Edexcel A-Level Chemistry AS Paper 2, November 2020
Every question from Edexcel A-Level Chemistry AS Paper 2, November 2020 (8CH0): 7 questions, 80 marks, each with its mark scheme and topic.
- Question 1 10 marks
Calculate the empirical formula and molecular formula of fluorine-containing organic refrigerants using mass spectrometry data and percentage composition, and write equations for free-radical substitution reactions.
Physical Chemistry · Organic Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I · Topic 7: Modern Analytical Techniques I
- Question 2 13 marks
Identify alcohol isomers, explain elimination reactions, define stereoisomers and geometrical isomerism, write oxidation and substitution equations for alcohols and halogenoalkanes.
Organic Chemistry · Topic 6: Organic Chemistry I
- Question 3 6 marks
Assess reaction kinetics concepts including activation energy definitions, reaction profiles with catalysts, heterogeneous catalysts, and Maxwell-Boltzmann distributions.
Physical Chemistry · Topic 9: Kinetics I
- Question 4 14 marks
Calculate the enthalpy of combustion of methanol using calorimetry and Hess's law, and explain the effects of temperature and pressure on equilibrium and reaction rate.
Physical Chemistry · Core Practicals · Topic 5: Formulae, Equations and Amounts of Substance · Topic 8: Energetics I · Topic 9: Kinetics I · Topic 10: Equilibrium I · Core Practical 8: Determine the enthalpy change of a reaction using Hess’s law
- Question 5 12 marks
Calculate the bond energy of I-Cl, draw bond dipoles and reaction mechanisms for addition to alkenes, calculate moles in titrations related to iodine numbers, and explain reaction rates of polar interhalogen molecules compared to halogens.
Physical Chemistry · Organic Chemistry · Topic 8: Energetics I · Topic 2: Bonding and Structure · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I
- Question 6 13 marks
Investigate the decomposition of aqueous hydrogen peroxide catalysed by manganese(IV) oxide by measuring oxygen gas volume, analysing rate data graphically, and describing a method to recover and test the heterogeneous catalyst.
Physical Chemistry · Core Practicals · Topic 9: Kinetics I
- Question 7 12 marks
Investigate the relative rates of substitution reactions of halogenoalkanes using test tube experiments and silver nitrate.
Organic Chemistry · Inorganic Chemistry · Core Practicals · Topic 6: Organic Chemistry I · Topic 4: Inorganic Chemistry and the Periodic Table · Core Practical 4: Investigate the hydrolysis of halogenoalkanes