plumiExothermic and endothermic reactions: AQA GCSE Chemistry questions
Every AQA GCSE Chemistry exam question on 4.5.1 Exothermic and endothermic reactions, 2018–2025, with its mark scheme and examiner’s report.
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Calculations
Q07.4
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Q02.3
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.3: Draw one line from the type of variable to the name of the variable in the investigation. [2 marks] Type of variable Name of variable Dependent variable Indepen](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-3-qp.webp)
Q02.4
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.4: Which container would be the most suitable to reduce energy transfer with the surroundings? [1 mark] Tick () one box. A copper can A glass beaker A polystyrene](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-4-qp.webp)
Q02.5
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.5: Figure 1 shows part of the scale of the thermometer used in the investigation. Figure 1 What is the resolution of the thermometer? [1 mark] Tick () one box. 1](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-5-qp.webp)
Q02.6
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.6: The reaction between a metal and an acid is exothermic. What happens to the temperature of the mixture during the reaction? [1 mark] Tick () one box. Decreases](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-6-qp.webp)
Q02.7
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.7: Which letter in Figure 2 represents the reactants? [1 mark] Tick () one box. A B C D E](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-7-qp.webp)
Q02.8
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.8: Which letter in Figure 2 represents the activation energy? [1 mark] Tick () one box. A B C D E](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-8-qp.webp)
Q02.9
The whole paper ↗![June 2025 Paper 1 Foundation, question 02.9: Which letter in Figure 2 represents the overall energy change? [1 mark] Tick () one box. A B C D E](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun25-02-9-qp.webp)
Q03.3
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Q04.1
The whole paper ↗![June 2024 Paper 1 Higher, question 04.1: Draw two lines of best fit on Figure 3. The lines should cross. [2 marks]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621h-jun24-04-1-qp.webp)
Q04.2
The whole paper ↗![June 2024 Paper 1 Higher, question 04.2: Explain the results shown in Figure 3. Do not refer to anomalous points. Use data from Figure 3. [4 marks]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621h-jun24-04-2-qp.webp)
Q04.3
The whole paper ↗![June 2024 Paper 1 Higher, question 04.3: Explain why using a polystyrene cup gives more accurate results than using a glass beaker. [2 marks]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621h-jun24-04-3-qp.webp)
Q04.6
The whole paper ↗![June 2024 Paper 1 Higher, question 04.6: The results show random errors. The student did not make any measuring errors. Suggest one reason for the random errors in this experiment. [1 mark]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621h-jun24-04-6-qp.webp)
Q08.2
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Q08.3
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Q03.3
The whole paper ↗![June 2024 Paper 1 Foundation, question 03.3: Control variables are used to make an investigation a fair test. Which is a control variable in the investigation? [1 mark] Tick () one box. Highest temperatur](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun24-03-3-qp.webp)
Q03.4
The whole paper ↗![June 2024 Paper 1 Foundation, question 03.4: What is the minimum mass of zinc powder needed to react with all the copper sulfate solution? Use Figure 6. [1 mark] Minimum mass of zinc powder = g](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun24-03-4-qp.webp)
Q03.5
The whole paper ↗![June 2024 Paper 1 Foundation, question 03.5: What is the maximum temperature change in the reaction between zinc powder and 25 cm3 of copper sulfate solution? Use Figure 6. [2 marks] Maximum temperature ch](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun24-03-5-qp.webp)
Q03.7
The whole paper ↗![June 2024 Paper 1 Foundation, question 03.7: Draw two straight lines of best fit on Figure 7. The lines should cross. [2 marks]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun24-03-7-qp.webp)
Q03.8
The whole paper ↗![June 2024 Paper 1 Foundation, question 03.8: Which statement describes the energy change in the reaction shown in Figure 7? [1 mark] Tick () one box. Energy is transferred to the surroundings so the react](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/84621f-jun24-03-8-qp.webp)
All 101 questions on Exothermic and endothermic reactions, as a list
- June 2025, Paper 1 Higher, Q07.4 (4 marks): Figure 8 shows the displayed formula equation for the reaction of hydrazine with oxygen. Figure 8 The reaction is exothermic. The energy released forming new bo
- June 2025, Paper 1 Foundation, Q02.3 (2 marks): Draw one line from the type of variable to the name of the variable in the investigation. [2 marks] Type of variable Name of variable Dependent variable Indepen
- June 2025, Paper 1 Foundation, Q02.4 (1 mark): Which container would be the most suitable to reduce energy transfer with the surroundings? [1 mark] Tick () one box. A copper can A glass beaker A polystyrene
- June 2025, Paper 1 Foundation, Q02.5 (1 mark): Figure 1 shows part of the scale of the thermometer used in the investigation. Figure 1 What is the resolution of the thermometer? [1 mark] Tick () one box. 1
- June 2025, Paper 1 Foundation, Q02.6 (1 mark): The reaction between a metal and an acid is exothermic. What happens to the temperature of the mixture during the reaction? [1 mark] Tick () one box. Decreases
- June 2025, Paper 1 Foundation, Q02.7 (1 mark): Which letter in Figure 2 represents the reactants? [1 mark] Tick () one box. A B C D E
- June 2025, Paper 1 Foundation, Q02.8 (1 mark): Which letter in Figure 2 represents the activation energy? [1 mark] Tick () one box. A B C D E
- June 2025, Paper 1 Foundation, Q02.9 (1 mark): Which letter in Figure 2 represents the overall energy change? [1 mark] Tick () one box. A B C D E
- June 2025, Paper 2 Foundation, Q03.3 (2 marks): When excess water is added to 20 g of calcium oxide, 23 kJ of energy is released. Calculate the energy released when excess water is added to 4 g of calcium oxi
- June 2024, Paper 1 Higher, Q04.1 (2 marks): Draw two lines of best fit on Figure 3. The lines should cross. [2 marks]
- June 2024, Paper 1 Higher, Q04.2 (4 marks): Explain the results shown in Figure 3. Do not refer to anomalous points. Use data from Figure 3. [4 marks]
- June 2024, Paper 1 Higher, Q04.3 (2 marks): Explain why using a polystyrene cup gives more accurate results than using a glass beaker. [2 marks]
- June 2024, Paper 1 Higher, Q04.6 (1 mark): The results show random errors. The student did not make any measuring errors. Suggest one reason for the random errors in this experiment. [1 mark]
- June 2024, Paper 1 Higher, Q08.2 (1 mark): Figure 8 shows four reaction profiles. Figure 8 Which is the correct reaction profile and labels for the reaction between propane and oxygen? Tick () one box.
- June 2024, Paper 1 Higher, Q08.3 (5 marks): Figure 9 shows the displayed formula equation for the reaction between propane and oxygen. Figure 9 The overall energy change of this exothermic reaction is 221
- June 2024, Paper 1 Foundation, Q03.3 (1 mark): Control variables are used to make an investigation a fair test. Which is a control variable in the investigation? [1 mark] Tick () one box. Highest temperatur
- June 2024, Paper 1 Foundation, Q03.4 (1 mark): What is the minimum mass of zinc powder needed to react with all the copper sulfate solution? Use Figure 6. [1 mark] Minimum mass of zinc powder = g
- June 2024, Paper 1 Foundation, Q03.5 (2 marks): What is the maximum temperature change in the reaction between zinc powder and 25 cm3 of copper sulfate solution? Use Figure 6. [2 marks] Maximum temperature ch
- June 2024, Paper 1 Foundation, Q03.7 (2 marks): Draw two straight lines of best fit on Figure 7. The lines should cross. [2 marks]
- June 2024, Paper 1 Foundation, Q03.8 (1 mark): Which statement describes the energy change in the reaction shown in Figure 7? [1 mark] Tick () one box. Energy is transferred to the surroundings so the react
- June 2023, Paper 1 Higher, Q02.1 (2 marks): Give the independent variable and the dependent variable in the investigation. [2 marks] Independent variable Dependent variable Table 2 shows the results. Tabl
- June 2023, Paper 1 Higher, Q02.2 (3 marks): Plot the data from Table 2 on Figure 2. Draw a line of best fit. [3 marks] Figure 2
- June 2023, Paper 1 Higher, Q02.3 (2 marks): Determine the initial temperature of the water. You should extend your line of best fit on Figure 2. [2 marks] Initial temperature of the water = °C
- June 2023, Paper 1 Higher, Q02.4 (1 mark): How do the results show that dissolving ammonium nitrate in water is endothermic? [1 mark] The student repeated the experiment three more times. Table 3 shows t
- June 2023, Paper 1 Higher, Q02.5 (2 marks): The student recorded the mean lowest temperature of the solution for 8.0 g of ammonium nitrate as 16.5 ± 0.3 ºC. Explain why the student included ± 0.3 ºC after
- June 2023, Paper 1 Higher, Q02.6 (1 mark): What type of error is shown by the results in Table 3? [1 mark] Tick () one box. Random error Systematic error Zero error
- June 2023, Paper 1 Higher, Q04.1 (1 mark): Which expression shows how to calculate the overall energy change for the reaction in Figure 3? Use Table 4. [1 mark] Tick () one box. 436 + 346 + 432 kJ/mol 4
- June 2023, Paper 1 Higher, Q04.2 (2 marks): Explain why this reaction releases energy to the surroundings. [2 marks]
- June 2023, Paper 1 Higher, Q04.3 (3 marks): Figure 4 shows part of a reaction profile for the reaction between hydrogen and chlorine. Complete the reaction profile in Figure 4. You should: • label the act
- June 2023, Paper 1 Foundation, Q10.1 (2 marks): Give the independent variable and the dependent variable in the investigation. [2 marks] Independent variable Dependent variable Table 6 shows the results. Tabl
- June 2023, Paper 1 Foundation, Q10.2 (3 marks): Plot the data from Table 6 on Figure 11. Draw a line of best fit. [3 marks] Figure 11
- June 2023, Paper 1 Foundation, Q10.3 (2 marks): Determine the initial temperature of the water. You should extend your line of best fit on Figure 11. [2 marks] Initial temperature of the water = °C
- June 2023, Paper 1 Foundation, Q10.4 (1 mark): How do the results show that dissolving ammonium nitrate in water is endothermic? [1 mark] The student repeated the experiment three more times. Table 7 shows t
- June 2023, Paper 1 Foundation, Q10.5 (2 marks): The student recorded the mean lowest temperature of the solution for 8.0 g of ammonium nitrate as 16.5 ± 0.3 ºC. Explain why the student included ± 0.3 ºC after
- June 2023, Paper 1 Foundation, Q10.6 (1 mark): What type of error is shown by the results in Table 7? [1 mark] Tick () one box. Random error Systematic error Zero error
- June 2022, Paper 1 Higher, Q02.1 (6 marks): Plan a method to investigate the effect of changing the mass of sodium carbonate powder on the highest temperature reached. [6 marks]
- June 2022, Paper 1 Higher, Q02.2 (5 marks): Determine the gradient of the line of best fit in Figure 3. Use the equation: Gradient = Change in highest temperature Change in mass Give the unit. [5 marks] G
- June 2022, Paper 1 Higher, Q02.3 (2 marks): The initial temperature of the reaction mixture is where the line of best fit would meet the y-axis. Determine the initial temperature of the reaction mixture.
- June 2022, Paper 1 Higher, Q02.4 (1 mark): Another student repeated the investigation but added sodium carbonate until the sodium carbonate was in excess. Which sketch graph shows the results obtained wh
- June 2022, Paper 1 Higher, Q02.5 (2 marks): What do labels X and Y represent on Figure 4? [2 marks] X Y
- June 2022, Paper 1 Higher, Q02.6 (1 mark): How does the reaction profile show that the reaction is exothermic? Use Figure 4. [1 mark]
- June 2022, Paper 1 Foundation, Q10.1 (6 marks): Plan a method to investigate the effect of changing the mass of sodium carbonate powder on the highest temperature reached. [6 marks]
- June 2022, Paper 1 Foundation, Q10.2 (5 marks): Determine the gradient of the line of best fit in Figure 17. Use the equation: Gradient = Change in highest temperature Change in mass Give the unit. [5 marks]
- June 2022, Paper 1 Foundation, Q10.3 (2 marks): The initial temperature of the reaction mixture is where the line of best fit would meet the y-axis. Determine the initial temperature of the reaction mixture.
- June 2022, Paper 1 Foundation, Q10.4 (1 mark): Another student repeated the investigation but added sodium carbonate until the sodium carbonate was in excess. Which sketch graph shows the results obtained wh
- June 2022, Paper 1 Foundation, Q10.5 (2 marks): What do labels X and Y represent on Figure 18? [2 marks] X Y
- June 2022, Paper 1 Foundation, Q10.6 (1 mark): How does the reaction profile show that the reaction is exothermic? Use Figure 18. [1 mark]
- November 2021, Paper 1 Higher, Q06.3 (4 marks): A student wants to compare the reactivity of an unknown metal, Q, with that of zinc. Both metals are more reactive than silver. The student is provided with: •
- November 2021, Paper 1 Higher, Q08.3 (3 marks): Figure 6 shows part of the reaction profile for the reaction. The reaction is exothermic. Complete Figure 6. You should: • complete the profile line • label the
- November 2021, Paper 1 Higher, Q08.4 (5 marks): Figure 7 shows the displayed formula equation for the reaction of hydrogen sulfide with oxygen. Figure 7 Table 5 shows some of the bond energies. Table 5 Bond E
- November 2021, Paper 1 Foundation, Q04.1 (2 marks): Calculate the mean temperature increase X for magnesium in Table 4. Do not include the anomalous result in your calculation. [2 marks] X = °C
- November 2021, Paper 1 Foundation, Q04.4 (1 mark): What type of variable is the volume of hydrochloric acid in this investigation? [1 mark] Tick () one box. Control Dependent Independent
- November 2021, Paper 1 Foundation, Q04.5 (1 mark): Suggest one way of improving step 3 in the method to give results which are more repeatable. [1 mark]
- November 2021, Paper 1 Foundation, Q04.6 (3 marks): Figure 6 shows a reaction profile for the reaction of magnesium with hydrochloric acid. Figure 6 What do labels A, B and C represent on Figure 6? Choose answers
- November 2020, Paper 1 Higher, Q02.3 (4 marks): A student is given three metals, X, Y and Z to identify. The metals are magnesium, iron and copper. Plan an investigation to identify the three metals by compar
- November 2020, Paper 1 Higher, Q06.1 (1 mark): The displacement reaction between aluminium and iron oxide has a high activation energy. What is meant by ‘activation energy’? [1 mark]
- November 2020, Paper 1 Higher, Q07.1 (2 marks): A student drew a reaction profile for the reaction between hydrogen and oxygen. Figure 3 shows the student’s reaction profile. Figure 3 The student made two err
- November 2020, Paper 1 Higher, Q09.1 (1 mark): Figure 6 shows an anomalous point when 0.60 g of citric acid was added. This was caused by the student making an error. The student correctly: • measured the ma
- November 2020, Paper 1 Higher, Q09.2 (3 marks): Explain the shape of the graph in terms of the energy transfers taking place. You should use data from Figure 6 in your answer. [3 marks]
- November 2020, Paper 1 Higher, Q09.3 (3 marks): A second student repeated the investigation using a metal container instead of the polystyrene cup. The container and the cup were the same size and shape. Sket
- November 2020, Paper 1 Foundation, Q03.2 (4 marks): Figure 3 shows a reaction profile for the reaction between hydrogen and oxygen. Figure 3 What do the labels W, X, Y and Z represent? Choose answers from the box
- November 2020, Paper 1 Foundation, Q06.4 (1 mark): How do the results in Table 4 show that the reaction is endothermic? [1 mark]
- November 2020, Paper 1 Foundation, Q06.5 (4 marks): Three of the student’s results are plotted on Figure 9. A line of best fit for these points is drawn. Complete Figure 9. You should: • plot the data from Table
- November 2020, Paper 1 Foundation, Q06.6 (2 marks): Determine the overall temperature change for the reaction. Use Figure 9. [2 marks] Overall temperature change = °C
- November 2020, Paper 1 Foundation, Q06.7 (1 mark): What is the dependent variable in this investigation? [1 mark] Tick () one box. Mass of citric acid Temperature of solution Volume of solution
- November 2020, Paper 1 Foundation, Q09.3 (4 marks): A student is given three metals, X, Y and Z to identify. The metals are magnesium, iron and copper. Plan an investigation to identify the three metals by compar
- June 2019, Paper 1 Higher, Q05.5 (3 marks): Calculate the overall energy change for the reaction. Use Figure 7 and Table 3. [3 marks] Overall energy change = kJ
- June 2019, Paper 1 Higher, Q05.6 (2 marks): Explain why the reaction between ammonia and oxygen is exothermic. Use values from your calculation in Question 05.5 [2 marks]
- June 2019, Paper 1 Higher, Q05.7 (2 marks): Figure 8 shows the reaction profile for the reaction between ammonia and oxygen. Complete Figure 8 by labelling the: • activation energy • overall energy change
- June 2019, Paper 1 Higher, Q09.1 (2 marks): Suggest why the student used a polystyrene cup rather than a glass beaker for the reaction. [2 marks]
- June 2019, Paper 1 Higher, Q09.2 (4 marks): Complete Figure 11: • plot the data from Table 6 • draw a line of best fit through these points • extend the lines of best fit until they cross. [4 marks]
- June 2019, Paper 1 Higher, Q09.3 (1 mark): Determine the volume of dilute sulfuric acid needed to react completely with 25.0 cm3 of the potassium hydroxide solution. Use Figure 11. [1 mark] Volume of dil
- June 2019, Paper 1 Higher, Q09.4 (1 mark): Determine the overall temperature change when the reaction is complete. Use Figure 11. [1 mark] Overall temperature change = °C
- June 2019, Paper 1 Foundation, Q02.4 (1 mark): and 02.5 0 2 . 4 Which label shows the activation energy? [1 mark] Tick () one box. A B C D
- June 2019, Paper 1 Foundation, Q02.5 (1 mark): Which label shows the energy of hydrogen peroxide? [1 mark] Tick () one box. A B C D
- June 2019, Paper 1 Foundation, Q02.6 (1 mark): The decomposition of hydrogen peroxide gives out energy to the surroundings. What type of reaction is this? [1 mark] Tick () one box. Displacement Endothermic
- June 2019, Paper 1 Foundation, Q07.1 (1 mark): Ammonium nitrate dissolves in water. The change is endothermic. Which piece of equipment uses this change? [1 mark] Tick () one box. Hand warmer Self-heating c
- June 2019, Paper 1 Foundation, Q07.2 (1 mark): Figure 9 shows part of the scales of four thermometers, A, B, C and D. Figure 9 The student wanted to measure the temperature to a resolution of 0.1 °C Which th
- June 2019, Paper 1 Foundation, Q07.3 (1 mark): Energy is lost to the surroundings during the reaction. What type of error does this cause in the results? [1 mark] Tick () one box. Human error Random error S
- June 2019, Paper 1 Foundation, Q07.4 (1 mark): The student used a glass beaker for the reaction. Name a container the student could use instead of the glass beaker to improve the accuracy of the results. [1
- June 2019, Paper 1 Foundation, Q07.5 (4 marks): Table 3 shows the student’s results. Table 3 Volume of dilute sulfuric acid added in cm3 Temperature in °C 5 21.2 10 22.0 15 22.8 20 23.6 25 24.4 30 25.2 Plot t
- June 2019, Paper 1 Foundation, Q07.6 (1 mark): The intercept on the y-axis of Figure 10 shows the starting temperature of the potassium hydroxide solution. Give the starting temperature of the potassium hydr
- June 2019, Paper 1 Foundation, Q07.7 (2 marks): Another student repeated the investigation and obtained an anomalous result. This result was lower than expected. What could have caused the anomalous result? [
- June 2018, Paper 1 Higher, Q05.1 (2 marks): Plot the data from Table 2 on Figure 4 as a bar chart. [2 marks] Figure 4
- June 2018, Paper 1 Higher, Q05.2 (1 mark): The student concluded that the reactions between the metals and copper sulfate solution are endothermic. Give one reason why this conclusion is not correct. [1
- June 2018, Paper 1 Higher, Q05.3 (4 marks): The temperature change depends on the reactivity of the metal. The student’s results are used to place copper, iron, magnesium and zinc in order of their reacti
- June 2018, Paper 1 Higher, Q05.4 (3 marks): Draw a fully labelled reaction profile for the reaction between zinc and copper sulfate solution on Figure 5. [3 marks] Figure 5
- June 2018, Paper 1 Higher, Q07.4 (4 marks): Bromine reacts with methane in sunlight. Figure 9 shows the displayed formulae for the reaction of bromine with methane. Figure 9 Table 3 shows the bond energie
- June 2018, Paper 1 Foundation, Q06.1 (2 marks): Draw one line from each type of variable to the name of the variable in the investigation. [2 marks] Type of variable Name of variable in the investigation Depe
- June 2018, Paper 1 Foundation, Q06.2 (1 mark): The student used a polystyrene cup and not a glass beaker. Why did this make the investigation more accurate? [1 mark] Tick one box. Glass is breakable Glass is
- June 2018, Paper 1 Foundation, Q06.3 (2 marks): Complete Figure 9. Use data from Table 5. [2 marks] Figure 9
- June 2018, Paper 1 Foundation, Q06.4 (1 mark): The student concluded that the reactions between the metals and copper sulfate solution are endothermic. Give one reason why this conclusion is not correct. [1
- June 2018, Paper 1 Foundation, Q06.5 (1 mark): The temperature increase depends on the reactivity of the metal. Write the metals magnesium, nickel and zinc in order of reactivity. Use Table 5. [1 mark] Most
- June 2018, Paper 1 Foundation, Q06.6 (3 marks): Y is an unknown metal. Describe a method to find the position of Y in the reactivity series in Question 06.5 [3 marks]
- June 2018, Paper 1 Foundation, Q06.7 (1 mark): Which letter represents the products of the reaction? [1 mark] Tick one box. A B C D E
- June 2018, Paper 1 Foundation, Q06.8 (1 mark): Which letter represents the activation energy? [1 mark] Tick one box. A B C D E
- Specimen, Paper 1 Higher, Q09.1 (3 marks): Complete the reaction profile in Figure 6. Draw labelled arrows to show: • The energy given out (∆H) • The activation energy. [3 mark Figure 6 3
- Specimen, Paper 1 Higher, Q09.3 (3 marks): Use the information in Table 6 and Figure 7 to calculate the bond energy for the Br−Br bond. [3 marks] Bond energy kJ/mole 3
- Specimen, Paper 1 Higher, Q09.4 (6 marks): Figure 8 shows the reaction between ethene and chlorine and is similar to the reaction between ethene and bromine. Figure 8 “The more energy levels (shells) of
- Specimen, Paper 1 Foundation, Q05.1 (1 mark): Look at Figure 8. How can you tell that a chemical reaction is taking place?
- Specimen, Paper 1 Foundation, Q05.3 (1 mark): 0 5 Figure 8 shows magnesium burning in air. Figure 8 The reaction is reversible The reaction has a high activation energy The reaction is exothermic Magnesium
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