Rate of reaction: AQA GCSE Combined Science questions

Every AQA GCSE Combined Science exam question on 5.6.1 Rate of reaction, 2018–2025, with its mark scheme and examiner’s report.

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3,069 questions

Q04.5
June 2025 · Chemistry Paper 2 Higher
1 mark5.6.1 Rate of reaction 5.6.2 Reversible reactions and dynamic equilibrium
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Q04.7
June 2025 · Chemistry Paper 2 Higher
3 marks5.6.1 Rate of reaction
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Q04.8
June 2025 · Chemistry Paper 2 Higher
2 marks5.6.1 Rate of reaction 5.9.2 Carbon dioxide and methane as greenhouse gases
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Q05.1
June 2025 · Chemistry Paper 2 Higher
1 mark5.6.1 Rate of reaction
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Q05.2
June 2025 · Chemistry Paper 2 Higher
2 marks5.2.2 How bonding and structure are related to the properties of substances 5.6.1 Rate of reaction
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Q05.3
June 2025 · Chemistry Paper 2 Higher
3 marks5.6.1 Rate of reaction
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Q05.4
June 2025 · Chemistry Paper 2 Higher
1 mark5.6.1 Rate of reaction
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Q05.6
June 2025 · Chemistry Paper 2 Higher
4 marks5.6.1 Rate of reaction
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Q02.1
June 2025 · Chemistry Paper 2 Foundation
1 mark5.6.1 Rate of reaction
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Q02.2
June 2025 · Chemistry Paper 2 Foundation
1 mark5.6.1 Rate of reaction
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Q02.3
June 2025 · Chemistry Paper 2 Foundation
1 mark5.6.1 Rate of reaction
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Q02.4
June 2025 · Chemistry Paper 2 Foundation
1 mark5.6.1 Rate of reaction
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Q02.6
June 2025 · Chemistry Paper 2 Foundation
4 marks5.6.1 Rate of reaction
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Q02.7
June 2025 · Chemistry Paper 2 Foundation
3 marks5.6.1 Rate of reaction
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Q02.8
June 2025 · Chemistry Paper 2 Foundation
2 marks5.6.1 Rate of reaction
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Q02.1
June 2024 · Chemistry Paper 2 Higher
6 marks5.6.1 Rate of reaction
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Q02.2
June 2024 · Chemistry Paper 2 Higher
3 marks5.6.1 Rate of reaction
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Q02.3
June 2024 · Chemistry Paper 2 Higher
2 marks5.6.1 Rate of reaction
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Q02.4
June 2024 · Chemistry Paper 2 Higher
1 mark5.6.1 Rate of reaction
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Q05.5
June 2024 · Chemistry Paper 2 Higher
2 marks5.6.1 Rate of reaction 5.6.2 Reversible reactions and dynamic equilibrium
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All 92 questions on Rate of reaction, as a list

June 2025, Chemistry Paper 2 Higher, Q04.5 (1 mark): What is the effect of using a catalyst on the proportion of methanol in the equilibrium mixture? [1 mark] Tick () one box. The proportion of methanol decreases
June 2025, Chemistry Paper 2 Higher, Q04.7 (3 marks): Explain the effect of using a catalyst on the rate of production of methanol. [3 marks]
June 2025, Chemistry Paper 2 Higher, Q04.8 (2 marks): The catalyst allows the reaction to take place at a lower temperature. Explain one advantage of using a lower temperature in the production of methanol. Do not
June 2025, Chemistry Paper 2 Higher, Q05.1 (1 mark): What is the dependent variable in this investigation? [1 mark]
June 2025, Chemistry Paper 2 Higher, Q05.2 (2 marks): The equation for the reaction is: Na2S2O3(aq) + 2 HCl(aq) → 2 NaCl(aq) + S(s) + SO2(g) + H2O(l) The mixture becomes cloudy as the reaction takes place. Explain
June 2025, Chemistry Paper 2 Higher, Q05.3 (3 marks): Explain the effect of changing the concentration of the sodium thiosulfate solution on the rate of reaction. [3 marks]
June 2025, Chemistry Paper 2 Higher, Q05.4 (1 mark): Why is the stopper inserted into the conical flask as quickly as possible in step 3? [1 mark]
June 2025, Chemistry Paper 2 Higher, Q05.6 (4 marks): Figure 5 shows the results for one concentration of hydrochloric acid. Figure 5 Determine the rate of reaction at 75 seconds. [4 marks] Rate = cm3/s
June 2025, Chemistry Paper 2 Foundation, Q02.1 (1 mark): Name a suitable piece of equipment to measure 4.0 g of calcium carbonate. [1 mark]
June 2025, Chemistry Paper 2 Foundation, Q02.2 (1 mark): Figure 3 shows the gas syringe during the investigation. Figure 3 What is the reading on the gas syringe? [1 mark] cm3
June 2025, Chemistry Paper 2 Foundation, Q02.3 (1 mark): What is the independent variable in the investigation? [1 mark] Tick () one box. Concentration of hydrochloric acid Mass of calcium carbonate Temperature of th
June 2025, Chemistry Paper 2 Foundation, Q02.4 (1 mark): Why did the student insert the stopper into the conical flask as quickly as possible in step 3? [1 mark]
June 2025, Chemistry Paper 2 Foundation, Q02.6 (4 marks): The student measured the volume of gas collected every 30 seconds for 3 minutes. The volume of gas was zero at the start. For one concentration of hydrochloric
June 2025, Chemistry Paper 2 Foundation, Q02.7 (3 marks): The student used a different concentration of hydrochloric acid. 18 cm3 of gas was collected in the first 30 seconds. Calculate the mean rate of reaction for th
June 2025, Chemistry Paper 2 Foundation, Q02.8 (2 marks): Increasing the concentration of hydrochloric acid increases the rate of the reaction. What are two reasons why? [2 marks] Tick () two boxes. The particles are
June 2024, Chemistry Paper 2 Higher, Q02.1 (6 marks): A student investigated the effect of changing the particle size of calcium carbonate on the rate of reaction with hydrochloric acid. Figure 3 shows the apparatu
June 2024, Chemistry Paper 2 Higher, Q02.2 (3 marks): The student investigated the effect of increasing the temperature on the rate of a reaction. Explain the effect of increasing the temperature on the rate of a r
June 2024, Chemistry Paper 2 Higher, Q02.3 (2 marks): What is meant by a ‘catalyst’? [2 marks]
June 2024, Chemistry Paper 2 Higher, Q02.4 (1 mark): What are catalysts in biological systems called? [1 mark]
June 2024, Chemistry Paper 2 Higher, Q05.5 (2 marks): A catalyst is used in the reaction. Suggest what effect the catalyst has on the position of the equilibrium. Give one reason for your answer. [2 marks] Effect R
June 2024, Chemistry Paper 2 Higher, Q05.7 (4 marks): Figure 6 shows the results for sulfur trioxide. Figure 6 Determine the rate of reaction at 60 seconds. [4 marks] Rate = mol/s
June 2024, Chemistry Paper 2 Foundation, Q07.1 (6 marks): A student investigated the effect of changing the particle size of calcium carbonate on the rate of reaction with hydrochloric acid. Figure 6 shows the apparatu
June 2024, Chemistry Paper 2 Foundation, Q07.2 (3 marks): The student investigated the effect of increasing the temperature on the rate of a reaction. Explain the effect of increasing the temperature on the rate of a r
June 2024, Chemistry Paper 2 Foundation, Q07.3 (2 marks): What is meant by a ‘catalyst’? [2 marks]
June 2024, Chemistry Paper 2 Foundation, Q07.4 (1 mark): What are catalysts in biological systems called? [1 mark]
June 2023, Chemistry Paper 2 Higher, Q06.2 (2 marks): Using 10 cm3 of hydrogen peroxide solution gives less accurate results than using 20 cm3 of hydrogen peroxide solution of the same concentration. Explain why. [
June 2023, Chemistry Paper 2 Higher, Q06.3 (1 mark): Suggest one possible source of systematic error in the investigation. [1 mark]
June 2023, Chemistry Paper 2 Higher, Q06.4 (3 marks): Complete Figure 3. You should: • plot the data from Table 3 • draw a line of best fit. The first point has been plotted for you. [3 marks]
June 2023, Chemistry Paper 2 Higher, Q06.5 (2 marks): Which catalyst gives the fastest rate of reaction? Give one reason for your answer. Use the completed Figure 3. [2 marks] Catalyst Reason
June 2023, Chemistry Paper 2 Higher, Q06.6 (2 marks): The rate of reaction is not dependent on the volume of hydrogen peroxide solution. Explain why. [2 marks]
June 2023, Chemistry Paper 2 Higher, Q06.7 (5 marks): Figure 4 shows the results from a different investigation. Figure 4 Determine the rate of reaction at 20 seconds. Show your working on Figure 4. Give your answe
June 2023, Chemistry Paper 2 Foundation, Q04.1 (1 mark): Hydrogen peroxide decomposes to produce water and oxygen. Write a word equation for the reaction. [1 mark] → + A student investigated the rate of decomposition
June 2023, Chemistry Paper 2 Foundation, Q04.2 (2 marks): Which two control variables are used in the investigation? [2 marks] Tick () two boxes. Mass of catalyst Shape of flask Time of taking readings Volume of hydro
June 2023, Chemistry Paper 2 Foundation, Q04.3 (3 marks): Complete Figure 8. You should: • plot the data for the manganese dioxide catalyst from Table 3 • draw a line of best fit. The first two points have been plotted
June 2023, Chemistry Paper 2 Foundation, Q04.4 (2 marks): Which is the best catalyst? Give one reason for your answer. Use the completed Figure 8. [2 marks] Tick () one box. Copper oxide Manganese dioxide Zinc oxide R
June 2023, Chemistry Paper 2 Foundation, Q04.5 (1 mark): The student repeated the investigation with manganese dioxide catalyst. The results were all close to the true value. Complete the sentence. Choose the answer f
June 2023, Chemistry Paper 2 Foundation, Q04.6 (1 mark): The student repeated the investigation using manganese dioxide catalyst at a higher temperature. Complete the sentence. Choose the answer from the box. [1 mark]
June 2022, Chemistry Paper 2 Higher, Q03.2 (1 mark): What type of variable is time in this reaction? [1 mark] Tick () one box. Control Dependent Independent
June 2022, Chemistry Paper 2 Higher, Q03.3 (3 marks): Table 1 shows the results. Table 1 Temperature in °C Time in seconds 19 82 32 48 45 43 52 15 63 7 73 3 Complete Figure 4. You should: • plot the data from Table
June 2022, Chemistry Paper 2 Higher, Q03.4 (4 marks): A student investigated the effect of concentration of sodium thiosulfate on the time taken for the reaction at room temperature. Figure 5 shows the results with
June 2022, Chemistry Paper 2 Higher, Q03.5 (2 marks): The student determined the rate of the reaction at regular time intervals during an experiment. Explain why the rate decreased during the reaction. You should g
June 2022, Chemistry Paper 2 Higher, Q06.1 (1 mark): What type of substance is a catalyst in biological systems? [1 mark] Tick () one box. Algae Alkene Enzyme Formulation
June 2022, Chemistry Paper 2 Higher, Q06.2 (2 marks): Explain how a catalyst increases the rate of a reaction. [2 marks] The reversible reaction for the production of ammonia is: N2(g) + 3 H2(g) ⇌ 2 NH3(g)
June 2022, Chemistry Paper 2 Foundation, Q03.6 (1 mark): Figure 5 shows the reaction profile for the reaction with and without a catalyst. Figure 5 Which letter represents the activation energy for the reaction with a
June 2022, Chemistry Paper 2 Foundation, Q03.7 (1 mark): Give one reason why using a catalyst reduces costs. Do not answer in terms of activation energy. [1 mark]
June 2022, Chemistry Paper 2 Foundation, Q04.1 (2 marks): Draw one line from each type of variable to the correct example of the variable in this investigation. [2 marks] Type of variable Example of variable Dependent
June 2022, Chemistry Paper 2 Foundation, Q04.2 (1 mark): The experiment is done at room temperature. Figure 7 What is the temperature shown on the thermometer in Figure 7? [1 mark] Temperature = °C
June 2022, Chemistry Paper 2 Foundation, Q04.3 (3 marks): Plot the data from Table 1 on Figure 8. Draw a line of best fit. [3 marks] Figure 8
June 2022, Chemistry Paper 2 Foundation, Q04.4 (1 mark): Predict the time taken for the cross to no longer be seen at a concentration of 0.7 mol/dm3 Use your graph in Figure 8. [1 mark] Time = s
June 2022, Chemistry Paper 2 Foundation, Q04.5 (1 mark): Complete the sentence. [1 mark] As the concentration of sodium thiosulfate solution increases, the time taken for the cross to no longer be seen .
June 2022, Chemistry Paper 2 Foundation, Q04.6 (2 marks): In one experiment 0.725 g of sulfur is produced in 20 seconds. Calculate the mean rate of the reaction from 0 to 20 seconds. Use the equation: mean rate of reac
June 2022, Chemistry Paper 2 Foundation, Q04.7 (1 mark): What is the unit for the mean rate of reaction calculated in Question 04.6? [1 mark] Tick () one box. g g/s s s/g
June 2022, Chemistry Paper 2 Foundation, Q04.8 (3 marks): The student did the experiment with 0.15 mol/dm3 sodium thiosulfate solution and repeated the experiment three more times. Table 2 shows the results. Table 2 Te
November 2021, Chemistry Paper 2 Higher, Q01.1 (2 marks): Give the independent variable and one control variable in this investigation. [2 marks] Independent variable Control variable Table 1 shows the results from the
November 2021, Chemistry Paper 2 Higher, Q01.2 (3 marks): Complete Figure 2. You should: • plot the data from Table 1 (the point 0,0 has been plotted for you) • draw a line of best fit. [3 marks] Figure 2
November 2021, Chemistry Paper 2 Higher, Q01.3 (1 mark): How does the rate of this reaction change with time? Use Table 1. [1 mark] Tick () one box. The rate decreases. The rate stays the same. The rate increases.
November 2021, Chemistry Paper 2 Higher, Q01.4 (1 mark): The student repeated the experiment using hydrochloric acid with a higher concentration. Which statement is correct? [1 mark] Tick () one box. The activation e
November 2021, Chemistry Paper 2 Higher, Q01.5 (3 marks): Temperature also affects the rate of the reaction. Explain how increasing the temperature affects the rate of the reaction. You should refer to particles and co
November 2021, Chemistry Paper 2 Higher, Q06.2 (2 marks): A catalyst is used in the reaction. Explain how a catalyst increases the rate of a reaction. [2 marks]
November 2021, Chemistry Paper 2 Higher, Q06.4 (2 marks): Suggest how the catalyst affects the equilibrium position. Give one reason for your answer. [2 marks]
November 2021, Chemistry Paper 2 Foundation, Q02.5 (2 marks): Which two of the following are correct statements about catalysts? [2 marks] Tick () two boxes. Catalysts are included in the chemical equation for a reaction.
November 2021, Chemistry Paper 2 Foundation, Q06.1 (2 marks): Give the independent variable and one control variable in this investigation. [2 marks] Independent variable Control variable Table 3 shows the results from the
November 2021, Chemistry Paper 2 Foundation, Q06.2 (3 marks): Complete Figure 6. You should: • plot the data from Table 3 (the point 0,0 has been plotted for you) • draw a line of best fit. [3 marks] Figure 6
November 2021, Chemistry Paper 2 Foundation, Q06.3 (1 mark): How does the rate of this reaction change with time? Use Table 3. [1 mark] Tick () one box. The rate decreases. The rate stays the same. The rate increases.
November 2021, Chemistry Paper 2 Foundation, Q06.4 (1 mark): The student repeated the experiment using hydrochloric acid with a higher concentration. Which statement is correct? [1 mark] Tick () one box. The activation e
November 2021, Chemistry Paper 2 Foundation, Q06.5 (3 marks): Temperature also affects the rate of the reaction. Explain how increasing the temperature affects the rate of the reaction. You should refer to particles and co
November 2020, Chemistry Paper 2 Higher, Q02.1 (6 marks): The students reacted sodium thiosulfate solution with hydrochloric acid. This is the method used. 1. Use a beaker to measure 50 cm3 of heated sodium thiosulfate
November 2020, Chemistry Paper 2 Higher, Q02.2 (3 marks): Calculate the mean rate of reaction between 1 minute and 3 minutes at 40 °C Use Figure 2 and the equation: Mean rate of reaction = change in mass of gas in g ti
November 2020, Chemistry Paper 2 Higher, Q02.3 (2 marks): Draw a curve on Figure 2 for the results you would expect at a temperature of 50 °C instead of 40 °C [2 marks]
November 2020, Chemistry Paper 2 Foundation, Q04.2 (2 marks): Which two variables should the student keep the same to make the investigation a fair test? [2 marks] Tick () two boxes. Concentration of hydrogen peroxide Mas
November 2020, Chemistry Paper 2 Foundation, Q04.3 (1 mark): Figure 6 shows a gas syringe. Figure 6 What is the volume of gas in the syringe? [1 mark] Volume = cm3
November 2020, Chemistry Paper 2 Foundation, Q04.4 (3 marks): Six of the other results have been plotted on Figure 7. Figure 7 Complete the graph in Figure 7. You should: • plot the results from Table 3 • draw a line of be
November 2020, Chemistry Paper 2 Foundation, Q04.5 (1 mark): Suggest how the student could use these graphs to identify the best catalyst. [1 mark]
November 2020, Chemistry Paper 2 Foundation, Q04.6 (1 mark): All the graphs level off at the same volume of gas. Suggest why. [1 mark]
November 2020, Chemistry Paper 2 Foundation, Q04.7 (2 marks): In another investigation, a student increased the temperature of the hydrogen peroxide. Why is the rate of reaction faster when the temperature of the hydrogen
November 2020, Chemistry Paper 2 Foundation, Q07.1 (6 marks): The students reacted sodium thiosulfate solution with hydrochloric acid. This is the method used. 1. Use a beaker to measure 50 cm3 of heated sodium thiosulfate
November 2020, Chemistry Paper 2 Foundation, Q07.2 (3 marks): Calculate the mean rate of reaction between 1 minute and 3 minutes at 40 °C Use Figure 11 and the equation: Mean rate of reaction = change in mass of gas in g t
November 2020, Chemistry Paper 2 Foundation, Q07.3 (2 marks): Draw a curve on Figure 11 for the results you would expect at a temperature of 50 °C instead of 40 °C [2 marks]
June 2019, Chemistry Paper 2 Higher, Q04.3 (1 mark): How do the reaction profiles show that using a catalyst does not affect the overall energy change for the reaction? [1 mark] Tick () one box. Both reaction pro
June 2019, Chemistry Paper 2 Higher, Q05.1 (1 mark): Which is the correct ionic equation for the reaction? [1 mark] Tick () one box. Mg + 2 H+ → Mg2+ + H2 Mg2+ + 2 Cl– → MgCl2 Mg + 2 HCl → MgCl2 + H2 Mg+ + Cl– →
June 2019, Chemistry Paper 2 Higher, Q05.3 (3 marks): Table 2 shows the student’s results. Table 2 Time in seconds 0 10 35 50 95 120 140 Volume of gas in cm3 0.0 12.5 36.0 43.5 59.0 60.0 60.0 Plot the data from Tab
June 2019, Chemistry Paper 2 Higher, Q05.4 (3 marks): Describe the changes in the rate of this reaction. [3 marks]
June 2019, Chemistry Paper 2 Higher, Q05.5 (3 marks): Explain why the rate of this reaction changes. Give your answer in terms of collision theory. [3 marks]
June 2018, Chemistry Paper 2 Higher, Q05.1 (2 marks): Complete the equation for the reaction. [2 marks] CaCO3 + HCl →
June 2018, Chemistry Paper 2 Higher, Q05.2 (3 marks): Describe the trend shown in Figure 5 Use values in your answer. [3 marks]
June 2018, Chemistry Paper 2 Higher, Q05.3 (2 marks): Describe how you would use Figure 5 to find the rate of the reaction at 15 seconds. You do not need to do a calculation. [2 marks]
June 2018, Chemistry Paper 2 Higher, Q05.4 (1 mark): Give the units for the rate of this reaction. [1 mark] Table 3 shows the results of the investigation. Table 3 Relative size of marble chips Volume of gas produ
June 2018, Chemistry Paper 2 Higher, Q05.5 (1 mark): Give one conclusion about how the size of the marble chips affects the rate of the reaction. [1 mark]
June 2018, Chemistry Paper 2 Higher, Q05.6 (1 mark): Suggest why all three sizes of marble chips produce a maximum volume of 60 cm3 of gas. [1 mark]
June 2018, Chemistry Paper 2 Higher, Q05.7 (2 marks): Figure 6 shows eight small cubes, each 1 cm x 1 cm x 1 cm, and one large cube, 2 cm x 2 cm x 2 cm Figure 6 Total volume of small cubes = 8 cm3 Volume of large c
June 2018, Chemistry Paper 2 Higher, Q05.8 (2 marks): Explain why the size of the marble chips affects the rate of the reaction. Give your answer in terms of ‘collision theory’. [2 marks]
June 2018, Chemistry Paper 2 Higher, Q05.9 (3 marks): The student repeated the investigation with small marble chips using hydrochloric acid with a lower concentration. Figure 7 shows the volume of gas produced dur

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