plumiEnergy changes in reactions: Edexcel GCSE Chemistry questions
Every Edexcel GCSE Chemistry exam question on Energy changes in reactions (specification points 7.9–7.16), 2018–2025, with its mark scheme and examiner’s report.
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Q6(c)
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Q8(e)
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Q3(a)
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Q3(b)(i)
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Q3(b)(ii)
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Q3(b)(iii)
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Q3(b)(iv)
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Q7(b)(ii)
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Q7(c)
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Q7(d)
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Q4(a)
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Q4(b)(i)
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Q4(b)(ii)
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Q4(b)(iii)
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Q4(b)(iv)
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Q8(b)(i)
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Q8(b)(ii)
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Q8(b)(iii)
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Q2(a)
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Q2(b)(i)
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All 61 questions on Energy changes in reactions, as a list
- June 2025, Paper 2 Higher, Q6(c) (3 marks): Under extreme conditions, xenon reacts with fluorine to form xenon hexafluoride. The reaction is exothermic. The energy change for the reaction is –400 kJ mol–1
- June 2025, Paper 2 Higher, Q8(e) (4 marks): Hydrogen iodide reacts with oxygen to form water and iodine. The equation for this reaction is 4HI + O2 → 2H2O + 2I2 Calculate the energy change for this reacti
- June 2025, Paper 2 Foundation, Q3(a) (1 mark): Name the piece of apparatus labelled X in Figure 2. (1)
- June 2025, Paper 2 Foundation, Q3(b)(i) (1 mark): State why the mixture is stirred in step 3. (1)
- June 2025, Paper 2 Foundation, Q3(b)(ii) (2 marks): State two ways the apparatus could be changed to reduce the heat energy lost during the investigation. (2) 1 2
- June 2025, Paper 2 Foundation, Q3(b)(iii) (2 marks): The student carries out the experiment three times. Figure 3 shows the results. initial temperature temperature of mixture temperature of water in °C after stir
- June 2025, Paper 2 Foundation, Q3(b)(iv) (2 marks): Explain, using the information in Figure 3, the type of reaction that occurs when magnesium chloride dissolves in water. (2)
- June 2024, Paper 2 Higher, Q7(b)(ii) (2 marks): The reaction of potassium with water is exothermic. On Figure 9, draw and label the reaction profile diagram for this reaction, labelling the activation energy.
- June 2024, Paper 2 Higher, Q7(c) (3 marks): Some reactions are endothermic. Explain, in terms of bond breaking and bond forming, why some reactions are endothermic. (3)
- June 2024, Paper 2 Higher, Q7(d) (4 marks): Ethene reacts with hydrogen chloride. Cl H H H Cl → H C C + H C C H H H H H Figure 10 shows the bond energies for the different bonds in the three molecules in
- June 2024, Paper 2 Foundation, Q4(a) (1 mark): In one reaction the temperature of the reaction mixture decreases. Which word describes this type of reaction? (1) A displacement B endothermic C exothermic D n
- June 2024, Paper 2 Foundation, Q4(b)(i) (1 mark): State what is used to measure the temperature change in Figure 7. (1)
- June 2024, Paper 2 Foundation, Q4(b)(ii) (1 mark): State one reason for using the piece of equipment A in Figure 7. (1)
- June 2024, Paper 2 Foundation, Q4(b)(iii) (1 mark): A student suggests putting a lid on piece of equipment B. State why this would help to give a more accurate value for the temperature change. (1)
- June 2024, Paper 2 Foundation, Q4(b)(iv) (4 marks): Four different salts, P, Q, R and S, are dissolved in water. Figure 8 shows the starting temperature of the water and the final temperature of the solution afte
- June 2023, Paper 2 Higher, Q8(b)(i) (1 mark): Which arrow represents the activation energy for the reaction? (1) A arrow P B arrow Q C arrow R D arrow S
- June 2023, Paper 2 Higher, Q8(b)(ii) (2 marks): Describe what the reaction profile shows about the energy involved in bond breaking and bond making in this reaction. (2)
- June 2023, Paper 2 Higher, Q8(b)(iii) (4 marks): Figure 14 shows the energies of some bonds. bond bond energy in kJ mol–1 N N 944 H H 436 H N 388 Figure 14 The equation for the reaction between nitrogen and hy
- June 2023, Paper 2 Foundation, Q2(a) (1 mark): For steps 2 and 3, the student obtained the mass measurements shown in Figure 4 for the first salt. mass of empty boiling tube in g 22.52 mass of boiling tube +
- June 2023, Paper 2 Foundation, Q2(b)(i) (2 marks): Calculate the temperature change for salt C. Include a sign to show if the temperature change is an increase or a decrease. (2) temperature change = °C
- June 2023, Paper 2 Foundation, Q2(b)(ii) (2 marks): Explain which salt produces the biggest exothermic change. (2)
- June 2023, Paper 2 Foundation, Q2(c) (2 marks): Explain why a polystyrene cup is a better container to use for this investigation than a glass beaker. (2)
- June 2022, Paper 2 Higher, Q9(a)(i) (1 mark): Which row is correct about the energy changes for these processes? (1) energy change breaking a bond making a bond A energy is released energy is released B ene
- June 2022, Paper 2 Higher, Q9(a)(ii) (4 marks): Hydrogen reacts with fluorine. H2 + F2 → 2HF Figure 12 shows the bond energies for the bonds in the three molecules in the equation. bond bond energy in kJ mol–
- June 2022, Paper 2 Higher, Q9(b) (6 marks): The reaction profile for an uncatalysed exothermic reaction is shown in Figure 13. energy reactants products progress of reaction Figure 13 Using some examples
- June 2022, Paper 2 Foundation, Q4(a) (1 mark): What does an exothermic reaction always give out? (1) A heat energy B light C a gas D sound
- June 2022, Paper 2 Foundation, Q4(b)(i) (1 mark): Give the letter of the piece of apparatus, A, B, C or D, in Figure 6 that is used to measure the temperature. (1)
- June 2022, Paper 2 Foundation, Q4(b)(ii) (1 mark): Give the name of the piece of apparatus B shown in Figure 6. (1)
- June 2022, Paper 2 Foundation, Q4(b)(iii) (1 mark): The piece of apparatus labelled C is made from polystyrene. State why polystyrene is a better material than glass for this piece of apparatus. (1)
- June 2022, Paper 2 Foundation, Q4(b)(iv) (3 marks): The results of the experiment are given in Figure 7. temperature of liquid at start in °C 18.6 temperature of products at end in °C 16.1 Figure 7 Calculate the
- November 2021, Paper 2 Higher, Q2(b)(i) (2 marks): Explain how Figure 2 shows that dissolving ammonium chloride in water is an endothermic process. (2)
- November 2021, Paper 2 Higher, Q2(b)(ii) (2 marks): Complete the reaction profile in Figure 2 and label the activation energy. (2)
- November 2021, Paper 2 Higher, Q9(c) (4 marks): Figure 11 shows the reaction of propene, C3H6, with water. H H H H O H O C=C + H H C C C H H H H C H H H H H Figure 11 Figure 12 shows some bond energies. bond
- November 2021, Paper 2 Foundation, Q8(b)(i) (2 marks): Explain how Figure 17 shows that dissolving ammonium chloride in water is an endothermic process. (2)
- November 2021, Paper 2 Foundation, Q8(b)(ii) (2 marks): Complete the reaction profile in Figure 17 and label the activation energy. (2)
- November 2020, Paper 2 Higher, Q9(b) (4 marks): The energies of some bonds are shown in Figure 8. bond bond energy in kJ mol–1 C H 435 O O 496 C O 805 H O 463 Figure 8 Methane burns in oxygen to form carbon d
- November 2020, Paper 2 Foundation, Q3(b)(i) (1 mark): Name a piece of apparatus that should be used to measure the 100 cm3 of water in step 1. (1)
- November 2020, Paper 2 Foundation, Q3(b)(ii) (1 mark): The student cannot work out the temperature decrease using the method described. State what the student must do before step 2 to be able to work out the tempera
- November 2020, Paper 2 Foundation, Q3(b)(iii) (1 mark): State why a polystyrene cup is used in this experiment. (1)
- November 2020, Paper 2 Foundation, Q3(b)(iv) (2 marks): Figure 6 shows the reaction profile for this reaction. Use the words from the box to complete the labels on Figure 6. activation energy products reactants (2) h
- June 2019, Paper 2 Higher, Q8(b) (3 marks): The reaction between calcium carbonate and dilute hydrochloric acid is exothermic. Explain, in terms of bond breaking and bond making, why some reactions are ex
- June 2019, Paper 2 Foundation, Q4(a) (1 mark): Give the name of the apparatus that could be used to measure 1.00 g of calcium chloride. (1)
- June 2019, Paper 2 Foundation, Q4(b) (2 marks): The student’s results were temperature of water at start = 21 °C temperature of mixture after stirring = 32 °C Explain, using these results, the type of heat en
- June 2019, Paper 2 Foundation, Q4(c)(i) (1 mark): Which hazard symbol would be expected to be seen on a container of calcium chloride? (1) A B C D
- June 2019, Paper 2 Foundation, Q4(c)(ii) (1 mark): Give a safety precaution that the student should take during the experiment. (1)
- June 2019, Paper 2 Foundation, Q4(d) (1 mark): State one way in which the apparatus could be changed to reduce the amount of heat energy lost during the experiment. (1)
- June 2018, Paper 2 Higher, Q6(d)(ii) (3 marks): In a cracking reaction, reactants are heated to form products. This reaction is endothermic. On the axes provided, draw the reaction profile of this reaction. L
- June 2018, Paper 2 Higher, Q10(a) (4 marks): Hydrogen reacts with oxygen to form steam. 2H2(g) + O2(g) o 2H2O(g) Bond energies are shown in Figure 14. bond energy in kJ mol−1 bond H H 435 O O 500 O H 460 F
- June 2018, Paper 2 Foundation, Q1(a) (2 marks): The steps needed to carry out this experiment are P, Q, R, S and T. They are shown below. They are not in the correct order. P pour the 50 cm3 water into the po
- June 2018, Paper 2 Foundation, Q1(b) (1 mark): The dissolving of this solid in water is an exothermic change. The experiment is repeated a number of times. Compared with the initial temperature of the water,
- June 2018, Paper 2 Foundation, Q1(c) (1 mark): State how step R could be changed to measure the volume of water more accurately. (1)
- June 2018, Paper 2 Foundation, Q1(d)(i) (2 marks): Explain why the pack goes cold. (2)
- June 2018, Paper 2 Foundation, Q1(d)(ii) (1 mark): Give the reason why the pack can be used only once. (1)
- Specimen, Paper 2 Higher, Q10(b) (4 marks): When sodium hydroxide solution is neutralised with an acid there is a temperature change. A student is given dilute hydrochloric acid and dilute ethanoic acid o
- Specimen, Paper 2 Higher, Q10(c) (3 marks): Hydrogen reacts with chlorine to form hydrogen chloride. H2(g) + Cl2(g) → 2HCl(g) The reaction is exothermic. Draw and label the reaction profile diagram for th
- Specimen, Paper 2 Higher, Q10(d) (4 marks): The energies of some bonds are shown in Figure 13. energy of bond bond / kJmol–1 H–H 436 Cl–Cl 243 H–Cl 432 Figure 13 Hydrogen reacts with chlorine to form hydr
- Specimen, Paper 2 Foundation, Q4(a) (1 mark): When solid ammonium chloride is shaken with water, a colourless solution forms and the temperature changes from 20°C to 16°C. Give the name of the type of heat
- Specimen, Paper 2 Foundation, Q4(b)(i) (1 mark): State a suitable container for the iron(II) sulfate solution in this experiment. (1)
- Specimen, Paper 2 Foundation, Q4(b)(ii) (1 mark): State what the student should do to the mixtures during the experiment. (1)
- Specimen, Paper 2 Foundation, Q4(b)(iii) (2 marks): Figure 5 shows the results obtained by the student. metal added to temperature rise iron(II) sulfate solution / °C magnesium 6.0 copper 0.0 zinc 2.8 Figure 5 Ex
- Specimen, Paper 2 Foundation, Q4(b)(iv) (2 marks): Explain how the student could improve the method to make a fairer comparison of the temperature change produced by the different metals. (2)
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