Water · CAPE Chemistry Unit 2

46 past-paper questions on Water, part of Industry and the Environment, from every CAPE Chemistry Unit 2 paper on Quelpr.

1. 3(a)(i)1 mark· CAPE Chemistry Unit 2 · 2007 · Paper 2Suggest ONE possible source of phosphate ions found in polluted rivers and lakes.
2. 3(a)(ii)1 mark· CAPE Chemistry Unit 2 · 2007 · Paper 2What observable feature of a polluted lake could result from phosphate concentrations above 1.0 mg dm^-3?
3. 3(a)(iii)1 mark· CAPE Chemistry Unit 2 · 2007 · Paper 2What process is responsible for the observed feature resulting from high phosphate levels?
4. 3(b)(iii)1 mark· CAPE Chemistry Unit 2 · 2007 · Paper 2Based on the results of the analysis, determine whether the concentration of PO4^3- is within acceptable limits.
5. 3(a)(i)3 marks· CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2List THREE human activities, OTHER THAN agricultural, which lead to water pollution.
6. 3(a)(ii)2 marks· CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2State TWO effects of water pollution.
7. 3(b)(i)2 marks· CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2Suggest TWO reasons why farmers need to use chemical fertilisers in crop production.
8. 3(b)(ii)2 marks· CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2Explain how fertilisers cause water pollution.
9. 3(c)6 marks· CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2Describe a simple laboratory test that would confirm the presence of EACH of Pb2+ and NO3- ions in a sample of water.
10. 3(c)(i)1 mark· CAPE Chemistry Unit 2 · 2010 · Paper 2Suggest a precaution you would take to ensure no external contamination occurs when sampling potable water suspected of containing Pb^2+ and NO3^- ions.
11. 3(c)(ii)2 marks· CAPE Chemistry Unit 2 · 2010 · Paper 2Name one reagent used to confirm contamination by Pb^2+ and one reagent to confirm contamination by NO3^-.
12. 3(c)(iii)2 marks· CAPE Chemistry Unit 2 · 2010 · Paper 2State the expected observations for the tests using the reagents named in (c)(ii) if Pb^2+ and NO3^- are present.
13. 6(e)6 marks· CAPE Chemistry Unit 2 · 2010 · Paper 2Complete Table 2 by suggesting one source and one polluting effect for each of the following pollutants: NO3^-, PO4^3-, and Pb^2+.
14. Q381 mark · multiple choice· CAPE Chemistry Unit 2 · 2012 · Paper 1The presence of phosphate ions (\text{PO}_4^{3-}) can be detected using
15. Q371 mark · multiple choice· CAPE Chemistry Unit 2 · 2013 · Paper 1Flocculation is a process involved in the
16. Q401 mark · multiple choice· CAPE Chemistry Unit 2 · 2013 · Paper 1Which of the following ions are significant contributors to eutrophication? I. \text{PO}_4^{3-} II. \text{NO}_3^- III. \text{SO}_4^{2-} IV. \text{Cl}^-
17. Q411 mark · multiple choice· CAPE Chemistry Unit 2 · 2013 · Paper 1The presence of phosphate ions (\text{PO}_4^{3-}) can be detected using
18. 3(a)(i)1 mark· CAPE Chemistry Unit 2 · 2013 · Paper 2State the process that may have led to the transport of pollutants into the stream.
19. 3(a)(ii)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2Identify two sources of pollutants (other than fertilizers) most likely present in the stream.
20. 3(b)(i)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2Describe a laboratory test to identify the presence of nitrates, stating the reagents used and the expected observations.
21. 3(b)(ii)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2Describe a laboratory test to identify the presence of phosphates, stating the reagents used and the expected observations.
22. 3(c)(i)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2State two ways by which dissolved oxygen enters natural waterways.
23. 3(c)(ii)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2Explain how the process of eutrophication causes a decline in water quality.
24. 3(c)(iii)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2Explain why dissolved oxygen must be removed from water prior to use in industrial boilers and pipelines.
25. 3(d)2 marks· CAPE Chemistry Unit 2 · 2013 · Paper 2State two main steps involved in municipal water treatment to produce potable water.
26. Q391 mark · multiple choice· CAPE Chemistry Unit 2 · 2014 · Paper 1Which of the following ions are significant contributors to eutrophication? I. \text{PO}_4^{3-} II. \text{NO}_3^- III. \text{SO}_4^{2-} IV. \text{Cl}^-
27. Q351 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1During an earthquake, household water supply is MOST likely to become polluted by
28. Q371 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1Flocculation is a process involved in the
29. Q421 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1The appearance of a bright red precipitate on the addition of \text{Fe}(\text{NO}_3)_3 to a sample of water indicates the presence of
30. Q451 mark · multiple choice· CAPE Chemistry Unit 2 · 2015 · Paper 1Thermal pollution results in
31. Q391 mark · multiple choice· CAPE Chemistry Unit 2 · 2016 · Paper 1Which of the following chemicals are added to the final product water in the desalination post-treatment stage? I. Lime (\text{Ca(OH)}_2) II. Iron(III) chloride III. Sodium hypochlorite (\text{NaOCl})
32. 3(b)2 marks· CAPE Chemistry Unit 2 · 2016 · Paper 2Outline TWO ways in which other industrial chemicals lead to water pollution.
33. 3(c)(i)2 marks· CAPE Chemistry Unit 2 · 2016 · Paper 2Explain how a named pollutant affects the quality of water for human consumption.
34. 3(c)(ii)2 marks· CAPE Chemistry Unit 2 · 2016 · Paper 2Explain how a named pollutant affects the aquatic environment.
35. 3(d)(i)5 marks· CAPE Chemistry Unit 2 · 2016 · Paper 2Complete Table 2 by outlining simple laboratory tests that would confirm the presence of Pb²⁺ and NO3⁻ in a sample of water.
36. 3(d)(ii)2 marks· CAPE Chemistry Unit 2 · 2016 · Paper 2Write the ionic equation to represent the test on Pb²⁺ in Table 2.
37. Q341 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Item 34 refers to the following test for pollutants on a sample of water. What is the MOST appropriate inference based on the above observation?
38. Q381 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Which of the following methods are used in water purification? I. Distillation II. Filtration III. UV radiation
39. Q451 mark · multiple choice· CAPE Chemistry Unit 2 · 2017 · Paper 1Thermal pollution results in
40. 3(c)5 marks· CAPE Chemistry Unit 2 · 2017 · Paper 2Complete Table 1 by inserting the relevant test and inferences to identify the pollutants.
41. 3(c)(i)3 marks· Chemistry · Unit 2 Q3 3(c)(i)Describe laboratory tests which would confirm the presence of PO4^3-.
42. 3(c)(ii)2 marks· Chemistry · Unit 2 Q3 3(c)(ii)Describe laboratory tests which would confirm the presence of CN-.
43. 3(d)(ii)4 marks· Chemistry · Unit 2 Q3 3(d)(ii)Complete the table below outlining simple laboratory tests that would confirm the presence of Pb²⁺ and NO₃⁻.
44. 3(e)(i)2 marks· Chemistry · Unit 2 Q3 3(e)(i)Describe a qualitative chemical test that can be used in school laboratories to detect the presence of aqueous nitrate ions.
45. 3(e)(ii)2 marks· Chemistry · Unit 2 Q3 3(e)(ii)Compared to the cadmium reduction method, state, with reason, whether the method suggested in (e)(i) is suitable for the determination of nitrate ions as a pollutant in water samples.
46. 3(e)(iii)1 mark· Chemistry · Unit 2 Q3 3(e)(iii)Name the reagent that can be used in school laboratories to detect the presence of phosphate ions.