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Exothermic and endothermic reactions: AQA GCSE Combined Science questions

Every AQA GCSE Combined Science exam question on 5.5.1 Exothermic and endothermic reactions, 2018–2025, with its mark scheme and examiner’s report.

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3,069 questions

  1. Q02.1

    June 2025 · Chemistry Paper 1 Higher

    1 mark5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Higher, question 02.1: What is meant by an ‘exothermic’ reaction? [1 mark]

  2. Q02.3

    June 2025 · Chemistry Paper 1 Higher

    6 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Higher, question 02.3: When solid calcium oxide is added to water, the temperature of the reaction mixture changes. Plan a method to investigate how changing the mass of calcium oxide

  3. Q05.5

    June 2025 · Chemistry Paper 1 Higher

    3 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Higher, question 05.5: Hydrogen chloride is produced in the reaction between methane and chlorine. Figure 6 represents the equation for the reaction. Figure 6 Table 4 shows the bond e

  4. Q05.6

    June 2025 · Chemistry Paper 1 Foundation

    2 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Foundation, question 05.6: Figure 11 shows a reaction profile for the reaction between an acid and an alkali. Figure 11 What do labels A and B represent on Figure 11? Choose the answers f

  5. Q07.1

    June 2025 · Chemistry Paper 1 Foundation

    1 mark5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Foundation, question 07.1: What is meant by an ‘exothermic’ reaction? [1 mark]

  6. Q07.3

    June 2025 · Chemistry Paper 1 Foundation

    6 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2025 Chemistry Paper 1 Foundation, question 07.3: When solid calcium oxide is added to water, the temperature of the reaction mixture changes. Plan a method to investigate how changing the mass of calcium oxide

  7. Q04.7

    June 2024 · Chemistry Paper 1 Higher

    2 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Higher, question 04.7: Give two improvements to the method to produce more accurate results. Do not refer to improvements to the apparatus in your answer. [2 marks] 1 2

  8. Q05.3

    June 2024 · Chemistry Paper 1 Higher

    5 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Higher, question 05.3: Calculate the bond energy X for the H — H bond. Use Figure 7 and Table 3. [5 marks] X = kJ/mol

  9. Q05.4

    June 2024 · Chemistry Paper 1 Higher

    3 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Higher, question 05.4: Energy is released from the reaction to produce ammonia. Figure 8 shows part of the reaction profile for the reaction between nitrogen and hydrogen to produce a

  10. Q03.1

    June 2024 · Chemistry Paper 1 Foundation

    1 mark5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.1: The student varied the mass of zinc. What type of variable is the mass of zinc? [1 mark] Tick () one box. Control Dependent Independent

  11. Q03.2

    June 2024 · Chemistry Paper 1 Foundation

    1 mark5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.2: What is the name of salt A? [1 mark]

  12. Q03.3

    June 2024 · Chemistry Paper 1 Foundation

    2 marks5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.3: The temperature of the solution increases when zinc reacts with copper sulfate solution. Give two other observations that can be made when zinc reacts with copp

  13. Q03.4

    June 2024 · Chemistry Paper 1 Foundation

    2 marks5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.4: Figure 6 shows the highest temperature reached in one experiment. Figure 6 Complete Table 3. Use Figure 6. [2 marks] Table 3 Starting temperature in °C 21 Highe

  14. Q03.5

    June 2024 · Chemistry Paper 1 Foundation

    2 marks5.5.1 Exothermic and endothermic reactions5.4.1 Reactivity of metals
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.5: Calculate value B in Table 4. [2 marks] B = °C

  15. Q03.7

    June 2024 · Chemistry Paper 1 Foundation

    2 marks5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2024 Chemistry Paper 1 Foundation, question 03.7: One of the results for 3.0 g of zinc is anomalous. Which result is anomalous? Suggest one reason why this result is anomalous. [2 marks] Anomalous result Reason

  16. Q02.1

    June 2023 · Chemistry Paper 1 Foundation

    1 mark5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2023 Chemistry Paper 1 Foundation, question 02.1: Which piece of equipment is labelled X? [1 mark] Tick () one box. Beaker Ruler Thermometer

  17. Q02.2

    June 2023 · Chemistry Paper 1 Foundation

    1 mark5.4.1 Reactivity of metals5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2023 Chemistry Paper 1 Foundation, question 02.2: Which piece of equipment is the best to use to measure volumes of solution? [1 mark] Tick () one box. Conical flask Evaporating basin Measuring cylinder

  18. Q02.3

    June 2023 · Chemistry Paper 1 Foundation

    2 marks5.5.1 Exothermic and endothermic reactions5.4.1 Reactivity of metals
    The whole paper ↗
    June 2023 Chemistry Paper 1 Foundation, question 02.3: Calculate value Y in Table 1. [2 marks] Y = °C

  19. Q02.4

    June 2023 · Chemistry Paper 1 Foundation

    2 marks5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2023 Chemistry Paper 1 Foundation, question 02.4: The student then added 1.2 g of magnesium to 50 cm3 of zinc sulfate solution. The temperature increased by 9.0 °C. Calculate the temperature increase when the s

  20. Q02.5

    June 2023 · Chemistry Paper 1 Foundation

    1 mark5.5.1 Exothermic and endothermic reactions
    The whole paper ↗
    June 2023 Chemistry Paper 1 Foundation, question 02.5: What is the name given to a reaction which causes the temperature to increase? [1 mark] Tick () one box. Endothermic Exothermic Thermal decomposition
All 62 questions on Exothermic and endothermic reactions, as a list
  1. June 2025, Chemistry Paper 1 Higher, Q02.1 (1 mark): What is meant by an ‘exothermic’ reaction? [1 mark]
  2. June 2025, Chemistry Paper 1 Higher, Q02.3 (6 marks): When solid calcium oxide is added to water, the temperature of the reaction mixture changes. Plan a method to investigate how changing the mass of calcium oxide
  3. June 2025, Chemistry Paper 1 Higher, Q05.5 (3 marks): Hydrogen chloride is produced in the reaction between methane and chlorine. Figure 6 represents the equation for the reaction. Figure 6 Table 4 shows the bond e
  4. June 2025, Chemistry Paper 1 Foundation, Q05.6 (2 marks): Figure 11 shows a reaction profile for the reaction between an acid and an alkali. Figure 11 What do labels A and B represent on Figure 11? Choose the answers f
  5. June 2025, Chemistry Paper 1 Foundation, Q07.1 (1 mark): What is meant by an ‘exothermic’ reaction? [1 mark]
  6. June 2025, Chemistry Paper 1 Foundation, Q07.3 (6 marks): When solid calcium oxide is added to water, the temperature of the reaction mixture changes. Plan a method to investigate how changing the mass of calcium oxide
  7. June 2024, Chemistry Paper 1 Higher, Q04.7 (2 marks): Give two improvements to the method to produce more accurate results. Do not refer to improvements to the apparatus in your answer. [2 marks] 1 2
  8. June 2024, Chemistry Paper 1 Higher, Q05.3 (5 marks): Calculate the bond energy X for the H — H bond. Use Figure 7 and Table 3. [5 marks] X = kJ/mol
  9. June 2024, Chemistry Paper 1 Higher, Q05.4 (3 marks): Energy is released from the reaction to produce ammonia. Figure 8 shows part of the reaction profile for the reaction between nitrogen and hydrogen to produce a
  10. June 2024, Chemistry Paper 1 Foundation, Q03.1 (1 mark): The student varied the mass of zinc. What type of variable is the mass of zinc? [1 mark] Tick () one box. Control Dependent Independent
  11. June 2024, Chemistry Paper 1 Foundation, Q03.2 (1 mark): What is the name of salt A? [1 mark]
  12. June 2024, Chemistry Paper 1 Foundation, Q03.3 (2 marks): The temperature of the solution increases when zinc reacts with copper sulfate solution. Give two other observations that can be made when zinc reacts with copp
  13. June 2024, Chemistry Paper 1 Foundation, Q03.4 (2 marks): Figure 6 shows the highest temperature reached in one experiment. Figure 6 Complete Table 3. Use Figure 6. [2 marks] Table 3 Starting temperature in °C 21 Highe
  14. June 2024, Chemistry Paper 1 Foundation, Q03.5 (2 marks): Calculate value B in Table 4. [2 marks] B = °C
  15. June 2024, Chemistry Paper 1 Foundation, Q03.7 (2 marks): One of the results for 3.0 g of zinc is anomalous. Which result is anomalous? Suggest one reason why this result is anomalous. [2 marks] Anomalous result Reason
  16. June 2023, Chemistry Paper 1 Foundation, Q02.1 (1 mark): Which piece of equipment is labelled X? [1 mark] Tick () one box. Beaker Ruler Thermometer
  17. June 2023, Chemistry Paper 1 Foundation, Q02.2 (1 mark): Which piece of equipment is the best to use to measure volumes of solution? [1 mark] Tick () one box. Conical flask Evaporating basin Measuring cylinder
  18. June 2023, Chemistry Paper 1 Foundation, Q02.3 (2 marks): Calculate value Y in Table 1. [2 marks] Y = °C
  19. June 2023, Chemistry Paper 1 Foundation, Q02.4 (2 marks): The student then added 1.2 g of magnesium to 50 cm3 of zinc sulfate solution. The temperature increased by 9.0 °C. Calculate the temperature increase when the s
  20. June 2023, Chemistry Paper 1 Foundation, Q02.5 (1 mark): What is the name given to a reaction which causes the temperature to increase? [1 mark] Tick () one box. Endothermic Exothermic Thermal decomposition
  21. June 2023, Chemistry Paper 1 Foundation, Q02.6 (1 mark): The student repeated the experiment with 1.2 g of copper and 50 cm3 of zinc sulfate solution. The temperature did not increase. Give one reason why. [1 mark]
  22. June 2022, Chemistry Paper 1 Higher, Q03 (6 marks): Plan an investigation to find the order of reactivity of three metals. You should use the temperature change when each metal reacts with hydrochloric acid. [6 m
  23. June 2022, Chemistry Paper 1 Higher, Q06.5 (4 marks): Ethene and hydrogen chloride react to produce chloroethane. The displayed formulae equation for the reaction is: The reaction is exothermic. In the reaction the
  24. June 2022, Chemistry Paper 1 Foundation, Q02.4 (1 mark): Figure 5 shows part of the thermometer used to measure the temperature. Figure 5 What is the temperature reading on the thermometer? [1 mark] Temperature = °C
  25. June 2022, Chemistry Paper 1 Foundation, Q02.5 (1 mark): In the reaction, the temperature increases. What type of reaction is happening when the temperature increases? [1 mark]
  26. June 2022, Chemistry Paper 1 Foundation, Q02.6 (2 marks): Sodium hydroxide is an alkali. Which two ions are in sodium hydroxide solution? [2 marks] Tick () two boxes. Cl– H+ Na+ O2– OH–
  27. June 2022, Chemistry Paper 1 Foundation, Q04.2 (1 mark): Suggest one safety precaution that should be taken when heating magnesium and oxygen. [1 mark]
  28. June 2022, Chemistry Paper 1 Foundation, Q07 (6 marks): Plan an investigation to find the order of reactivity of three metals. You should use the temperature change when each metal reacts with hydrochloric acid. [6 m
  29. November 2021, Chemistry Paper 1 Higher, Q03.1 (1 mark): What is the dependent variable in this investigation? [1 mark]
  30. November 2021, Chemistry Paper 1 Higher, Q03.2 (3 marks): Give three improvements to the investigation to make the results more accurate. [3 marks] 1 2 3
  31. November 2021, Chemistry Paper 1 Higher, Q03.3 (4 marks): Figure 4 shows the results. Figure 4 Explain the results. [4 marks]
  32. November 2021, Chemistry Paper 1 Higher, Q03.4 (4 marks): Draw a reaction profile for an exothermic reaction. You should label: • the energy level of the reactants and of the products • the activation energy • the over
  33. November 2021, Chemistry Paper 1 Higher, Q07.1 (2 marks): Suggest why a mixture of methane and oxygen does not react at room temperature. Answer in terms of particles. [2 marks]
  34. November 2021, Chemistry Paper 1 Higher, Q07.2 (1 mark): Table 3 shows the energy released when methane, ethane and propane react with oxygen to produce carbon dioxide and water. Table 3 Compound reacted with oxygen M
  35. November 2021, Chemistry Paper 1 Higher, Q07.3 (5 marks): Propane reacts with oxygen to produce carbon dioxide and water. The displayed formula equation for the reaction is: The reaction is exothermic. In the reaction,
  36. November 2021, Chemistry Paper 1 Foundation, Q05.1 (3 marks): Give three improvements to the investigation to make the results more accurate. [3 marks] 1 2 3
  37. November 2021, Chemistry Paper 1 Foundation, Q05.3 (1 mark): When zinc was added to copper sulfate solution the temperature increased. Figure 9 shows the reaction profile. Figure 9 What type of reaction is shown in Figure
  38. November 2020, Chemistry Paper 1 Higher, Q05.1 (1 mark): What is the dependent variable in this investigation? [1 mark]
  39. November 2020, Chemistry Paper 1 Higher, Q05.2 (1 mark): Suggest why the copper sulfate solution was left for four minutes before adding the magnesium. [1 mark]
  40. November 2020, Chemistry Paper 1 Higher, Q05.3 (2 marks): Complete Figure 4 by: • drawing a line of best fit through all the points after 7 minutes • extending the line back to 4 minutes. [2 marks]
  41. November 2020, Chemistry Paper 1 Higher, Q05.4 (2 marks): The temperature change for the reaction is the temperature difference between the two graph lines at 4 minutes. Determine the temperature change for the reactio
  42. November 2020, Chemistry Paper 1 Higher, Q05.5 (2 marks): Explain why the temperature of the mixture decreases after 7 minutes. [2 marks]
  43. November 2020, Chemistry Paper 1 Higher, Q05.6 (2 marks): The student repeated the experiment with an unknown metal Q instead of magnesium. All the other variables were kept the same. The student recorded a smaller tem
  44. November 2020, Chemistry Paper 1 Foundation, Q02.1 (2 marks): The highest temperature reached when metal X was added to copper sulfate solution was 35.5 °C Determine the temperature change when metal X is added to copper s
  45. November 2020, Chemistry Paper 1 Foundation, Q02.2 (2 marks): Give two variables the student should keep the same in this investigation. [2 marks] 1 2
  46. November 2020, Chemistry Paper 1 Foundation, Q02.3 (2 marks): The student repeated the experiment with metal Y. Table 1 shows four results for metal Y. Table 1 Test 1 Test 2 Test 3 Test 4 Temperature change in °C 9.2 7.3 9
  47. November 2020, Chemistry Paper 1 Foundation, Q02.4 (1 mark): The student repeated the experiment. The student added: • magnesium to copper sulfate solution • an unknown metal A to copper sulfate solution. Table 2 shows th
  48. November 2020, Chemistry Paper 1 Foundation, Q02.5 (1 mark): The student did the experiment with silver and copper sulfate solution. What happens to the temperature of the mixture? Use Figure 3. [1 mark] Tick () one box.
  49. June 2019, Chemistry Paper 1 Higher, Q02.6 (6 marks): Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water. You do not need to write about sa
  50. June 2019, Chemistry Paper 1 Higher, Q03.1 (1 mark): Hydrogen reacts with oxygen. 2 H2 (g) + O2 (g) → 2 H2O (g) Figure 2 shows the relative energies of the reactants and products at a certain temperature. Figure 2
  51. June 2019, Chemistry Paper 1 Higher, Q03.2 (2 marks): Determine the overall energy change for the reaction between hydrogen and oxygen shown in Question 03.1 Use Figure 2. [2 marks] Energy change = kJ
  52. June 2019, Chemistry Paper 1 Higher, Q03.4 (3 marks): The equation shows the decomposition of hydrogen peroxide. 2 H –O –O –H → 2 H – O –H + O=O Table 1 shows the bond energies. Table 1 Bond O–O O=O O–H Bond dissoc
  53. June 2019, Chemistry Paper 1 Foundation, Q01.1 (1 mark): Which of these items uses an endothermic reaction? [1 mark] Tick () one box. Hand warmer Sports injury pack Self-heating can Figure 1 shows the reaction profil
  54. June 2019, Chemistry Paper 1 Foundation, Q01.2 (1 mark): Which letter represents the activation energy for the reaction? [1 mark] Tick () one box. A B C D
  55. June 2019, Chemistry Paper 1 Foundation, Q01.3 (1 mark): Which letter represents the overall energy change for the reaction? [1 mark] Tick () one box. A B C D
  56. June 2019, Chemistry Paper 1 Foundation, Q01.4 (1 mark): Complete the sentence. Choose the answer from the box. [1 mark] lower than the same as higher than In an exothermic reaction the energy of the products is the e
  57. June 2019, Chemistry Paper 1 Foundation, Q01.5 (1 mark): A student measured the temperature at the start and at the end of a reaction. Name the apparatus used to measure the temperature. [1 mark]
  58. June 2019, Chemistry Paper 1 Foundation, Q01.6 (2 marks): Figure 2 shows the temperature at the end of the reaction. Figure 2 Complete Table 1. Use Figure 2. [2 marks] Table 1 Temperature at start in °C 14.3 Temperatur
  59. June 2019, Chemistry Paper 1 Foundation, Q07.6 (6 marks): Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water. You do not need to write about sa
  60. June 2018, Chemistry Paper 1 Higher, Q02.3 (2 marks): The reaction between sodium and chlorine is an exothermic reaction. Complete the reaction profile for the reaction between sodium and chlorine. [2 marks] Figure
  61. June 2018, Chemistry Paper 1 Foundation, Q04.4 (1 mark): The metal carbonate takes in energy from the surroundings to break down. What type of reaction takes in energy from the surroundings? [1 mark] Tick one box. com
  62. June 2018, Chemistry Paper 1 Foundation, Q06.3 (2 marks): The reaction between sodium and chlorine is an exothermic reaction. Complete the reaction profile for the reaction between sodium and chlorine. [2 marks] Figure

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