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Carbon compounds as fuels and feedstock: AQA GCSE Combined Science questions

Every AQA GCSE Combined Science exam question on 5.7.1 Carbon compounds as fuels and feedstock, 2018–2025, with its mark scheme and examiner’s report.

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3,069 questions

  1. Q01.1

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 01.1: The general formula for alkanes is CnH2n+2 A molecule of dodecane has 12 carbon atoms. Complete the formula of dodecane. [1 mark] C H A student investigated the

  2. Q01.2

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 01.2: The student used a water bath to heat the dodecane. Suggest one reason why the student used a water bath instead of a Bunsen burner to heat the dodecane. [1 mar

  3. Q01.3

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 01.3: Give one control variable used in the investigation. [1 mark] Figure 2 shows the results. Figure 2

  4. Q01.4

    June 2025 · Chemistry Paper 2 Higher

    2 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 01.4: Predict the time taken to collect 40 cm3 of dodecane at 75 °C. You should extend the line of best fit on Figure 2. [2 marks] Time taken = s

  5. Q01.5

    June 2025 · Chemistry Paper 2 Higher

    2 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 01.5: The higher the viscosity, the slower dodecane flows. Explain how the trend in Figure 2 shows the effect of an increase in temperature on the viscosity of dodeca

  6. Q03.1

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock5.10.1 Using the Earth's resources and obtaining potable water
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.1: What is meant by a ‘finite’ resource? [1 mark]

  7. Q03.2

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.2: Most of the compounds in crude oil are hydrocarbons. Define the term ‘hydrocarbon’. [1 mark]

  8. Q03.3

    June 2025 · Chemistry Paper 2 Higher

    4 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.3: Crude oil found in different areas has different compositions. Table 2 shows the percentage (%) composition of crude oil from one area. Table 2 Fraction Percent

  9. Q03.4

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.4: Fractions from crude oil can be processed to produce many useful materials by the petrochemical industry. Which is a useful material produced by the petrochemic

  10. Q03.5

    June 2025 · Chemistry Paper 2 Higher

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.5: Catalytic cracking is used to crack hydrocarbons. Name one other method of cracking hydrocarbons. [1 mark]

  11. Q03.6

    June 2025 · Chemistry Paper 2 Higher

    2 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Higher, question 03.6: Alkanes are produced by cracking. Hydrocarbon Z is a different type of hydrocarbon to alkanes. Hydrocarbon Z: • is also produced by cracking • can be used to pr

  12. Q01.1

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 01.1: What is crude oil produced from? [1 mark] Tick () one box. Microbes Plankton Water

  13. Q01.2

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 01.2: Most of the compounds in crude oil are made of carbon and hydrogen atoms only. What name is given to compounds made of carbon and hydrogen atoms only? [1 mark]

  14. Q01.3

    June 2025 · Chemistry Paper 2 Foundation

    3 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 01.3: Crude oil found in different areas has different compositions. Table 1 shows the percentage (%) composition of crude oil from two different areas. Table 1 Perce

  15. Q01.4

    June 2025 · Chemistry Paper 2 Foundation

    3 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 01.4: Calculate the volume of kerosene in 160 dm3 of crude oil from area C. Give your answer to 2 significant figures. Use Table 2. [3 marks] Volume (2 significant fi

  16. Q01.5

    June 2025 · Chemistry Paper 2 Foundation

    3 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 01.5: Complete Figure 1. You should: • complete the scale for the y-axis • plot the data for kerosene and for petrol from Table 2 • label the bars for kerosene and fo

  17. Q04.6

    June 2025 · Chemistry Paper 2 Foundation

    2 marks5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 04.6: A high temperature is used for cracking alkanes. Which two of the following can also be used to crack alkanes? [2 marks] Tick () two boxes. A catalyst A solven

  18. Q04.7

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 04.7: Which chemical is used to test for alkenes? [1 mark] Tick () one box. Ammonia Bromine water Copper sulfate Nitrogen

  19. Q05.1

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 05.1: The general formula for alkanes is CnH2n+2 A molecule of dodecane has 12 carbon atoms. Complete the formula of dodecane. [1 mark] C H A student investigated the

  20. Q05.2

    June 2025 · Chemistry Paper 2 Foundation

    1 mark5.7.1 Carbon compounds as fuels and feedstock
    The whole paper ↗
    June 2025 Chemistry Paper 2 Foundation, question 05.2: The student used a water bath to heat the dodecane. Suggest one reason why the student used a water bath instead of a Bunsen burner to heat the dodecane. [1 mar
All 94 questions on Carbon compounds as fuels and feedstock, as a list
  1. June 2025, Chemistry Paper 2 Higher, Q01.1 (1 mark): The general formula for alkanes is CnH2n+2 A molecule of dodecane has 12 carbon atoms. Complete the formula of dodecane. [1 mark] C H A student investigated the
  2. June 2025, Chemistry Paper 2 Higher, Q01.2 (1 mark): The student used a water bath to heat the dodecane. Suggest one reason why the student used a water bath instead of a Bunsen burner to heat the dodecane. [1 mar
  3. June 2025, Chemistry Paper 2 Higher, Q01.3 (1 mark): Give one control variable used in the investigation. [1 mark] Figure 2 shows the results. Figure 2
  4. June 2025, Chemistry Paper 2 Higher, Q01.4 (2 marks): Predict the time taken to collect 40 cm3 of dodecane at 75 °C. You should extend the line of best fit on Figure 2. [2 marks] Time taken = s
  5. June 2025, Chemistry Paper 2 Higher, Q01.5 (2 marks): The higher the viscosity, the slower dodecane flows. Explain how the trend in Figure 2 shows the effect of an increase in temperature on the viscosity of dodeca
  6. June 2025, Chemistry Paper 2 Higher, Q03.1 (1 mark): What is meant by a ‘finite’ resource? [1 mark]
  7. June 2025, Chemistry Paper 2 Higher, Q03.2 (1 mark): Most of the compounds in crude oil are hydrocarbons. Define the term ‘hydrocarbon’. [1 mark]
  8. June 2025, Chemistry Paper 2 Higher, Q03.3 (4 marks): Crude oil found in different areas has different compositions. Table 2 shows the percentage (%) composition of crude oil from one area. Table 2 Fraction Percent
  9. June 2025, Chemistry Paper 2 Higher, Q03.4 (1 mark): Fractions from crude oil can be processed to produce many useful materials by the petrochemical industry. Which is a useful material produced by the petrochemic
  10. June 2025, Chemistry Paper 2 Higher, Q03.5 (1 mark): Catalytic cracking is used to crack hydrocarbons. Name one other method of cracking hydrocarbons. [1 mark]
  11. June 2025, Chemistry Paper 2 Higher, Q03.6 (2 marks): Alkanes are produced by cracking. Hydrocarbon Z is a different type of hydrocarbon to alkanes. Hydrocarbon Z: • is also produced by cracking • can be used to pr
  12. June 2025, Chemistry Paper 2 Foundation, Q01.1 (1 mark): What is crude oil produced from? [1 mark] Tick () one box. Microbes Plankton Water
  13. June 2025, Chemistry Paper 2 Foundation, Q01.2 (1 mark): Most of the compounds in crude oil are made of carbon and hydrogen atoms only. What name is given to compounds made of carbon and hydrogen atoms only? [1 mark]
  14. June 2025, Chemistry Paper 2 Foundation, Q01.3 (3 marks): Crude oil found in different areas has different compositions. Table 1 shows the percentage (%) composition of crude oil from two different areas. Table 1 Perce
  15. June 2025, Chemistry Paper 2 Foundation, Q01.4 (3 marks): Calculate the volume of kerosene in 160 dm3 of crude oil from area C. Give your answer to 2 significant figures. Use Table 2. [3 marks] Volume (2 significant fi
  16. June 2025, Chemistry Paper 2 Foundation, Q01.5 (3 marks): Complete Figure 1. You should: • complete the scale for the y-axis • plot the data for kerosene and for petrol from Table 2 • label the bars for kerosene and fo
  17. June 2025, Chemistry Paper 2 Foundation, Q04.6 (2 marks): A high temperature is used for cracking alkanes. Which two of the following can also be used to crack alkanes? [2 marks] Tick () two boxes. A catalyst A solven
  18. June 2025, Chemistry Paper 2 Foundation, Q04.7 (1 mark): Which chemical is used to test for alkenes? [1 mark] Tick () one box. Ammonia Bromine water Copper sulfate Nitrogen
  19. June 2025, Chemistry Paper 2 Foundation, Q05.1 (1 mark): The general formula for alkanes is CnH2n+2 A molecule of dodecane has 12 carbon atoms. Complete the formula of dodecane. [1 mark] C H A student investigated the
  20. June 2025, Chemistry Paper 2 Foundation, Q05.2 (1 mark): The student used a water bath to heat the dodecane. Suggest one reason why the student used a water bath instead of a Bunsen burner to heat the dodecane. [1 mar
  21. June 2025, Chemistry Paper 2 Foundation, Q05.3 (1 mark): Give one control variable used in the investigation. [1 mark] Figure 5 shows the results. Figure 5
  22. June 2025, Chemistry Paper 2 Foundation, Q05.4 (2 marks): Predict the time taken to collect 40 cm3 of dodecane at 75 °C. You should extend the line of best fit on Figure 5. [2 marks] Time taken = s
  23. June 2025, Chemistry Paper 2 Foundation, Q05.5 (2 marks): The higher the viscosity, the slower dodecane flows. Explain how the trend in Figure 5 shows the effect of an increase in temperature on the viscosity of dodeca
  24. June 2024, Chemistry Paper 2 Higher, Q01.1 (1 mark): Define the term ‘hydrocarbon’. [1 mark]
  25. June 2024, Chemistry Paper 2 Higher, Q01.2 (1 mark): The general formula for alkanes is CnH2n+2 Determine the formula of the alkane with 10 carbon atoms. [1 mark] Formula =
  26. June 2024, Chemistry Paper 2 Higher, Q01.3 (4 marks): Crude oil is a mixture of hydrocarbons. Figure 1 represents industrial equipment used to separate crude oil into fractions. Figure 1 Explain how crude oil is se
  27. June 2024, Chemistry Paper 2 Higher, Q01.4 (1 mark): The alkane molecule C14H30 can be cracked to produce smaller molecules. Balance the equation for the reaction. [1 mark] C14H30 → C8H18 + C3H6 Propene (C3H6) is
  28. June 2024, Chemistry Paper 2 Higher, Q01.5 (2 marks): Describe the test for alkenes. Give the result. [2 marks] Test Result
  29. June 2024, Chemistry Paper 2 Higher, Q01.6 (1 mark): Poly(propene) is made from propene. Figure 2 represents the repeating unit of poly(propene). Figure 2 What type of substance is poly(propene)? [1 mark]
  30. June 2024, Chemistry Paper 2 Higher, Q03.1 (4 marks): Describe how crude oil was formed. [4 marks]
  31. June 2024, Chemistry Paper 2 Foundation, Q06.1 (1 mark): Define the term ‘hydrocarbon’. [1 mark]
  32. June 2024, Chemistry Paper 2 Foundation, Q06.2 (1 mark): The general formula for alkanes is CnH2n+2 Determine the formula of the alkane with 10 carbon atoms. [1 mark] Formula =
  33. June 2024, Chemistry Paper 2 Foundation, Q06.3 (4 marks): Crude oil is a mixture of hydrocarbons. Figure 4 represents industrial equipment used to separate crude oil into fractions. Figure 4 Explain how crude oil is se
  34. June 2024, Chemistry Paper 2 Foundation, Q06.4 (1 mark): The alkane molecule C14H30 can be cracked to produce smaller molecules. Balance the equation for the reaction. [1 mark] C14H30 → C8H18 + C3H6 Propene (C3H6) is
  35. June 2024, Chemistry Paper 2 Foundation, Q06.5 (2 marks): Describe the test for alkenes. Give the result. [2 marks] Test Result
  36. June 2024, Chemistry Paper 2 Foundation, Q06.6 (1 mark): Poly(propene) is made from propene. Figure 5 represents the repeating unit of poly(propene). Figure 5 What type of substance is poly(propene)? [1 mark]
  37. June 2023, Chemistry Paper 2 Higher, Q01.1 (1 mark): Methane is a fuel. Balance the equation for the combustion of methane. [1 mark] CH4 + O2 → CO2 + H2O
  38. June 2023, Chemistry Paper 2 Higher, Q01.2 (2 marks): Many fuels are mixtures. Petrol and diesel are mixtures of hydrocarbons. Table 1 shows properties of petrol and of diesel. Table 1 Petrol Diesel Range of number
  39. June 2023, Chemistry Paper 2 Higher, Q03.1 (2 marks): Give two reasons why crude oil is not a formulation. [2 marks] 1 2
  40. June 2023, Chemistry Paper 2 Higher, Q03.2 (4 marks): Describe how crude oil is separated into fractions. [4 marks]
  41. June 2023, Chemistry Paper 2 Higher, Q03.3 (2 marks): The fractions from crude oil contain alkanes. Explain why alkanes are cracked. [2 marks]
  42. June 2023, Chemistry Paper 2 Higher, Q03.5 (1 mark): Alkenes are produced in cracking. The general formula for the homologous series of alkenes is CnH2n Which formula represents an alkene? [1 mark] Tick () one bo
  43. June 2023, Chemistry Paper 2 Foundation, Q01.1 (1 mark): Crude oil is a finite resource. What is a finite resource? [1 mark] Tick () one box. A limited resource A renewable resource A sustainable resource
  44. June 2023, Chemistry Paper 2 Foundation, Q01.2 (1 mark): What is crude oil formed from? [1 mark] Tick () one box. Plankton Volcanoes Water
  45. June 2023, Chemistry Paper 2 Foundation, Q01.3 (1 mark): What type of substance is crude oil? [1 mark] Tick () one box. Compound Element Mixture
  46. June 2023, Chemistry Paper 2 Foundation, Q01.4 (2 marks): The hydrocarbons in crude oil are separated into fractions using fractional distillation. Complete the sentences. Choose answers from the box. [2 marks] condens
  47. June 2023, Chemistry Paper 2 Foundation, Q01.5 (1 mark): Complete the sentence. Choose the answer from the box. [1 mark] alloys fertilisers fuels Some products of cracking are useful as .
  48. June 2023, Chemistry Paper 2 Foundation, Q01.7 (3 marks): 5.20 kg of crude oil contains 1.53 kg of LPG (Liquefied Petroleum Gas). Calculate the percentage (%) of LPG in 5.20 kg of crude oil. Give your answer to 3 signi
  49. June 2023, Chemistry Paper 2 Foundation, Q05.1 (1 mark): Methane is a fuel. Balance the equation for the combustion of methane. [1 mark] CH4 + O2 → CO2 + H2O
  50. June 2023, Chemistry Paper 2 Foundation, Q05.2 (2 marks): Many fuels are mixtures. Petrol and diesel are mixtures of hydrocarbons. Table 4 shows properties of petrol and of diesel. Table 4 Petrol Diesel Range of number
  51. June 2022, Chemistry Paper 2 Higher, Q04.1 (1 mark): Figure 6 shows a model of an alkane. Figure 6 What is the name of the alkane in Figure 6? [1 mark]
  52. June 2022, Chemistry Paper 2 Higher, Q04.2 (1 mark): What is a hydrocarbon? [1 mark] Large hydrocarbon molecules are cracked.
  53. June 2022, Chemistry Paper 2 Higher, Q04.4 (2 marks): Explain why one of the products of cracking is in high demand. [2 marks]
  54. June 2022, Chemistry Paper 2 Foundation, Q05.1 (1 mark): Complete the formula for the hydrocarbon shown in Figure 9. [1 mark] C H
  55. June 2022, Chemistry Paper 2 Foundation, Q05.2 (1 mark): What is the name of the hydrocarbon in Figure 9? [1 mark]
  56. June 2022, Chemistry Paper 2 Foundation, Q05.3 (1 mark): Which homologous series does the hydrocarbon in Figure 9 belong to? [1 mark]
  57. June 2022, Chemistry Paper 2 Foundation, Q05.4 (1 mark): 30 g of another hydrocarbon contains 24 g of carbon. Which calculation gives the percentage of carbon in the hydrocarbon? [1 mark] Tick () one box. 24 × 30 100
  58. June 2022, Chemistry Paper 2 Foundation, Q05.5 (1 mark): Table 3 shows boiling points of some hydrocarbons. Table 3 Formula of hydrocarbon Boiling point in °C C2H6 –89 C4H10 0 C6H14 69 C8H18 125 C10H22 174 Describe ho
  59. June 2022, Chemistry Paper 2 Foundation, Q05.6 (1 mark): Give one condition used to crack hydrocarbons. [1 mark]
  60. June 2022, Chemistry Paper 2 Foundation, Q05.8 (1 mark): Give one reason why hydrocarbons are cracked. [1 mark]
  61. November 2021, Chemistry Paper 2 Higher, Q02.1 (1 mark): Complete the sentence. [1 mark] Crude oil is formed by the decomposition of .
  62. November 2021, Chemistry Paper 2 Higher, Q02.2 (1 mark): Alkanes are hydrocarbons. Give the name of the alkane molecule that has three carbon atoms. [1 mark]
  63. November 2021, Chemistry Paper 2 Higher, Q02.3 (6 marks): Figure 3 shows two alkane molecules. Figure 3 Table 2 shows the melting points and boiling points of methane and hexane. Table 2 Melting point in °C Boiling poi
  64. November 2021, Chemistry Paper 2 Higher, Q02.4 (1 mark): Decane (C10H22) is cracked to produce two products. Complete the equation for the reaction. [1 mark] C10H22 → + C2H4
  65. November 2021, Chemistry Paper 2 Higher, Q02.5 (2 marks): C2H4 is an alkene. What is the test for alkenes? Give the result of the test if an alkene is present. [2 marks] Test Result
  66. November 2021, Chemistry Paper 2 Foundation, Q07.1 (1 mark): Complete the sentence. [1 mark] Crude oil is formed by the decomposition of .
  67. November 2021, Chemistry Paper 2 Foundation, Q07.2 (1 mark): Alkanes are hydrocarbons. Give the name of the alkane molecule that has three carbon atoms. [1 mark]
  68. November 2021, Chemistry Paper 2 Foundation, Q07.3 (6 marks): Figure 7 shows two alkane molecules. Figure 7 Table 4 shows the melting points and boiling points of methane and hexane. Table 4 Melting point in °C Boiling poi
  69. November 2021, Chemistry Paper 2 Foundation, Q07.4 (1 mark): Decane (C10H22) is cracked to produce two products. Complete the equation for the reaction. [1 mark] C10H22 → + C2H4
  70. November 2021, Chemistry Paper 2 Foundation, Q07.5 (2 marks): C2H4 is an alkene. What is the test for alkenes? Give the result of the test if an alkene is present. [2 marks] Test Result
  71. November 2020, Chemistry Paper 2 Higher, Q01.1 (1 mark): Balance the equation for the combustion of propane. [1 mark] C3H8 + O2 → 3 CO2 + 4 H2O
  72. November 2020, Chemistry Paper 2 Higher, Q01.3 (1 mark): Propane can be cracked to produce propene and hydrogen. Complete the symbol equation for the reaction. [1 mark] C3H8 → + H2 propane propene hydrogen
  73. November 2020, Chemistry Paper 2 Higher, Q01.5 (3 marks): Propene is an alkene. Describe the test for alkenes. Give the colour change in the test. [3 marks] Test Colour change to
  74. November 2020, Chemistry Paper 2 Higher, Q05.1 (3 marks): Describe how crude oil is formed. [3 marks]
  75. November 2020, Chemistry Paper 2 Higher, Q05.2 (4 marks): Describe how crude oil is separated into fractions by fractional distillation. [4 marks]
  76. November 2020, Chemistry Paper 2 Higher, Q05.3 (1 mark): What is the general formula for alkanes? [1 mark]
  77. November 2020, Chemistry Paper 2 Higher, Q05.4 (3 marks): Explain the trend in the boiling points of the alkanes. [3 marks]
  78. November 2020, Chemistry Paper 2 Higher, Q05.5 (2 marks): A student investigated one property of the alkanes C5H12, C10H22 and C15H32 This is the method used. 1. Pour 20 cm3 of C5H12 into a separating funnel. 2. Open t
  79. November 2020, Chemistry Paper 2 Foundation, Q01.1 (2 marks): Complete the sentences. Choose answers from the box. [2 marks] air enzymes mud plankton trees Crude oil is the remains of . Millions of years ago biomass was bu
  80. November 2020, Chemistry Paper 2 Foundation, Q01.2 (1 mark): There are three stages, A, B and C, in separating hydrocarbons from crude oil. Stage A Hydrocarbons evaporate Stage B Crude oil is heated Stage C Vapours conden
  81. November 2020, Chemistry Paper 2 Foundation, Q01.3 (1 mark): What is the name of the process used in separating hydrocarbons from crude oil? [1 mark] Tick () one box. Chromatography Filtration Fractional distillation
  82. November 2020, Chemistry Paper 2 Foundation, Q01.4 (1 mark): Alkanes are hydrocarbons. Figure 1 represents an alkane. Figure 1 What is the formula of the alkane in Figure 1? [1 mark] C H
  83. November 2020, Chemistry Paper 2 Foundation, Q01.6 (1 mark): What is the general formula for alkanes? [1 mark] Tick () one box. CnH2n–2 CnH2n CnH2n+2
  84. November 2020, Chemistry Paper 2 Foundation, Q06.1 (1 mark): Balance the equation for the combustion of propane. [1 mark] C3H8 + O2 → 3 CO2 + 4 H2O
  85. November 2020, Chemistry Paper 2 Foundation, Q06.3 (1 mark): Propane can be cracked to produce propene and hydrogen. Complete the symbol equation for the reaction. [1 mark] C3H8 → + H2 propane propene hydrogen
  86. November 2020, Chemistry Paper 2 Foundation, Q06.5 (3 marks): Propene is an alkene. Describe the test for alkenes. Give the colour change in the test. [3 marks] Test Colour change to
  87. June 2019, Chemistry Paper 2 Higher, Q07.1 (4 marks): Hydrocarbon fuels are produced from crude oil. Describe how crude oil is separated into fractions. [4 marks] Butane is a hydrocarbon.
  88. June 2019, Chemistry Paper 2 Higher, Q07.3 (1 mark): One other product of the combustion of butane is carbon monoxide. Balance the equation. [1 mark] C4H10 + O2 → CO + H2O
  89. June 2018, Chemistry Paper 2 Higher, Q01.1 (1 mark): The hydrocarbons in crude oil are separated into fractions by fractional distillation. Figure 1 shows a fractional distillation column. Figure 1 Crude oil vapou
  90. June 2018, Chemistry Paper 2 Higher, Q01.2 (1 mark): Why do the fractions separate? [1 mark] Tick one box. The fractions have different boiling points. The fractions have different flammability. The fractions have
  91. June 2018, Chemistry Paper 2 Higher, Q01.3 (1 mark): Figure 2 represents an alkane molecule. Figure 2 Name the alkane. [1 mark]
  92. June 2018, Chemistry Paper 2 Higher, Q01.4 (1 mark): Methane (CH4) is an alkane. What is the general formula for alkanes? [1 mark] Tick one box. CnHn CnH2n CnH2n–2 CnH2n+2
  93. June 2018, Chemistry Paper 2 Higher, Q01.5 (1 mark): Alkanes burn in oxygen. Balance the equation for methane burning. [1 mark] CH4 + O2 → CO2 + H2O
  94. June 2018, Chemistry Paper 2 Higher, Q01.6 (1 mark): Ethene is an alkene. Which reagent is used to test for alkenes? [1 mark] Tick one box. Anhydrous copper sulfate Bromine water Damp litmus paper Limewater

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