Edexcel A-Level Chemistry Paper 3, June 2019
Every question from Edexcel A-Level Chemistry Paper 3, June 2019 (9CH0): 10 questions, 120 marks, each with its mark scheme and topic.
- Question 1 6 marks
State the definition of a Bronsted-Lowry acid, identify conjugate pairs, define pH, calculate hydrogen ion concentration from pH, and explain why a very dilute strong acid does not have an alkaline or neutral pH.
Physical Chemistry · Topic 12: Acid-base Equilibria
- Question 2 7 marks
State standard conditions for electrode potentials, identify errors in an electrochemical cell diagram, and calculate silver ion concentration using the Nernst equation.
Physical Chemistry · Core Practicals · Topic 14: Redox II · Core Practical 10: Construct electrochemical cells and measure electrode potentials
- Question 3 8 marks
Devise a synthetic pathway to prepare propyl propanoate from 1-bromopropane, and deduce the structures of alcohol B and ester A based on their reactions.
Organic Chemistry · Topic 17: Organic Chemistry II · Topic 18: Organic Chemistry III · Topic 6: Organic Chemistry I
- Question 4 10 marks
Identify the ions and complex ions present in the pink crystalline compound C using test observations, deduce its formula, write an ionic equation for ammonia evolution, name the reaction type for ligand substitution, and explain the purpose of adding dilute hydrochloric acid in the sulfate test.
Inorganic Chemistry · Core Practicals · Core Practical 7: Identify unknown organic liquids and inorganic solids · Topic 15: Transition Metals
- Question 5 11 marks
Answer questions on redox reactions, including oxidation numbers, redox definitions, standard electrode potentials, disproportionation, dot-and-cross diagrams, and organic reaction mechanisms.
Physical Chemistry · Organic Chemistry · Topic 17: Organic Chemistry II · Topic 2: Bonding and Structure · Topic 3: Redox I · Topic 14: Redox II
- Question 6 14 marks
Deduce the coordination number and overall charge of a chromium complex ion, explain factors affecting transition metal ion colours using iron or copper examples, plot a graph of partial pressure against time for the catalytic decomposition of ammonia, determine the rate equation and rate constant, and describe the stages in heterogeneous catalysis.
Inorganic Chemistry · Physical Chemistry · Topic 15: Transition Metals · Topic 16: Kinetics II
- Question 7 17 marks
Determine the values of y and z in the hydrated salt KH3(C2O4)y.zH2O using titration data and mass measurements from thermal decomposition.
Physical Chemistry · Core Practicals · Core Practical 3: Find the concentration of a solution of hydrochloric acid · Topic 5: Formulae, Equations and Amounts of Substance
- Question 8 15 marks
Describe and explain the preparation, purification, and calculation of yield/molecules for 1-bromobutane from butan-1-ol.
Organic Chemistry · Core Practicals · Physical Chemistry · Core Practical 7: Identify unknown organic liquids and inorganic solids · Core Practical 15: Analyse organic and inorganic unknowns · Core Practical 16: Synthesise aspirin from 2-hydroxybenzoic acid · Topic 6: Organic Chemistry I · Topic 18: Organic Chemistry III · Topic 5: Formulae, Equations and Amounts of Substance
- Question 9 16 marks
Discuss optical activity, preparation yields, ligand substitution in haemoglobin involving carbon monoxide, and the synthesis of alcohols and carboxylic acids using Grignard reagents.
Organic Chemistry · Inorganic Chemistry · Physical Chemistry · Topic 17: Organic Chemistry II · Topic 18: Organic Chemistry III · Topic 15: Transition Metals · Topic 5: Formulae, Equations and Amounts of Substance · Topic 6: Organic Chemistry I
- Question 10 16 marks
Deduce the molecular formula, empirical formula, and structure of organic compound D containing carbon, hydrogen, oxygen, and nitrogen based on combustion data, mass spectrometry, isomer structures, and 13C NMR.
Organic Chemistry · Physical Chemistry · Topic 6: Organic Chemistry I · Topic 7: Modern Analytical Techniques I · Topic 18: Organic Chemistry III · Topic 19: Modern Analytical Techniques II · Topic 5: Formulae, Equations and Amounts of Substance