AQA A-Level Chemistry Paper 1, 2021
Every question from AQA A-Level Chemistry Paper 1, 2021: 9 questions, 105 marks, each with its mark scheme and topic.
- Question 1 11 marks
Define enthalpy change, complete a Born–Haber cycle for calcium chloride, calculate lattice and solution enthalpies, and explain the trend in hydration enthalpy.
Physical Chemistry · 3.1.4 Energetics · 3.1.8 Thermodynamics
- Question 2 6 marks
Define mass number, determine subatomic particle numbers for titanium species, and calculate the percentage abundance of titanium-46 from isotopic data.
Physical Chemistry · 3.1.1 Atomic Structure
- Question 3 12 marks
Answer questions on the reactions, properties, bonding, and structures of Period 3 elements and their oxides.
Inorganic Chemistry · Physical Chemistry · 3.2.4 Properties of Period 3 Elements and Their Oxides · 3.2.1 Periodicity · 3.1.3 Bonding · 3.2.2 Group 2, The Alkaline Earth Metals · 3.1.2 Amount of Substance
- Question 4 25 marks
Discuss the catalytic behaviour of iron and its ions, perform an ideal gas calculation for the reaction of iron with hydrochloric acid, and explain the reactions and acidity of iron(II) and iron(III) aqua ions.
Physical Chemistry · Inorganic Chemistry · 3.1.2 Amount of Substance · 3.1.5 Kinetics · 3.2.5 Transition Metals · 3.2.6 Reactions of Ions in Aqueous Solution
- Question 5 11 marks
State and explain the effect of pressure on equilibrium yield, calculate the partial pressure of a reactant, determine the expression, value, and units for Kp, and deduce the effect of pressure on Kp.
Physical Chemistry · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc · 3.1.10 Equilibrium Constant Kp
- Question 6 16 marks
Explain the ionic product of water, evaluate temperature effects and calibrate a pH probe to determine pH changes and calculate mixture pH during a titration.
Physical Chemistry · Required Practicals · 3.1.12 Acids and Bases · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc · 3.1.2 Amount of Substance · Required Practical 9: Investigate how pH changes when a weak acid reacts with a strong base and when a strong acid reacts with a weak base
- Question 7 9 marks
Explain differences in standard entropy, state the temperature for zero entropy, and calculate the minimum temperature for reaction feasibility using enthalpy and entropy changes.
Physical Chemistry · 3.1.8 Thermodynamics
- Question 8 8 marks
Define electrochemical series, state standard conditions for the SHE, and use electrode potential data to identify species, deduce redox equations, and explain differences in potentials of transition metal complexes.
Physical Chemistry · Inorganic Chemistry · 3.1.11 Electrode Potentials · 3.2.5 Transition Metals
- Question 9 7 marks
Explain cell suitability, calculate standard EMF, and state half-equations for positive and negative electrodes in lithium cells.
Physical Chemistry · 3.1.7 Oxidation, Reduction and Redox Equations · 3.1.11 Electrode Potentials