plumiPure substances and separating mixtures: Edexcel GCSE Combined Science questions
Every Edexcel GCSE Combined Science exam question on Pure substances and separating mixtures (specification points 2.5–2.8), 2018–2025, with its mark scheme and examiner’s report.
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Calculations
Q3(b)(iii)
The whole paper ↗Q2(b)(i)
The whole paper ↗Q2(b)(ii)
The whole paper ↗Q6(a)(iii)
The whole paper ↗Q6(a)(ii)
The whole paper ↗Q6(c)
The whole paper ↗Q5(c)
The whole paper ↗Q5(e)
The whole paper ↗Q1(b)(i)
The whole paper ↗Q3(a)(i)
The whole paper ↗Q3(a)(ii)
The whole paper ↗Q1(a)
The whole paper ↗Q3(c)
The whole paper ↗Q2(a)
The whole paper ↗Your answerQ2(b)(i)
The whole paper ↗Q2(b)(ii)
The whole paper ↗Q3(b)(i)
The whole paper ↗Q3(b)(ii)
The whole paper ↗Q4(b)(i)
The whole paper ↗Q4(b)(ii)
The whole paper ↗
All 21 questions on Pure substances and separating mixtures, as a list
- June 2025, Chemistry Paper 1 Higher, Q3(b)(iii) (1 mark): The mixture of liquid nitrogen and liquid oxygen can be separated. Which process could be used to separate a mixture of liquid nitrogen and liquid oxygen? (1) A
- June 2025, Chemistry Paper 1 Foundation, Q2(b)(i) (1 mark): Name the piece of apparatus labelled R in Figure 4. (1)
- June 2025, Chemistry Paper 1 Foundation, Q2(b)(ii) (2 marks): Explain the purpose of the piece of apparatus labelled Q in Figure 4. (2)
- June 2025, Chemistry Paper 1 Foundation, Q6(a)(iii) (3 marks): State and explain how the white precipitate can be separated from the reaction mixture. (3)
- June 2023, Chemistry Paper 1 Higher, Q6(a)(ii) (3 marks): The melting points of three samples of S are shown in Figure 6. sample melting point in °C A 160–164 B 166 C 163–165 Figure 6 State whether each of these sample
- June 2023, Chemistry Paper 1 Higher, Q6(c) (6 marks): A solution of sodium chloride in water needs to be separated to obtain a sample of pure, dry sodium chloride and a sample of pure water. Figure 7 shows the boil
- November 2021, Chemistry Paper 1 Higher, Q5(c) (1 mark): Titanium is extracted from its ore in several stages. In the first stage, titanium chloride is formed as a gas. The gas is cooled to form liquid titanium chlori
- November 2021, Chemistry Paper 1 Higher, Q5(e) (2 marks): After this reaction, there is a mixture of the solids magnesium, titanium and magnesium chloride. Titanium does not react with dilute hydrochloric acid. Suggest
- November 2021, Chemistry Paper 1 Foundation, Q1(b)(i) (2 marks): Explain why this drinking water should not be described as pure water. (2)
- November 2020, Chemistry Paper 1 Higher, Q3(a)(i) (2 marks): Draw a labelled diagram of the apparatus used to filter the mixture and collect the sodium chloride solution. (2)
- November 2020, Chemistry Paper 1 Higher, Q3(a)(ii) (3 marks): Describe how a sample of pure, dry sodium chloride crystals can be obtained from the filtrate. (3)
- November 2020, Chemistry Paper 1 Foundation, Q1(a) (1 mark): When solid sodium chloride is mixed with water, sodium chloride solution forms. What name is given to the process of mixing a solid with water to form a solutio
- June 2019, Chemistry Paper 1 Higher, Q3(c) (3 marks): In a different method of obtaining nickel, the process produces a mixture of the liquids nickel tetracarbonyl and iron pentacarbonyl. The boiling point of nicke
- June 2019, Chemistry Paper 1 Foundation, Q2(a) (1 mark): Which of the following is a mixture of substances? (1) A air B carbon dioxide C gold D titanium
- June 2019, Chemistry Paper 1 Foundation, Q2(b)(i) (1 mark): One mistake is that the bulb of the thermometer is too low. The bulb of the thermometer should be level with the side arm. Give a reason why the bulb of the the
- June 2019, Chemistry Paper 1 Foundation, Q2(b)(ii) (1 mark): State one other mistake in Figure 3. (1)
- June 2018, Chemistry Paper 1 Higher, Q3(b)(i) (2 marks): Explain how the water in sea water separates to produce the pure water in this apparatus. (2)
- June 2018, Chemistry Paper 1 Higher, Q3(b)(ii) (2 marks): Explain how the apparatus could be improved to increase the amount of pure water collected from the same volume of sea water. (2)
- June 2018, Chemistry Paper 1 Foundation, Q4(b)(i) (1 mark): Cold water flows through the condenser. On Figure 6 use arrows to show where the water should flow in and where it should flow out. (1)
- June 2018, Chemistry Paper 1 Foundation, Q4(b)(ii) (2 marks): Explain why a condenser is used. (2)
- June 2018, Chemistry Paper 1 Foundation, Q4(b)(iii) (1 mark): The flask was heated with a Bunsen burner. Give the name of an alternative piece of apparatus that could be used to heat the flask. (1)
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