Edexcel A-Level Chemistry AS Paper 2, June 2024
Every question from Edexcel A-Level Chemistry AS Paper 2, June 2024 (8CH0): 8 questions, 80 marks, each with its mark scheme and topic.
- Question 1 9 marks
Use titration data for an unknown dicarboxylic acid to determine the mean titre, the relative molecular mass of the acid, and the value of n in its molecular formula.
Physical Chemistry · Core Practicals · 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
- Question 2 9 marks
Explain equilibrium shifts for dichromate-chromate and nitrogen dioxide-dinitrogen tetroxide systems, and identify the equilibrium constant expression.
Physical Chemistry · Topic 10: Equilibrium I · Topic 11: Equilibrium II
- Question 3 17 marks
Deduce formulae, mechanism, stereoisomerism, and hydration reactions for the isomeric alkenes but-1-ene, but-2-ene, and methylpropene.
Organic Chemistry · Physical Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I
- Question 4 11 marks
Calculate the enthalpy change of dimerisation of ethene to cyclobutane using mean bond enthalpies, evaluate accuracy, complete a Hess's law cycle, and determine the enthalpy of formation.
Physical Chemistry · Topic 8: Energetics I
- Question 5 12 marks
Explain the experimental procedure for preparing and purifying 1-bromobutane from butan-1-ol, including safety precautions, side-reaction prevention, apparatus setup for distillation, and separation of immiscible layers.
Organic Chemistry · Inorganic Chemistry · Physical Chemistry · Topic 6: Organic Chemistry I · Topic 4: Inorganic Chemistry and the Periodic Table · Topic 9: Kinetics I · Topic 18: Organic Chemistry III
- Question 6 7 marks
Analyse the disappearing cross reaction between sodium thiosulfate and hydrochloric acid to determine reaction rate and the effect of concentration.
Physical Chemistry · Topic 9: Kinetics I · Topic 5: Formulae, Equations and Amounts of Substance
- Question 7 6 marks
Discuss, with reasons, the effects of increasing temperature and increasing pressure on the yield of methanol and the rate of reaction for the exothermic reaction of carbon dioxide and hydrogen.
Physical Chemistry · Topic 9: Kinetics I · Topic 10: Equilibrium I
- Question 8 9 marks
Write the combustion equation for methanol, calculate the theoretical final temperature of water in a calorimetry experiment, and evaluate the effect of balance precision on accuracy.
Physical Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 8: Energetics I