid be obtained by the process of sedimentation?
  56. Q171 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1A separating funnel can be used to separate a mixture of
  57. Q591 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1A protein, X, is hydrolysed, using a dilute acid. The BEST method of separating and identifying the products is by
  58. Q151 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1A separating funnel can be used to separate a mixture of
  59. Q111 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1From which of the following substances can a solid be obtained by the process of sedimentation?
  60. Q131 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following statements describes the effect of temperature on the solubility of solids in water?
  61. Q221 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following techniques may be used to separate a mixture of plant pigments into their individual components?
  62. Q111 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1A mixture of copper(II) oxide and copper(II) sulfate is BEST separated by
  63. Q171 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1A separating funnel can be used to separate a mixture of

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