Edexcel A-Level Chemistry Paper 3, June 2025
Every question from Edexcel A-Level Chemistry Paper 3, June 2025 (9CH0): 9 questions, 120 marks, each with its mark scheme and topic.
- Question 1 7 marks
Define first ionisation energy, deduce the group to which elements X, Y, and Z belong using successive ionisation energy data, and explain which element has the highest atomic number.
Physical Chemistry · Inorganic Chemistry · Topic 1: Atomic Structure and the Periodic Table · Topic 4: Inorganic Chemistry and the Periodic Table
- Question 2 14 marks
Answer questions on the reactions, mechanism, bonding, isomerism, and water solubility of prop-2-en-1-ol and related unsaturated compounds.
Organic Chemistry · Physical Chemistry · Topic 6: Organic Chemistry I · Topic 2: Bonding and Structure
- Question 3 6 marks
Describe qualitative tests, observations, and deductions using only the provided reagents to identify ammonium carbonate, potassium carbonate, and potassium sulfate solutions.
Inorganic Chemistry · Core Practicals · Topic 15: Transition Metals · Core Practical 7: Identify unknown organic liquids and inorganic solids · Core Practical 15: Analyse organic and inorganic unknowns
- Question 4 17 marks
Investigate the kinetics of the reaction between iodine and propanone under acidic conditions using a titrimetric method, including risk assessment, calculation of quantities in excess, and graph analysis to determine reaction order.
Physical Chemistry · Core Practicals · Topic 16: Kinetics II · Topic 5: Formulae, Equations and Amounts of Substance · Core Practical 13a: Follow the rate of the iodine-propanone reaction by a titrimetric method
- Question 5 12 marks
Determine the empirical formula and 3D structure of a cobalt complex, define dynamic equilibrium, and explain complex stability using equilibrium and entropy concepts.
Physical Chemistry · Inorganic Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 10: Equilibrium I · Topic 13: Energetics II · Topic 15: Transition Metals
- Question 6 9 marks
Deduce the intermediates and reagents in a Grignard synthesis of 2-methyl-1-phenylpropan-2-ol and predict chemical shifts, peak areas, and splitting patterns in a proton NMR spectrum.
Organic Chemistry · Topic 17: Organic Chemistry II · Topic 18: Organic Chemistry III · Topic 19: Modern Analytical Techniques II
- Question 7 14 marks
Analyse the concentration of ethanol in an alcoholic drink using a back titration with acidified sodium dichromate(VI), potassium iodide, and sodium thiosulfate.
Physical Chemistry · Organic Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I · Topic 3: Redox I
- Question 8 20 marks
Calculate Ka values, plot and interpret an acid-base titration curve, evaluate data logging, and calculate buffer concentrations and explain buffer action.
Physical Chemistry · Core Practicals · Topic 12: Acid-base Equilibria · Core Practical 9: Finding the Ka value for a weak acid
- Question 9 21 marks
Complete the mechanism for the sulfonation of 1,4-dimethylbenzene, describe recrystallisation and dilution techniques, and perform back-titration calculations with error evaluation.
Organic Chemistry · Physical Chemistry · Core Practicals · Topic 18: Organic Chemistry III · Topic 5: Formulae, Equations and Amounts of Substance · Core Practical 2: Preparation of a standard solution from a solid acid · Core Practical 3: Find the concentration of a solution of hydrochloric acid