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How can scientists help improve the supply of potable water?: OCR GCSE Combined Science B questions

Every OCR GCSE Combined Science B exam question on C1.4 How can scientists help improve the supply of potable water?, 2018–2025, with its mark scheme and examiner’s report.

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2,688 questions

  1. Q5(a)

    June 2025 · Chemistry Paper 2 Foundation

    6 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 5

  2. Q5(b)(i)

    June 2025 · Chemistry Paper 2 Foundation

    4 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 5

  3. Q5(b)(ii)

    June 2025 · Chemistry Paper 2 Foundation

    4 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 5

  4. Q3(a)(i)

    June 2025 · Chemistry Paper 6 Higher

    4 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 3

  5. Q3(a)(ii)

    June 2025 · Chemistry Paper 6 Higher

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 3

  6. Q3(b)

    June 2025 · Chemistry Paper 6 Higher

    3 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 3

  7. Q3(c)(i)

    June 2025 · Chemistry Paper 6 Higher

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 3

  8. Q3(c)(ii)

    June 2025 · Chemistry Paper 6 Higher

    2 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 3

  9. Q4(a)(i)

    June 2023 · Combined Science Paper 4 Foundation

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  10. Q4(a)(ii)

    June 2023 · Combined Science Paper 4 Foundation

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  11. Q4(b)

    June 2023 · Combined Science Paper 4 Foundation

    6 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  12. Q4(a)

    June 2023 · Combined Science Paper 8 Higher

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  13. Q4(b)(i)

    June 2023 · Combined Science Paper 8 Higher

    2 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  14. Q4(b)(ii)

    June 2023 · Combined Science Paper 8 Higher

    1 markC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  15. Q4(c)

    June 2023 · Combined Science Paper 8 Higher

    2 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  16. Q4(d)

    June 2023 · Combined Science Paper 8 Higher

    4 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  17. Q4(e)

    June 2023 · Combined Science Paper 8 Higher

    4 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  18. Q4(f)

    June 2023 · Combined Science Paper 8 Higher

    3 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
    The start of question 4

  19. Q9(a)

    November 2021 · Combined Science Paper 4 Foundation

    3 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗

  20. Q2(a)

    November 2021 · Combined Science Paper 8 Higher

    3 marksC1.4 How can scientists help improve the supply of potable water?
    The whole paper ↗
All 29 questions on How can scientists help improve the supply of potable water?, as a list
  1. June 2025, Chemistry Paper 2 Foundation, Q5(a) (6 marks): Drinking water in the UK can be obtained from rivers. Rivers are a type of surface water. (a)* The diagram shows some stages of the treatment to make surface wa
  2. June 2025, Chemistry Paper 2 Foundation, Q5(b)(i) (4 marks): Complete the table by identifying the labels, A, B, C, and D on the diagram. Use words from the list. Burette Burner Condenser Funnel Pipette Seawater Thermomet
  3. June 2025, Chemistry Paper 2 Foundation, Q5(b)(ii) (4 marks): Complete the sentences to explain how distillation separates the salt from the water. Put a ring around each correct option. The separation occurs because the s
  4. June 2025, Chemistry Paper 6 Higher, Q3(a)(i) (4 marks): Complete the table to show which impurities are removed and how these impurities are removed at each stage shown. Stage Impurities removed How the impurities ar
  5. June 2025, Chemistry Paper 6 Higher, Q3(a)(ii) (1 mark): Suggest why the water after these stages is still not considered scientifically pure. [1]
  6. June 2025, Chemistry Paper 6 Higher, Q3(b) (3 marks): Some countries get their drinking water from seawater. Seawater contains dissolved salts such as sodium chloride. Distillation can be used to obtain drinking wa
  7. June 2025, Chemistry Paper 6 Higher, Q3(c)(i) (1 mark): The cost of energy is generally lower in countries which can use solar power. Suggest why this means the cost of energy is lower in Country B. Use the table. [1
  8. June 2025, Chemistry Paper 6 Higher, Q3(c)(ii) (2 marks): Explain why country A chooses to use surface water to produce their drinking water. You should refer to water availability and energy use in your answer. [2]
  9. June 2023, Combined Science Paper 4 Foundation, Q4(a)(i) (1 mark): Put a ring around the data point that could be considered an outlier on Fig. 4.1. [1]
  10. June 2023, Combined Science Paper 4 Foundation, Q4(a)(ii) (1 mark): Explain your answer to (a)(i). [1]
  11. June 2023, Combined Science Paper 4 Foundation, Q4(b) (6 marks): Fig. 4.1 shows the relationship between the percentage of population with access to potable water and the number of deaths per 1000 people in the population. Ea
  12. June 2023, Combined Science Paper 8 Higher, Q4(a) (1 mark): Two sources of potable water are waste water and sea water. Identify one other source of potable water. [1]
  13. June 2023, Combined Science Paper 8 Higher, Q4(b)(i) (2 marks): Describe the function of the ‘aeration’ and ‘bacteria added’ stages. [2]
  14. June 2023, Combined Science Paper 8 Higher, Q4(b)(ii) (1 mark): What is the function of the filtration and settlement stages? [1]
  15. June 2023, Combined Science Paper 8 Higher, Q4(c) (2 marks): Describe one way in which potable water can be obtained from sea water. [2]
  16. June 2023, Combined Science Paper 8 Higher, Q4(d) (4 marks): Nina finds a graph (Fig. 4.1) that shows the relationship between the percentage of population with access to potable water and the number of deaths per 1000 pe
  17. June 2023, Combined Science Paper 8 Higher, Q4(e) (4 marks): Chlorine is added to water in some parts of the world because it kills microorganisms in the water. Suggest why scientists in a developing country may have diff
  18. June 2023, Combined Science Paper 8 Higher, Q4(f) (3 marks): Fig. 4.2 shows the number of deaths per 100 000 people due to typhoid fever from 1900 to 1960 in the USA. Typhoid fever is a bacterial infection. It can be spre
  19. November 2021, Combined Science Paper 4 Foundation, Q9(a) (3 marks): Sea water is a solution of salts in water. James has three sets of equipment. They are shown in Fig. 9.1. Sea water Equipment A Sea water Sea water Equipment B
  20. November 2021, Combined Science Paper 8 Higher, Q2(a) (3 marks): Sea water is a solution of salts in water. James has three sets of equipment. They are shown in Fig. 2.1. Sea water Equipment A Sea water Sea water Equipment B
  21. November 2020, Chemistry Paper 2 Foundation, Q2(a) (2 marks): The diagram shows the stages in the treatment of waste water. Bacteria Final Filtration Settlement Aeration added settlement Draw lines to connect each stage wi
  22. November 2020, Chemistry Paper 2 Foundation, Q2(b) (2 marks): Chlorine can also be added to water to make it safe to drink. Describe the test and result to identify chlorine. Test Result [2]
  23. November 2020, Chemistry Paper 2 Foundation, Q2(c)(i) (2 marks): Complete Table 2.1. [2]
  24. November 2020, Chemistry Paper 2 Foundation, Q2(c)(ii) (1 mark): In 1895, the number of people who had typhoid per 100 000 was 25. Plot this data on Fig. 2.1. [1]
  25. November 2020, Chemistry Paper 2 Foundation, Q2(c)(iii) (2 marks): Chlorine was added to the drinking water of the city after 1910. How does the data in Fig. 2.1 show that adding chlorine to the water after 1910 made the water
  26. November 2020, Chemistry Paper 2 Foundation, Q2(d)(i) (1 mark): How does chlorine make the water safe to drink? [1]
  27. November 2020, Chemistry Paper 2 Foundation, Q2(d)(ii) (2 marks): Give one benefit and one risk of adding chlorine to water. Benefit Risk [2]
  28. November 2020, Chemistry Paper 2 Foundation, Q3(e) (2 marks): Sea water contains dissolved sodium chloride. It can be used as a source of drinking water if the dissolved sodium chloride is removed. Which two methods can be
  29. June 2018, Combined Science Paper 4 Foundation, Q1(e) (1 mark): Sodium chloride is more commonly known as salt. In some countries, water contains high levels of salt. The salt has to be removed from the water so people are a

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