AQA A-Level Chemistry AS Paper 1, June 2025
Every question from AQA A-Level Chemistry AS Paper 1, June 2025 (7404): 22 questions, 80 marks, each with its mark scheme and topic.
- Question 1 6 marks
Calculate the atom economy of TiCl4 formation, suggest an economic advantage of high atom economy, write the equation for reduction of TiCl4 using magnesium, and explain why magnesium is expensive.
Physical Chemistry · Inorganic Chemistry · 3.1.2 Amount of Substance · 3.1.7 Oxidation, Reduction and Redox Equations · 3.2.2 Group 2, The Alkaline Earth Metals
- Question 2 14 marks
Explain the trends and reactions of the halogens and halides, including intermolecular forces, reactions of chlorine with water and alkali, redox half-equations, and reactions of halides with concentrated sulfuric acid.
Inorganic Chemistry · Physical Chemistry · 3.2.3 Group 7(17), The Halogens · 3.1.3 Bonding · 3.1.7 Oxidation, Reduction and Redox Equations
- Question 3 13 marks
Answer questions on electron configurations, relative atomic mass definition, TOF mass spectrometry principles, calculating relative atomic mass from isotopic abundances, and determining the mass of an ion using time-of-flight data.
Physical Chemistry · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance
- Question 4 6 marks
Explain trends in melting point, atomic radius, and ionisation energy of Group 2 metals, and write equations for the reaction of barium with water and the second ionisation energy of calcium.
Inorganic Chemistry · Physical Chemistry · 3.2.2 Group 2, The Alkaline Earth Metals · 3.1.3 Bonding · 3.1.1 Atomic Structure
- Question 5 8 marks
Determine the relative molecular mass of a diprotic acid from titration data, calculate the burette percentage uncertainty, and suggest how to reduce it.
Physical Chemistry · Required Practicals · 3.1.2 Amount of Substance · Required Practical 1: Making up a volumetric solution
- Question 6 7 marks
Identify two unknown inorganic compounds using test-tube reaction observations, write ionic equations for the reactions, and describe a test for hydroxide ions.
Inorganic Chemistry · Required Practicals · 3.2.2 Group 2, The Alkaline Earth Metals · 3.2.3 Group 7(17), The Halogens · Required Practical 4: Carry out simple test-tube reactions to identify Cations and Anions
- Question 7 11 marks
Draw a concentration-time graph for HI, explain the effect of temperature on yield using Le Chatelier's principle, and calculate the equilibrium constant Kc and its units for the reaction between carbon dioxide and hydrogen.
Physical Chemistry · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc
- Question 8 1 mark
Identify the correct chemical formula of gallium sulfate(VI).
Physical Chemistry · 3.1.2 Amount of Substance · 3.1.3 Bonding · 3.1.7 Oxidation, Reduction and Redox Equations
- Question 9 1 mark
Calculate the mass, in kg, of 2000 m³ of carbon monoxide gas at 100 kPa and 25 °C using the ideal gas equation.
Physical Chemistry · 3.1.2 Amount of Substance
- Question 10 1 mark
Calculate the percentage by mass of sodium in sodium sulfate(VI).
Physical Chemistry · 3.1.2 Amount of Substance
- Question 11 1 mark
Identify the diagram showing the correct arrangement and relative sizes of ions in solid sodium chloride.
Physical Chemistry · 3.1.3 Bonding
- Question 12 1 mark
Identify the correct chronological order of the discovery of the electron, nucleus, and neutron from earliest to latest.
Physical Chemistry · 3.1.1 Atomic Structure
- Question 13 1 mark
Calculate the maximum mass of sodium chloride produced from given masses of sodium and chlorine by identifying the limiting reagent.
Physical Chemistry · 3.1.2 Amount of Substance
- Question 14 1 mark
Identify which Period 3 element has the given successive ionisation energies from 1st to 6th.
Physical Chemistry · Inorganic Chemistry · 3.1.1 Atomic Structure · 3.2.1 Periodicity
- Question 15 1 mark
Identify which equilibrium reaction results in a lower yield of product when the pressure of the system is increased at constant temperature.
Physical Chemistry · 3.1.6 Chemical Equilibria, Le Chatelier's Principle and Kc
- Question 16 1 mark
Identify which element has atoms containing only two unpaired electrons from a choice of cobalt, magnesium, nickel, and phosphorus.
Physical Chemistry · 3.1.1 Atomic Structure
- Question 17 1 mark
Identify which silver halide(s) react with concentrated ammonia solution to form a colourless solution.
Inorganic Chemistry · 3.2.3 Group 7(17), The Halogens
- Question 18 1 mark
Identify which combination of hydrochloric acid and sodium hydroxide solutions produces the greatest temperature increase when mixed.
Physical Chemistry · 3.1.4 Energetics · 3.1.2 Amount of Substance
- Question 19 1 mark
Identify which of the given molecules (BF3, CO2, CCl4, or SCl2) is polar.
Physical Chemistry · 3.1.3 Bonding
- Question 20 1 mark
Identify the correct statement describing the electron transfer and oxidation state change when sulfur dioxide acts as a reducing agent.
Physical Chemistry · 3.1.7 Oxidation, Reduction and Redox Equations
- Question 21 1 mark
Calculate the volume of distilled water needed to dilute 25.0 cm³ of 2.00 mol dm⁻³ hydrochloric acid to a concentration of 0.0400 mol dm⁻³.
Physical Chemistry · 3.1.2 Amount of Substance
- Question 22 1 mark
Identify which quantity of gas contains the same number of atoms as a given volume of nitrogen gas at the same temperature and pressure.
Physical Chemistry · 3.1.2 Amount of Substance