AQA A-Level Chemistry Paper 1, 2023
Every question from AQA A-Level Chemistry Paper 1, 2023: 10 questions, 105 marks, each with its mark scheme and topic.
- Question 1 10 marks
Answer questions on chromium complexes, including defining a complex, molecular shape of PF3, oxidation states, bonding, isomerism in [Cr(NH3)4Cl2]+, and completing a complex formation equation.
Inorganic Chemistry · Physical Chemistry · 3.2.5 Transition Metals · 3.1.3 Bonding
- Question 2 5 marks
Explain the function of a salt bridge, the effect of changes to an electrochemical cell on its EMF, and give the overall cell reaction.
Physical Chemistry · Required Practicals · 3.1.11 Electrode Potentials · Required Practical 8: Measuring the EMF of an electrochemical cell
- Question 3 6 marks
Write balanced chemical equations and displayed formulas for reactions involving Period 3 elements, magnesium, and their oxides.
Inorganic Chemistry · Physical Chemistry · 3.2.4 Properties of Period 3 Elements and Their Oxides · 3.2.2 Group 2, The Alkaline Earth Metals · 3.1.2 Amount of Substance
- Question 4 11 marks
Calculate mole fractions, partial pressure, and total pressure using Kp for the decomposition of nitrogen dioxide, and predict the effects of changing volume and temperature on equilibrium.
Physical Chemistry · 3.1.10 Equilibrium Constant Kp · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc · 3.1.2 Amount of Substance
- Question 5 16 marks
Use enthalpy data to calculate molar enthalpy of solution and second ionisation energy, complete a Born-Haber cycle for calcium chloride, explain trends in hydration and ionisation energy, and evaluate lattice enthalpies using the perfect ionic model.
Physical Chemistry · 3.1.8 Thermodynamics · 3.1.1 Atomic Structure · 3.1.3 Bonding
- Question 6 10 marks
Calculate masses, concentrations, and percentage errors, and describe the preparation and practical techniques involved in a titration between standard barium hydroxide and hydrochloric acid.
Physical Chemistry · Required Practicals · 3.1.2 Amount of Substance · Required Practical 1: Making up a volumetric solution
- Question 7 17 marks
Answer questions on the chemistry of aluminium complexes, including electron configuration, acidity, ligand reactions, EDTA bonding, and a back-titration calculation to find the water of crystallisation.
Physical Chemistry · Inorganic Chemistry · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance · 3.1.3 Bonding · 3.2.5 Transition Metals · 3.2.6 Reactions of Ions in Aqueous Solution
- Question 8 5 marks
Write electrode half-equations, calculate an electrode potential, and explain operational features and advantages of a methanol-oxygen fuel cell.
Physical Chemistry · 3.1.7 Oxidation, Reduction and Redox Equations · 3.1.11 Electrode Potentials
- Question 9 12 marks
Answer questions on time of flight (TOF) mass spectrometry including ionisation equations, determining mass number from flight time, ion detection, isotopic abundance calculations, and electrospray ionisation.
Physical Chemistry · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance
- Question 10 13 marks
Answer questions on weak acids including indicator selection, writing a Ka expression, calculating the pH of propanoic acid, calculating the buffer pH from a partial neutralisation, and explaining why a weak acid–weak base titration cannot use an indicator.
Physical Chemistry · 3.1.12 Acids and Bases