plumiCalorimetry and q = mcΔT: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 3.2.1.3 Calorimetry and q = mcΔT, 2016–2025, with mark schemes and examiner’s reports where available.
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All 36 questions on Calorimetry and q = mcΔT, as a list
- June 2025, Paper 3, Q6 (6 marks): 6* The enthalpy change of Reaction 6.1, ∆H1, shown below, is difficult to measure directly by experiment. 2NaHCO3(s) Na2CO3(s) + H2O(l) + CO2(g) ∆H1 Reaction 6.
- June 2025, AS Paper 2, Q1(c)(i) (4 marks): Give your answer to 3 significant figures. Assume that the density of all solutions and the specific heat capacity, c, of the reaction mixture is the same as fo
- June 2025, AS Paper 2, Q1(c)(ii) (2 marks): The student repeats the experiment using the same volume and concentration of NaOH but using 20.0 cm3 of 2.80 mol dm–3 HCl instead of 40.0 cm3 of 1.40 mol dm–3
- June 2024, Paper 1, Q7 (1 mark): The equation for the reaction of sulfuric acid with potassium hydroxide is shown below. H2SO4(aq) + 2KOH(aq) K2SO4(aq) + 2H2O(l) 25 cm3 of 1.00 mol dm–3 H2SO4 i
- June 2024, AS Paper 2, Q3(b) (6 marks): Enthalpy changes of reaction can be determined by experiment. (b)* A student carries out an experiment to determine the enthalpy change for the reaction between
- June 2024, AS Paper 2, Q3(c) (2 marks): The student modifies the experiment using 50 cm3 instead of 100 cm3 of 0.500 mol dm–3 copper(II) nitrate solution. The value of ΔrH for this modified experiment
- June 2023, Paper 1, Q18(a) (3 marks): A student determines the enthalpy change of combustion, ∆cH, of heptane, C7H16, using the method outlined below. • Add 150 g of water to a beaker and measure it
- June 2023, Paper 3, Q2(a)(ii) (3 marks): A student carries out an experiment to determine the enthalpy change of solution of RbCl O3 using the method below. • A 2.00 g sample of solid RbCl O3 is added
- June 2023, AS Paper 2, Q4(b)(i) (1 mark): The thermometer had an uncertainty of ± 0.25 °C in each temperature reading. Calculate the percentage uncertainty in the temperature change. percentage uncertai
- June 2023, AS Paper 2, Q4(b)(ii) (6 marks): This question is about the enthalpy change of combustion of alcohols. (ii)* Use the student’s results to determine ∆cH of butan-1-ol in kJ mol–1. Explain why th
- June 2023, AS Paper 2, Q4(b)(iii) (1 mark): Another student carries out the experiment in 4(b) using 150 g of water in the beaker instead of 200 g. Calculate the mass of butan-1-ol that would produce the
- June 2022, Paper 1, Q17(a)(i) (4 marks): Determine the maximum temperature reached in this reaction. Give your answer to 3 significant figures. Assume that the specific heat capacity and density of the
- June 2022, Paper 1, Q17(a)(ii) (1 mark): The student wants to repeat the experiment, but there is not enough AgNO3(aq) left to use another 100.0 cm3 portion. The student decides to modify the method by
- June 2022, Paper 3, Q5(a) (6 marks): This question is about energy changes. (a)* A student plans to determine the enthalpy change of hydration of calcium ions. The student finds the information bel
- June 2022, AS Paper 1, Q25(a)(i) (4 marks): Calculate ∆rH, in kJ mol–1, for the reaction shown in Equation 25.1. Give your answer to 3 significant figures. Assume that the density and specific heat capaci
- November 2021, Paper 1, Q22(b)(ii) (4 marks): Calculate the enthalpy change, ΔH1, for Equation 22.1, and deduce the value for the enthalpy change of neutralisation, ∆neutH, in kJ mol–1. Assume that the dens
- November 2021, Paper 1, Q22(b)(iii) (2 marks): The student repeats the experiment using 50.0 cm3 of 1.60 mol dm–3 H2SO4 and 110.0 cm3 of 1.50 mol dm–3 NaOH. Predict the increase in temperature. Explain your
- November 2021, AS Paper 2, Q4(a) (6 marks): A student carries out an investigation to find the enthalpy change for the decomposition of magnesium carbonate, ∆H1 (Reaction 1). Reaction 1 MgCO3(s) MgO(s) +
- November 2020, Paper 3, Q3(a)(i) (3 marks): Determine the enthalpy change of combustion of propane, in kJ mol−1. Give your answer to 3 significant figures. ∆cH (C3H8) = kJ mol−1 [3]
- November 2020, Paper 3, Q3(a)(ii) (1 mark): The student finds that the experimental enthalpy change ∆cH (C3H8) is much less exothermic than the accurate standard enthalpy change ∆cH (C3H8) in databases. O
- November 2020, AS Paper 2, Q2(b) (4 marks): A student carries out an experiment to determine the enthalpy change of combustion of cyclohexane, C6H12, using the apparatus shown in the diagram. thermometer
- November 2020, AS Paper 2, Q2(c)(i) (2 marks): The uncertainty in each thermometer reading is ±0.5 °C and the uncertainty in the measured volume of water is ±2 cm3. Determine whether the temperature change o
- November 2020, AS Paper 2, Q2(c)(ii) (2 marks): Suggest two reasons, apart from measurement uncertainties, why the experimental value for ΔcH is less exothermic than the data book value. Reason 1 Reason 2 [2]
- November 2020, AS Paper 2, Q2(c)(iii) (2 marks): In the experiment the water in the beaker was heated for 5 minutes. The student thought that the experiment could be improved by heating the water for 10 minute
- June 2019, Paper 3, Q5(a)(i) (6 marks): The enthalpy change of reaction, ∆rH, for converting anhydrous copper(II) sulfate to hydrated copper(II) sulfate is difficult to measure directly by experiment.
- June 2019, Paper 3, Q5(a)(ii) (1 mark): The thermometer had an uncertainty in each temperature reading of ± 0.1 °C. The student calculates a 20% uncertainty in the temperature change in Experiment 2.
- June 2018, Paper 3, Q5(a) (4 marks): Aqueous succinic acid can be neutralised by aqueous sodium hydroxide, NaOH(aq): (CH2COOH)2(aq) + 2NaOH(aq) → (CH2COONa)2(aq) + 2H2O(l) This reaction can be used
- June 2018, AS Paper 1, Q12 (1 mark): A student carried out an experiment to measure the enthalpy change of combustion of methanol. The energy from the combustion of methanol was used to heat a beak
- June 2018, AS Paper 1, Q23(a)(i) (4 marks): Calculate ∆rH, in kJ mol−1, for the reaction shown in equation 23.1. Give your answer to an appropriate number of significant figures. Assume that the density a
- June 2017, Paper 3, Q2(a) (6 marks): A student plans to determine the enthalpy change of reaction 3.1 shown below. Na2O(s) + 2HCl(aq) 2NaCl(aq) + H2O(l) reaction 3.1 This enthalpy change can be det
- June 2017, Paper 3, Q2(b) (2 marks): The uncertainty in each temperature reading is ±0.1 °C. The uncertainty in each mass reading is ±0.005 g. Determine whether the mass of Na2O or the temperature
- June 2017, Paper 3, Q2(c) (2 marks): Suggest a modification to this experiment, using the same apparatus, which would reduce the percentage errors in the measurements. Explain your reasoning. [2]
- June 2017, AS Paper 1, Q11 (1 mark): 50.0 cm3 of 1.00 mol dm–3 NaOH is neutralised by 50.0 cm3 of 1.00 mol dm–3 HNO3. The temperature increases by 6.0 °C. The experiment is repeated using: 25.0 cm3
- June 2017, AS Paper 2, Q3(a)(i) (4 marks): Calculate the enthalpy change of combustion, ∆cH, of hexane, in kJ mol−1. Give your final answer to an appropriate number of significant figures. ∆cH kJ mol−1 [
- June 2017, AS Paper 2, Q3(a)(ii) (2 marks): The calculated value of ∆cH for hexane from this experiment is different from the data book value. Suggest two reasons for this difference. 1 2 [2]
- June 2016, AS Paper 1, Q24(a) (4 marks): Calculate ΔrH, in kJ mol–1, for the reaction shown in the equation above. Give your answer to an appropriate number of significant figures. Assume that the dens
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