plumiEnthalpy change: AQA A‑Level Chemistry questions
AQA A-Level Chemistry past-paper questions on 3.1.4.1 Enthalpy change, 2008–2025, with mark schemes and examiner’s reports where available.
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Q04.1
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All 53 questions on Enthalpy change, as a list
- June 2025, Paper 1, Q04.1 (1 mark): Give the standard conditions indicated by the symbol o in ΔfH o and S o [1 mark]
- June 2025, AS Paper 2, Q07.1 (1 mark): Define enthalpy change. [1 mark]
- June 2025, AS Paper 2, Q22 (1 mark): Which reaction at 298 K has a standard enthalpy change equal to the standard enthalpy of formation of liquid iodoethane? [1 mark] A 1 2 I2(I) + 2 C(s) + 5 2 H2(
- June 2024, AS Paper 1, Q08.1 (2 marks): Define standard enthalpy of formation. [2 marks]
- June 2023, Paper 3, Q10 (1 mark): Which reaction has a standard enthalpy change equal to the standard enthalpy of formation for barium chloride? [1 mark] A Ba(g) + Cl2(g) → BaCl2(s) B Ba2+(g) +
- June 2023, AS Paper 1, Q15 (1 mark): Which reaction has an enthalpy change equal to the standard enthalpy of formation of potassium oxide? [1 mark] A 4 K(s) + O2(g) → 2 K2O(s) B 2 K(s) + O(g) → K2O
- June 2023, AS Paper 2, Q05.4 (2 marks): The energy stored in fuels can be compared using energy density values measured in kJ dm–3 Calculate the energy density of butan-1-ol. enthalpy of combustion of
- June 2022, AS Paper 2, Q07.3 (2 marks): Table 2 shows the enthalpies of combustion of the three fuels from the fermentation of silverskin. Table 2 Fuel Standard enthalpy of combustion / kJ mol–1 Energ
- November 2021, Paper 1, Q01.1 (1 mark): State the meaning of the term enthalpy change. [1 mark]
- November 2021, AS Paper 1, Q07.1 (2 marks): State the meaning of the term standard enthalpy of combustion. [2 marks]
- November 2021, AS Paper 2, Q08.1 (1 mark): Define the term enthalpy change. [1 mark]
- November 2020, Paper 3, Q05.3 (1 mark): State why the heat change calculated from the bomb calorimeter experiment is not an enthalpy change. [1 mark]
- November 2020, Paper 3, Q09 (1 mark): Which reaction has an enthalpy change equal to the standard enthalpy of formation of silver iodide? [1 mark] A Ag(g) + 1 2 I2(g) → AgI(s) B Ag(s) + 1 2 I2(s) →
- November 2020, AS Paper 1, Q04.1 (1 mark): State the meaning of the term enthalpy change as applied to a chemical reaction. [1 mark]
- November 2020, AS Paper 1, Q12 (1 mark): Which reaction has an enthalpy change equal to the standard enthalpy of formation of lithium fluoride? [1 mark] A Li(g) + 1 2 F2(g) → LiF(s) B Li+(g) + F–(g) →
- November 2020, AS Paper 2, Q01.1 (2 marks): Define the term standard enthalpy of formation. [2 marks]
- June 2019, AS Paper 1, Q14 (1 mark): Which equation represents the reaction that has a standard enthalpy change equal to the standard enthalpy of formation for barium chloride? [1 mark] A Ba(g) + C
- June 2017, AS Paper 1, Q02.1 (1 mark): Write an equation, including state symbols, for the reaction with an enthalpy change equal to the enthalpy of formation for iron(III) oxide. [1 mark
- June 2017, AS Paper 2, Q04.4 (3 marks): Values of the enthalpy change for combustion of 1 g of some alkanes are shown in Table 2. Table 2 methane ethane propane butane pentane Enthalpy change in kJ fo
- June 2017, AS Paper 2, Q04.5 (2 marks): Isooctane (2,2,4-trimethylpentane) is an important component of petrol used in cars. When isooctane is burned, the enthalpy change is −47.8 kJ g−1 Isooctane is
- June 2016, AS Paper 2, Q02.5 (3 marks): The enthalpy of combustion of ethanol is −1371 kJ mol−1. The density of ethanol is 0.789 g cm−3. Calculate the heat energy released in kJ when 0.500 dm3 of etha
- June 2016, CHEM2 (old spec), Q2(a) (3 marks): State the meaning of the term standard enthalpy of combustion. [3 marks]
- June 2015, CHEM5 (old spec), Q2(c)(i) (1 mark): Suggest one reason why you would expect the standard enthalpy of combustion of hydrogen to be the same as the answer to Question 2 (b). [1 mark]
- June 2015, CHEM2 (old spec), Q7(d) (3 marks): Define the term standard enthalpy of combustion. [3 marks]
- June 2014, CHEM2 (old spec), Q3(c)(ii) (1 mark): Suggest why the value for the standard enthalpy of formation of liquid antimony, given in Table 1, is not zero. [1 mark]
- June 2013, CHEM2 (old spec), Q10(b) (2 marks): Write an equation for the reaction that has an enthalpy change that is the standard enthalpy of formation of ethanol. (2 marks)
- June 2013, CHEM2 (old spec), Q10(c)(i) (3 marks): Define the term standard enthalpy of combustion.
- January 2013, CHEM5 (old spec), Q1(c)(i) (1 mark): Write an equation, including state symbols, for the reaction that has an enthalpy change equal to the standard enthalpy of formation of gaseous ClF (1 mark)
- January 2013, CHEM2 (old spec), Q1(b)(ii) (2 marks): Complete Figure 2 by drawing the shape of the reaction profile from reactants to products for an exothermic reaction. Show the position of the products. Show an
- January 2013, CHEM2 (old spec), Q3(a)(ii) (1 mark): State why the value for the standard enthalpy of formation of Mn(s) is zero. (1 mark)
- June 2012, CHEM2 (old spec), Q2(a)(ii) (1 mark): State why the standard enthalpy of formation for hydrogen gas is zero. (1 mark)
- January 2012, CHEM5 (old spec), Q2(a) (1 mark): State the meaning of the symbol in ΔH . (1 mark)
- January 2012, CHEM5 (old spec), Q2(d) (1 mark): The freezing of water is an exothermic process. Give one reason why the temperature of a sample of water can stay at a constant value of 0 oC when it freezes. (
- January 2012, CHEM2 (old spec), Q4(b)(iii) (3 marks): State the meaning of the term standard enthalpy of combustion.
- January 2012, CHEM2 (old spec), Q4(d)(i) (1 mark): Write an equation for the reaction that represents the standard enthalpy of formation of carbon dioxide. (1 mark)
- January 2012, CHEM2 (old spec), Q4(d)(ii) (1 mark): State why the value quoted in part (c) for the standard enthalpy of formation of CO2(g) is the same as the value for the standard enthalpy of combustion of carb
- June 2011, CHEM2 (old spec), Q2(b) (1 mark): Give the meaning of the term enthalpy change. (1 mark)
- June 2011, CHEM2 (old spec), Q2(d) (3 marks): Define the term standard enthalpy of formation.
- June 2011, CHEM2 (old spec), Q2(e)(i) (1 mark): State why the value for the standard enthalpy of formation of Na(I) is not zero. (1 mark)
- January 2011, CHEM2 (old spec), Q9(c)(i) (3 marks): Give the meaning of the term standard enthalpy of combustion.
- June 2010, CHEM5 (old spec), Q1(b)(i) (3 marks): Define the term standard enthalpy of formation.
- June 2010, CHEM5 (old spec), Q1(b)(ii) (1 mark): Write an equation, including state symbols, for the process that has an enthalpy change equal to the standard enthalpy of formation of calcium fluoride. (1 mark
- June 2010, CHEM2 (old spec), Q1(a)(ii) (1 mark): Use the diagram to deduce whether the formation of hydrogen iodide from hydrogen and iodine is exothermic or endothermic. (1 mark)
- June 2010, CHEM2 (old spec), Q1(a)(iv) (2 marks): In terms of p and q, identify the following for this equilibrium without a catalyst. A value for the activation energy for the forward reaction A value for the
- June 2010, CHEM2 (old spec), Q4(c)(ii) (1 mark): State one condition necessary for enthalpies of formation to be quoted as standard values at a specified temperature of 298 K. (1 mark)
- January 2010, CHEM2 (old spec), Q2(a) (1 mark): State the meaning of the term enthalpy change. (1 mark)
- January 2010, CHEM2 (old spec), Q5(a)(iii) (1 mark): Suggest a reason why the catalyst remains hot during the reaction. (1 mark)
- June 2009, CHEM2 (old spec), Q2(a)(i) (3 marks): 2 (a) (i) State what is meant by the term standard enthalpy of formation. (3 marks)
- June 2009, CHEM2 (old spec), Q2(a)(ii) (1 mark): 2 (a) (ii) State why the standard enthalpy of formation of barium and that of aluminium are both zero. (1 mark)
- June 2008, CHM2 (2008 spec), Q2(a) (3 marks): 2 (a) Define the term standard enthalpy of combustion. (3 marks)
- June 2008, CHM5 (2008 spec), Q3(a) (1 mark): 3 (a) Write an equation to represent the formation of one mole of ammonia from its elements. (1 mark)
- January 2008, CHM2 (2008 spec), Q3(a) (3 marks): 3 (a) Define the term standard enthalpy of combustion. (3 marks)
- January 2008, CHM2 (2008 spec), Q3(d) (1 mark): (d) State how you would expect the value obtained in part (c) to differ if gaseous water, rather than liquid water, is formed. (1 mark)
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