Edexcel A-Level Chemistry AS Paper 2, June 2025
Every question from Edexcel A-Level Chemistry AS Paper 2, June 2025 (8CH0): 9 questions, 80 marks, each with its mark scheme and topic.
- Question 1 4 marks
Answer multiple choice questions on the molecular formula, electrophilic addition reactions, IUPAC nomenclature, and oxidation of myrcene and isoprene.
Organic Chemistry · Topic 6: Organic Chemistry I
- Question 2 1 mark
Identify which alkene must be named using the E/Z naming system rather than the cis/trans system.
Organic Chemistry · Topic 6: Organic Chemistry I
- Question 3 9 marks
Predict the enthalpy of combustion of hexan-1-ol, calculate the enthalpy change of combustion of octan-1-ol from calorimetry experimental data, and evaluate experimental errors.
Physical Chemistry · Topic 8: Energetics I
- Question 4 9 marks
Draw the mechanism for the reaction of 1-bromobutane with hydroxide ions, construct an enthalpy level diagram for an endothermic reaction, and explain trends and isomer differences in alcohol boiling temperatures based on intermolecular forces.
Organic Chemistry · Physical Chemistry · Topic 6: Organic Chemistry I · Topic 8: Energetics I · Topic 2: Bonding and Structure
- Question 5 9 marks
Use mass spectrometry and infrared spectroscopy data to identify an unbranched carboxylic acid, explain limitations of IR alone, and account for peak broadening due to hydrogen bonding.
Organic Chemistry · Physical Chemistry · Topic 7: Modern Analytical Techniques I · Topic 2: Bonding and Structure
- Question 6 19 marks
Answer questions on the reactions, preparation, purification, and stoichiometry of butan-1-ol and butan-2-ol, including calculating reacting masses, percentage yield, and detailing experimental procedures.
Organic Chemistry · Physical Chemistry · Core Practicals · Topic 6: Organic Chemistry I · Topic 5: Formulae, Equations and Amounts of Substance · Core Practical 5: Investigate the oxidation of ethanol
- Question 7 12 marks
Explain the choice of temperature and pressure for methanol synthesis using equilibria and kinetics, sketch a Maxwell–Boltzmann distribution showing catalysed and uncatalysed activation energies, and explain the catalyst's effect.
Physical Chemistry · Topic 9: Kinetics I · Topic 10: Equilibrium I
- Question 8 8 marks
Determine the equilibrium constant expression, calculate product yield difference with a catalyst, define heterogeneous catalysis, explain its mechanism, and identify exhaust pollutants and products.
Physical Chemistry · Organic Chemistry · Inorganic Chemistry · Topic 11: Equilibrium II · Topic 9: Kinetics I · Topic 6: Organic Chemistry I · Topic 15: Transition Metals
- Question 9 9 marks
Complete an enthalpy cycle and calculate the standard enthalpy change of formation of butane from combustion data, and state the standard conditions.
Physical Chemistry · Topic 8: Energetics I