Edexcel A-Level Chemistry AS Paper 2, June 2019
Every question from Edexcel A-Level Chemistry AS Paper 2, June 2019 (8CH0): 8 questions, 80 marks, each with its mark scheme and topic.
- Question 1 8 marks
Identify the unbranched alkane with six carbon atoms in kerosene, explain why its branched isomers have lower boiling temperatures, explain two reasons for cracking hydrocarbons, and determine the changes in organic molecule proportions resulting from reforming.
Organic Chemistry · Topic 6: Organic Chemistry I
- Question 2 10 marks
Describe characteristics of a homologous series, identify reaction reagents and mechanisms for alkenes and halogenoalkanes, and draw and name structural isomers.
Organic Chemistry · Topic 6: Organic Chemistry I
- Question 3 13 marks
Calculate enthalpy changes using definitions, reaction profile diagrams, Hess cycles, and mean bond enthalpies for various combustion and formation reactions.
Physical Chemistry · Topic 8: Energetics I
- Question 4 7 marks
Discuss the characteristics of dynamic equilibrium, the effects of temperature and pressure on the yield of methanol, and the role of a catalyst in its industrial manufacture.
Physical Chemistry · Topic 10: Equilibrium I · Topic 9: Kinetics I
- Question 5 13 marks
Investigate the elimination and substitution reactions of bromobutanes to produce butenes and butan-1-ol using experimental apparatus, calculations, mechanisms, and chemical tests.
Organic Chemistry · Physical Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I
- Question 6 13 marks
Calculate the percentage of ethanol oxidised in a sample of white wine using titration data and determine the brand of gin based on its ABV and density.
Physical Chemistry · Organic Chemistry · Core Practicals · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I · Core Practical 3: Find the concentration of a solution of hydrochloric acid
- Question 7 7 marks
Calculate the percentage composition by mass and deduce the displayed formulae of three isomers of C4H8O using IR spectroscopy and structural data.
Physical Chemistry · Organic Chemistry · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I · Topic 7: Modern Analytical Techniques I
- Question 8 9 marks
Plot concentration-time data for a catalytic reaction, describe how to find initial and maximum rates from tangents, explain why initial and maximum rates differ due to autocatalysis, and state why the initial rate measurement is less accurate.
Physical Chemistry · Core Practicals · Core Practical 13b: Use a clock reaction to determine a rate equation · Topic 9: Kinetics I