AQA A-Level Chemistry Paper 1, 2019
Every question from AQA A-Level Chemistry Paper 1, 2019: 9 questions, 105 marks, each with its mark scheme and topic.
- Question 1 9 marks
Complete a Born–Haber cycle for caesium iodide, calculate the enthalpy of atomisation of iodine, evaluate the bonding character, and determine the feasibility of decomposition using Gibbs free energy.
Physical Chemistry · 3.1.8 Thermodynamics · 3.1.3 Bonding
- Question 2 10 marks
Describe electrospray ionisation, deduce relative molecular mass from a mass spectrum peak, and calculate the relative molecular mass of a molecule using time of flight data.
Physical Chemistry · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance
- Question 3 7 marks
Define periodicity, identify Period 4 elements by electronegativity and atomic radius trends with explanation, name the property of arsenic(III) oxide, and balance a chemical equation.
Inorganic Chemistry · Physical Chemistry · 3.2.1 Periodicity · 3.1.2 Amount of Substance · 3.1.3 Bonding · 3.2.4 Properties of Period 3 Elements and Their Oxides
- Question 4 14 marks
Identify reaction products, colours, and equations for aqueous iron complexes, suggest a reducing agent, and describe the shapes and isomerism of transition metal complexes with drawn examples.
Inorganic Chemistry · 3.2.5 Transition Metals · 3.2.6 Reactions of Ions in Aqueous Solution
- Question 5 13 marks
Identify products, observations, roles, and equations for reactions of Group 7 compounds with sulfuric acid, sodium hydroxide, and silver nitrate testing.
Inorganic Chemistry · Physical Chemistry · Required Practicals · 3.2.3 Group 7(17), The Halogens · 3.1.7 Oxidation, Reduction and Redox Equations · 3.2.5 Transition Metals · Required Practical 4: Carry out simple test-tube reactions to identify Cations and Anions
- Question 6 16 marks
Determine the percentage of copper in an alloy via iodometric titration, suggest ways to reduce experimental uncertainty, and carry out related calculations and transition metal explanations.
Physical Chemistry · Inorganic Chemistry · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance · 3.1.7 Oxidation, Reduction and Redox Equations · 3.2.5 Transition Metals
- Question 7 10 marks
Calculate equilibrium quantities, determine mole fractions, write the expression for Kp, find total pressure, and deduce enthalpy and modified equilibrium constants for the decomposition of sulfur trioxide.
Physical Chemistry · 3.1.2 Amount of Substance · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc · 3.1.10 Equilibrium Constant Kp
- Question 8 11 marks
Draw hydrogen bonding between ethanol molecules, explain the difference in boiling points between ethanol and methoxymethane, and determine the shapes and bond angles of POCl3 and ClF4-.
Physical Chemistry · 3.1.3 Bonding
- Question 9 15 marks
Explain water neutrality at 40 °C and find Kw, determine Ka from a pH curve, select an indicator, calculate the pH of a buffer after adding KOH, and explain why dilution has no effect on buffer pH.
Physical Chemistry · 3.1.2 Amount of Substance · 3.1.12 Acids and Bases