Edexcel A-Level Chemistry Paper 3, November 2020
Every question from Edexcel A-Level Chemistry Paper 3, November 2020 (9CH0): 10 questions, 120 marks, each with its mark scheme and topic.
- Question 1 4 marks
Give the reagents and observations to identify carbonate ions and sulfate ions in aqueous solutions.
Inorganic Chemistry · Core Practicals · Topic 4: Inorganic Chemistry and the Periodic Table · Core Practical 7: Identify unknown organic liquids and inorganic solids
- Question 2 10 marks
Describe and explain flame tests for Group 1 and Group 2 metal ions, including colours, experimental procedures, and electron transitions.
Inorganic Chemistry · Core Practicals · Topic 4: Inorganic Chemistry and the Periodic Table · Core Practical 7: Identify unknown organic liquids and inorganic solids
- Question 3 18 marks
Perform calculations and evaluate titration techniques for a weak acid-strong base titration experiment using sodium hydroxide and ethanoic acid.
Core Practicals · Physical Chemistry · Core Practical 3: Find the concentration of a solution of hydrochloric acid · Topic 5: Formulae, Equations and Amounts of Substance · Topic 12: Acid-base Equilibria
- Question 4 10 marks
Calculate enthalpy changes and construct an enthalpy level diagram for the hydration of copper(II) sulfate using experimental calorimetry data and Hess's law.
Physical Chemistry · Core Practicals · Core Practical 8: Determine the enthalpy change of a reaction using Hess’s law · Topic 5: Formulae, Equations and Amounts of Substance · Topic 8: Energetics I
- Question 5 14 marks
Extract and purify benzoic acid from a mixture including writing a neutralization equation, describing experimental purification techniques, and calculating the maximum number of molecules soluble in a given volume.
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 18: Organic Chemistry III · Topic 17: Organic Chemistry II · Topic 5: Formulae, Equations and Amounts of Substance
- Question 6 19 marks
Analyze the combustion, percentage composition, spectroscopic properties, and analytical data of aromatic substances containing -OH groups including phenol, phenylmethanol, and benzoic acid.
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 · Topic 17: Organic Chemistry II
- Question 7 6 marks
Discuss cobalt(II) complex ions with different coordination numbers, including reference to difference in colour, definitions of terms used, and explanations of their different shapes.
Inorganic Chemistry · Topic 15: Transition Metals
- Question 8 15 marks
Investigate chromium chemistry including qualitative reactions of chromium(III), oxidation and reduction half-equations, interconversion of chromate(VI) and dichromate(VI), and drawing an electrochemical cell apparatus.
Inorganic Chemistry · Physical Chemistry · Core Practicals · Topic 15: Transition Metals · Topic 14: Redox II · Core Practical 10: Construct electrochemical cells and measure electrode potentials
- Question 9 9 marks
Compare and contrast the preparation and basicity of phenylamine and butylamine, write the equation for the formation of an amide from propanoyl chloride and pentylamine, and identify the amine monomer from a given polyamide structure.
Organic Chemistry · Topic 18: Organic Chemistry III
- Question 10 15 marks
Complete the esterification mechanism, identify the location of an oxygen-18 isotope, calculate the standard molar entropy of ethyl ethanoate using Gibbs free energy, and compare the reaction of ethanol with ethanoic acid versus ethanoyl chloride.
Organic Chemistry · Physical Chemistry · Topic 17: Organic Chemistry II · Topic 13: Energetics II