plumiHow can scientists help improve the supply of potable water?: OCR GCSE Chemistry B questions
Every OCR GCSE Chemistry 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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Q6(a)(ii)
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Q2(a)
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Q2(c)(i)
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Q3(a)(ii)
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Q3(a)(ii)
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Q1(a)
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Q1(b)
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The whole paper ↗Q1(c)(iii)
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All 38 questions on How can scientists help improve the supply of potable water?, as a list
- June 2025, Paper 1 Foundation, Q6(a)(ii) (1 mark): The copper hydroxide produced in the reaction is insoluble in water. Name the process used to remove the copper hydroxide from the water. [1]
- June 2025, Paper 2 Foundation, Q2(a) (2 marks): Draw lines to connect each water treatment process with its correct purpose. Water treatment process Purpose Aeration Separates pure water from salt water. Dist
- June 2025, Paper 2 Foundation, Q2(c)(i) (2 marks): Describe what the graph shows about the death rate from typhoid fever in the United States before and after chlorine was first added to drinking water. [2]
- June 2025, Paper 2 Foundation, Q2(c)(ii) (2 marks): A student looks at the graph and has this idea: ‘The graph shows that everyone in the world has had water that is safe to drink since about 1948.’ Suggest two r
- June 2025, Paper 2 Foundation, Q2(d) (2 marks): The effect of adding chlorine to drinking water was an important scientific discovery. Today, information about important scientific discoveries is published fo
- June 2025, Paper 4 Higher, Q3(a)(i) (2 marks): Complete the labels on the diagram. Use all of the words from the list. Heat Pure water Sea water Water in Water out [2]
- June 2025, Paper 4 Higher, Q3(a)(ii) (3 marks): Sea water contains dissolved sodium chloride. A student adds dilute acidified silver nitrate to the sea water before distillation and to the water collected aft
- June 2025, Paper 4 Higher, Q3(b)(i) (2 marks): Chlorine was not added to water in all areas of the United States at the same time. A student says that the time taken for all areas to have chlorine added to t
- June 2025, Paper 4 Higher, Q3(b)(ii) (3 marks): Some people think that chlorine should not be added to drinking water because it causes other health issues such as allergies in some people. Suggest why chlori
- June 2025, Paper 4 Higher, Q3(c) (3 marks): The effect of adding chlorine to drinking water was an important scientific discovery. Today, information about important scientific discoveries is published fo
- June 2024, Paper 1 Foundation, Q3(a)(i) (1 mark): In Process 1 large solid items such as leaves or plastic are removed from the groundwater. Name Process 1. [1]
- June 2024, Paper 1 Foundation, Q3(a)(ii) (3 marks): In Process 4, chlorine is used to kill microorganisms. Describe a test and the result to identify chlorine. Test Result [3]
- June 2024, Paper 1 Foundation, Q3(b)(i) (1 mark): Complete the labels on the diagram. [1]
- June 2024, Paper 1 Foundation, Q3(b)(ii) (2 marks): Describe how the student uses the apparatus to remove some impurities from the groundwater. [2]
- June 2024, Paper 2 Foundation, Q3(c) (1 mark): Another worker says that tap water is already pure because it has been treated to kill bacteria. Explain why tap water is not a pure substance. [1]
- June 2023, Paper 1 Foundation, Q1(a) (1 mark): What is the correct term for drinking water? Tick (3) one box. Ground water Potable water Sea water Waste water [1]
- June 2023, Paper 1 Foundation, Q1(b) (2 marks): One source of drinking water is salt water. Describe a process that separates water from salt water. [2]
- June 2023, Paper 1 Foundation, Q1(c)(i) (1 mark): Why is chlorine added? [1]
- June 2023, Paper 1 Foundation, Q1(c)(ii) (1 mark): Suggest one disadvantage of adding chlorine to drinking water. [1]
- June 2023, Paper 1 Foundation, Q1(c)(iii) (3 marks): Chlorine and other gases can be identified by simple tests. Draw lines to connect each gas with its correct test. It gives a ‘pop’ with a lighted splint. Chlori
- June 2022, Paper 4 Higher, Q8(a) (2 marks): Before she sets up the cell, Beth tests each gas to check its identity. Describe the tests and the results for hydrogen and oxygen gas. hydrogen test result oxy
- November 2021, Paper 1 Foundation, Q8(a) (1 mark): How does chlorine make water safe to drink? [1]
- November 2021, Paper 1 Foundation, Q8(b) (2 marks): James has a solution of chlorine in water. He tests the solution with blue litmus paper. State two colour changes that James will see. 1 2 [2]
- November 2021, Paper 3 Higher, Q1(a) (1 mark): How does chlorine make water safe to drink? [1]
- November 2020, Paper 2 Foundation, Q9(b)(i) (1 mark): If glass bottles are used instead of PET bottles, the bacteria are not killed. Suggest why bacteria in water in a glass bottle are not killed. [1]
- November 2020, Paper 2 Foundation, Q9(b)(ii) (1 mark): In the UK, bacteria in drinking water are killed by adding a substance to the water. Name this substance. [1]
- November 2020, Paper 4 Higher, Q1(b)(i) (1 mark): If glass bottles are used instead of PET bottles, the bacteria are not killed. Suggest why bacteria in water in a glass bottle are not killed. [1]
- November 2020, Paper 4 Higher, Q1(b)(ii) (1 mark): In the UK, bacteria in drinking water are killed by adding a substance to the water. Name this substance. [1]
- June 2019, Paper 1 Foundation, Q1(a) (1 mark): Choose the test for chlorine. Tick (3) one box. Makes a ‘pop’ with a lighted splint. Relights a glowing splint. Turns blue litmus red and then white. Turns lime
- June 2019, Paper 1 Foundation, Q1(b) (3 marks): Choose words from the list below to complete the sentences. You may use each word once, more than once, or not at all. animals diseases microorganisms smelly to
- June 2019, Paper 3 Higher, Q9(a) (2 marks): Chlorine is added to water to make it fit to drink. The test for chlorine gas relies on two properties of chlorine. Put a ring around the two correct answers. a
- June 2019, Paper 3 Higher, Q9(b)(i) (2 marks): Explain why chlorine is added to drinking water. [2]
- June 2019, Paper 3 Higher, Q9(b)(ii) (1 mark): Give one risk of adding chlorine to drinking water. [1]
- June 2018, Paper 2 Foundation, Q3(a) (2 marks): A distillation process is used to produce fresh water. Statements A–G describe some correct and some incorrect stages in the distillation process. A Cold water
- June 2018, Paper 2 Foundation, Q3(b)(i) (2 marks): Chlorine is used to treat drinking water before it is sent to homes. The waste water from homes is treated with oxygen. The table shows some information about o
- June 2018, Paper 4 Higher, Q3(a)(i) (3 marks): Which stage removes the salt from the seawater? Explain your answer. Stage Explanation [3]
- June 2018, Paper 4 Higher, Q3(a)(ii) (2 marks): Explain why there are no harmful bacteria in the water after stage 2. [2]
- June 2018, Paper 4 Higher, Q3(a)(iii) (1 mark): Explain why stage 3 is needed. [1]
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