plumiWater treatment: Edexcel GCSE Combined Science questions
Every Edexcel GCSE Combined Science exam question on Water treatment (specification points 2.12), 2018–2025, with its mark scheme and examiner’s report.
Paper
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Exam
All years
Calculations
Q2(a)
The whole paper ↗Q2(b)(ii)
The whole paper ↗Q2(b)(iii)
The whole paper ↗Q2(c)(i)
The whole paper ↗Q2(c)(ii)
The whole paper ↗Q2(a)(i)
The whole paper ↗Q2(a)(ii)
The whole paper ↗Q2(a)(iii)
The whole paper ↗Q2(a)(iv)
The whole paper ↗Q2(b)(i)
The whole paper ↗Q2(b)(ii)
The whole paper ↗Q2(a)
The whole paper ↗Q2(b)(i)
The whole paper ↗Q2(b)(ii)
The whole paper ↗Q2(b)(iii)
The whole paper ↗Q2(c)
The whole paper ↗Q2(d)
The whole paper ↗Q6(a)
The whole paper ↗Q6(b)(i)
The whole paper ↗Q6(b)(ii)
The whole paper ↗
All 23 questions on Water treatment, as a list
- June 2024, Chemistry Paper 1 Foundation, Q2(a) (2 marks): Water treatment includes the processes of chlorination, filtration and sedimentation. Place these processes in the order that they take place during water treat
- June 2024, Chemistry Paper 1 Foundation, Q2(b)(ii) (1 mark): Why is chlorine added to water during water treatment? (1) A to clean the water B to dissolve insoluble substances in the water C to increase the pH of the wate
- June 2024, Chemistry Paper 1 Foundation, Q2(b)(iii) (1 mark): State why tap water is not suitable for use in chemical analysis. (1)
- June 2024, Chemistry Paper 1 Foundation, Q2(c)(i) (2 marks): The student made an error when setting up the apparatus in Figure 4. This error meant that pure water could not be collected in the test tube. Explain what the
- June 2024, Chemistry Paper 1 Foundation, Q2(c)(ii) (1 mark): State what the student should use to heat the water. (1)
- June 2022, Chemistry Paper 1 Foundation, Q2(a)(i) (1 mark): Which row of the table shows these three processes in the order in which they are carried out? (1) first second third A chlorination sedimentation filtration B
- June 2022, Chemistry Paper 1 Foundation, Q2(a)(ii) (1 mark): State the reason why chlorine is added during the water treatment. (1)
- June 2022, Chemistry Paper 1 Foundation, Q2(a)(iii) (2 marks): Describe how sedimentation is carried out. (2)
- June 2022, Chemistry Paper 1 Foundation, Q2(a)(iv) (2 marks): Figure 3 shows the results of an analysis of a sample of potable water. ion concentration in mg dm−3 chloride 60.70 fluoride 0.24 nitrate 24.90 sulfate 71.40 co
- June 2022, Chemistry Paper 1 Foundation, Q2(b)(i) (1 mark): Name the piece of equipment labelled X in Figure 4. (1)
- June 2022, Chemistry Paper 1 Foundation, Q2(b)(ii) (2 marks): The student made an error when setting up the equipment in Figure 4. This error meant no water could be collected in the test tube. Explain what the student nee
- November 2021, Chemistry Paper 1 Higher, Q2(a) (1 mark): A sample of potable water contains impurities. Why is this sample of water potable even though it contains impurities? (1) A the impurities have no smell B the
- November 2021, Chemistry Paper 1 Higher, Q2(b)(i) (1 mark): What is sedimentation? (1) A the waste water is heated so the impurities evaporate B the waste water has an acid added to remove impurities C the impurities in
- November 2021, Chemistry Paper 1 Higher, Q2(b)(ii) (1 mark): State why the waste water is filtered. (1)
- November 2021, Chemistry Paper 1 Higher, Q2(b)(iii) (1 mark): State the reason for chlorination. (1)
- November 2021, Chemistry Paper 1 Higher, Q2(c) (3 marks): Some salts can be added to waste water to remove impurities. In an experiment, different masses of salt A were added to 1000cm3 samples of waste water. The expe
- November 2021, Chemistry Paper 1 Higher, Q2(d) (2 marks): Waste water may contain phosphate ions, PO4 3-. Aluminium ions react with phosphate ions to form aluminium phosphate. Complete the ionic equation for the format
- November 2021, Chemistry Paper 1 Foundation, Q6(a) (1 mark): A sample of potable water contains impurities. Why is this sample of water potable even though it contains impurities? (1) A the impurities have no smell B the
- November 2021, Chemistry Paper 1 Foundation, Q6(b)(i) (1 mark): What is sedimentation? (1) A the waste water is heated so the impurities evaporate B the waste water has an acid added to remove impurities C the impurities in
- November 2021, Chemistry Paper 1 Foundation, Q6(b)(ii) (1 mark): State why the waste water is filtered. (1)
- November 2021, Chemistry Paper 1 Foundation, Q6(b)(iii) (1 mark): State the reason for chlorination. (1)
- November 2021, Chemistry Paper 1 Foundation, Q6(c) (3 marks): Some salts can be added to waste water to remove impurities. In an experiment, different masses of salt A were added to 1000cm3 samples of waste water. The expe
- November 2021, Chemistry Paper 1 Foundation, Q6(d) (6 marks): A sample of water was contaminated with a dissolved solid. Devise a plan to separate pure water from this mixture, including a test to show that the water obtai
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