plumiCombustion, pollution and fuels: Edexcel GCSE Combined Science questions
Every Edexcel GCSE Combined Science exam question on Combustion, pollution and fuels (specification points 8.7–8.14), 2018–2025, with its mark scheme and examiner’s report.
Paper
All papers
Exam
All years
Calculations
Q5(c)
The whole paper ↗Q3(b)
The whole paper ↗Q3(c)
The whole paper ↗Q4(b)(i)
The whole paper ↗Q4(b)(ii)
The whole paper ↗Q3(c)
The whole paper ↗Q3(c)
The whole paper ↗Q3(d)(i)
The whole paper ↗Q3(d)(ii)
The whole paper ↗Q6(c)
The whole paper ↗Q3(a)(i)
The whole paper ↗Q3(a)(ii)
The whole paper ↗Q3(b)(iii)
The whole paper ↗Q2(c)
The whole paper ↗Q6(a)(i)
The whole paper ↗Q6(a)(ii)
The whole paper ↗Q6(d)
The whole paper ↗Q6(c)
The whole paper ↗Q6(e)
The whole paper ↗Q6(a)
The whole paper ↗
All 26 questions on Combustion, pollution and fuels, as a list
- June 2025, Chemistry Paper 2 Higher, Q5(c) (2 marks): A Bunsen burner burns methane gas, CH4. A student investigates the time taken to heat up a beaker of water using this Bunsen burner. Figure 5 shows the apparatu
- June 2024, Chemistry Paper 2 Higher, Q3(b) (4 marks): A fossil fuel contains carbon and sulfur. Explain how the products of the complete combustion of this fossil fuel would affect the environment. (4)
- June 2024, Chemistry Paper 2 Higher, Q3(c) (2 marks): Incomplete combustion of fuels may produce carbon monoxide. Write the balanced equation for the incomplete combustion of heptane, C7H16 , where all of the carbo
- June 2024, Chemistry Paper 2 Higher, Q4(b)(i) (2 marks): When hydrocarbon fuels are burned, the products are water and carbon dioxide. Describe what needs to be done to the apparatus in Figure 5 to collect the water a
- June 2024, Chemistry Paper 2 Higher, Q4(b)(ii) (4 marks): A hydrocarbon, CxHy , is burned in excess oxygen, forming 26.4 g of carbon dioxide and 5.4 g of water. The relative formula mass of CxHy is 78. Calculate the mo
- June 2024, Chemistry Paper 2 Foundation, Q3(c) (3 marks): When some impure hydrocarbon fuels are burned, sulfur dioxide is one of the products. Some sulfur dioxide gas is dissolved in water to form solution W. When sol
- June 2023, Chemistry Paper 2 Higher, Q3(c) (3 marks): Acid rain is caused by some pollutant gases present in the atmosphere. Explain how impurities in fossil fuels can result in acid rain. (3)
- June 2023, Chemistry Paper 2 Higher, Q3(d)(i) (1 mark): State what piece of equipment the student could use to measure the pH of each liquid. (1)
- June 2023, Chemistry Paper 2 Higher, Q3(d)(ii) (2 marks): Explain one improvement that the student could make to the method to make the results more valid. (2)
- June 2023, Chemistry Paper 2 Higher, Q6(c) (6 marks): Large quantities of methane are used as a fuel. Figure 11 shows a Bunsen burner. Methane can be used as fuel for the Bunsen burner. chimney air-hole Figure 11 T
- June 2022, Chemistry Paper 2 Higher, Q3(a)(i) (2 marks): Give two ways in which the data in Figure 4 shows that the diesel engine is more damaging to the environment than the petrol engine. (2)
- June 2022, Chemistry Paper 2 Higher, Q3(a)(ii) (2 marks): Explain, using information from Figure 4, one way in which the diesel engine is less damaging to the environment than the petrol engine. (2)
- June 2022, Chemistry Paper 2 Higher, Q3(b)(iii) (3 marks): Write the balanced equation for the complete combustion of octane, C8H18. (3)
- November 2021, Chemistry Paper 2 Higher, Q2(c) (2 marks): When fuels such as diesel oil are burned, the high temperatures produced can cause nitrogen and oxygen in the air to form the pollutant nitrogen dioxide. Comple
- November 2021, Chemistry Paper 2 Higher, Q6(a)(i) (2 marks): Explain why the incomplete combustion of pentadecane can produce carbon monoxide as one of the products. (2)
- November 2021, Chemistry Paper 2 Higher, Q6(a)(ii) (2 marks): Explain how carbon monoxide behaves as a toxic gas. (2)
- November 2021, Chemistry Paper 2 Higher, Q6(d) (2 marks): Methane gas, CH4 , was burned using the apparatus shown in Figure 10. burning methane cold water methane gas → water droplets Figure 10 Explain why water drople
- November 2021, Chemistry Paper 2 Foundation, Q6(c) (2 marks): When fuels such as diesel oil are burned, the high temperatures produced can cause nitrogen and oxygen in the air to form the pollutant nitrogen dioxide. Comple
- November 2021, Chemistry Paper 2 Foundation, Q6(e) (6 marks): Diesel oil can contain impurities of sulfur. Burning diesel oil containing impurities of sulfur can result in acid rain. Acid rain is harmful to the environment
- November 2020, Chemistry Paper 2 Higher, Q6(a) (3 marks): An impure hydrocarbon fuel is burned in the apparatus in Figure 5. tube A tube B to pump impure funnel indicator hydrocarbon solution fuel ice Figure 5 When the
- November 2020, Chemistry Paper 2 Higher, Q6(c) (6 marks): Petrol and diesel are used as fuels for cars. The emissions from three similar sized cars were investigated. The first car was the oldest, had no catalytic conv
- November 2020, Chemistry Paper 2 Foundation, Q4(a)(i) (2 marks): Complete the word equation for the complete combustion of methane in oxygen. (2) methane + → water +
- November 2020, Chemistry Paper 2 Foundation, Q4(a)(ii) (1 mark): The incomplete combustion of methane can produce carbon and carbon monoxide. Give the reason why carbon and carbon monoxide are produced in the incomplete combu
- June 2019, Chemistry Paper 2 Foundation, Q5(c)(iii) (2 marks): Butane burns completely in air to form carbon dioxide and water. Write the word equation for this reaction. (2)
- June 2018, Chemistry Paper 2 Foundation, Q4(b)(i) (1 mark): Substance C can be formed by burning an element in oxygen. Write the word equation for this reaction. (1)
- June 2018, Chemistry Paper 2 Foundation, Q4(b)(ii) (1 mark): Consider substances A, B, and D. Give the letters of the two substances that can be formed by burning an element in oxygen. (1)
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