AQA A-Level Chemistry Paper 2, 2023
Every question from AQA A-Level Chemistry Paper 2, 2023: 9 questions, 105 marks, each with its mark scheme and topic.
- Question 1 7 marks
Rates of Reaction This question explores reaction rates, focusing on the use of a conical flask with NaHCO₃ and acids, calculating the rate of CO₂ loss from experimental data, deducing units for the rate, sketching a reaction curve for chloroethanoic acid compared to ethanoic acid, and explaining why chloroethanoic acid is stronger.
Physical Chemistry · Required Practicals · 3.1.3 Bonding · 3.1.5 Kinetics · Required Practical 7: Measuring the rate of reaction by an initial rate method
- Question 2 5 marks
Reaction Kinetics and Mechanism This question examines the kinetics of a reaction between A and B in the presence of an acid catalyst. It involves completing a table with rate data based on the rate equation: rate = k[B]²[H⁺]. Additionally, it requires analysing a proposed reaction mechanism to deduce the rate-determining step and justifying the choice based on the reaction's dependence on the concentrations of reactants.
Physical Chemistry · 3.1.9 Rate Equations
- Question 3 12 marks
Reaction Mechanisms This question covers intermediates in mechanisms, including nucleophilic addition–elimination, electrophilic substitution, and nucleophilic addition, requiring completion of diagrams with intermediates and curly arrows.
Organic Chemistry · 3.3.10 Aromatic Chemistry
- Question 4 15 marks
Synthesis of Butane-1,4-Diamine and Nylon 4,6 This question involves naming isomer W, drawing isomers from Reaction 1, identifying reagents and conditions for Reactions 2 and 3, deducing values for x and y in nylon 4,6 formation, and drawing sections of nylon 4,6 polymer to show hydrogen bonding.
Organic Chemistry · 3.3.4 Alkenes · 3.3.14 Organic Synthesis · 3.3.3 Halogenoalkanes · 3.3.12 Polymers · 3.3.11 Amines
- Question 5 11 marks
Spectroscopic Analysis of Compound Z This question involves identifying a bond from IR absorption, determining carbon environments using NMR data to deduce structural features of Z, and explaining difficulties in interpreting spectra without additional data, concluding with deducing the overall structure of Z.
Organic Chemistry · 3.3.6 Organic Analysis
- Question 6 14 marks
Identifying Organic Liquids and Fractional Distillation This question involves identifying reagents and corrections for chemical tests on liquids J, K, L, and M, determining reactions and observations for each test, and explaining the use of fractional distillation with appropriate labels for the apparatus.
Organic Chemistry · 3.3.6 Organic Analysis
- Question 7 10 marks
Gas Laws and Volume Calculations This question involves calculating the volume of propanone gas using the ideal gas equation, determining volume changes with temperature, evaluating uncertainty caused by balance precision, and calculating the total gas volume after the combustion of propanone.
Physical Chemistry · 3.1.2 Amount of Substance
- Question 8 19 marks
Biofuels and Energy Calculations This question involves completing a hydrolysis equation, calculating the enthalpy of combustion for palmitic acid, determining empirical formulas for a biofuel, identifying environmental problems of biofuel combustion, and calculating enthalpy changes using bond enthalpies and standard enthalpies of formation.
Physical Chemistry · Organic Chemistry · 3.1.4 Energetics · 3.1.2 Amount of Substance · 3.3.9 Carboxylic Acids and Derivatives
- Question 9 12 marks
Decomposition of Ethanoic Anhydride This question involves deducing the general formula for the ketene homologous series, completing a reaction mechanism with curly arrows, using the Arrhenius equation to calculate 𝑇 1 T 1 , and sketching the Maxwell–Boltzmann distribution to explain why the rate of reaction increases at a higher temperature.
Physical Chemistry · Organic Chemistry · 3.1.5 Kinetics · 3.1.9 Rate Equations · 3.3.1 Introduction to Organic Chemistry