AQA A-Level Chemistry Paper 2, 2019
Every question from AQA A-Level Chemistry Paper 2, 2019: 13 questions, 105 marks, each with its mark scheme and topic.
- Question 1 12 marks
Give equations, mechanisms, synthesis conditions, and explanations related to the preparation, base strength, and chirality of amines.
Organic Chemistry · 3.3.3 Halogenoalkanes · 3.3.7 Optical Isomerism · 3.3.11 Amines · 3.3.14 Organic Synthesis
- Question 2 12 marks
Complete practical distillation apparatus, explain purification with a separating funnel and drying agent, calculate percentage yield, and draw the electrophilic addition mechanism for cyclohexene and bromine.
Organic Chemistry · Physical Chemistry · Required Practicals · 3.1.2 Amount of Substance · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes · 3.3.5 Alcohols · Required Practical 5: Distillation of a product from a reaction · Required Practical 10: Preparation of a pure organic liquid
- Question 3 9 marks
Deduce the molecular formula and structure of isoprene from elemental composition, identify the monomer and stereoisomer of polybutadiene repeating units, and explain polymer non-biodegradability.
Physical Chemistry · Organic Chemistry · 3.1.2 Amount of Substance · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes · 3.3.12 Polymers
- Question 4 6 marks
Calculate initial rates from concentration change data, deduce the orders of reaction, and calculate the rate constant k and its units from given kinetic data.
Physical Chemistry · 3.1.9 Rate Equations
- Question 5 4 marks
Calculate a value for the Arrhenius constant, A, and state its units, given the rate constant at 25 °C and the activation energy.
Physical Chemistry · 3.1.9 Rate Equations
- Question 6 8 marks
Identify isomers using chemical tests, 1H NMR splitting patterns, 13C NMR symmetry, and infrared spectra.
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.5 Alcohols · 3.3.6 Organic Analysis · 3.3.15 Nuclear Magnetic Resonance Spectroscopy
- Question 7 7 marks
Name cyclopentanone and explain how and why it can be distinguished from cyclopent-3-en-1-ol by comparing their boiling points, 13C NMR spectra, and infrared spectra.
Organic Chemistry · Physical Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.8 Aldehydes and Ketones · 3.3.6 Organic Analysis · 3.3.15 Nuclear Magnetic Resonance Spectroscopy · 3.1.3 Bonding
- Question 8 10 marks
Analyze the synthesis of paracetamol from phenol and hydroquinone, including mechanism naming, equation balancing, nucleophilic addition-elimination mechanism, and stoichiometric mass calculation.
Organic Chemistry · Physical Chemistry · 3.3.10 Aromatic Chemistry · 3.3.9 Carboxylic Acids and Derivatives · 3.3.11 Amines · 3.3.14 Organic Synthesis · 3.1.2 Amount of Substance
- Question 9 4 marks
Answer questions on two-dimensional thin-layer chromatography (TLC) of a hydrolysed protein, including the reagent for hydrolysis, locating agent, deducing the number of amino acids, and the need for two solvents.
Organic Chemistry · Required Practicals · 3.3.13 Amino Acids, Proteins and DNA · 3.3.16 Chromatography · Required Practical 12: Separation and purification techniques
- Question 10 10 marks
Deduce the molecular formula of a dicarboxylic acid with Mr = 118, calculate the mass needed in a titration, analyze the 1H NMR spectrum of isomeric diols, and explain how high resolution mass spectrometry distinguishes them.
Physical Chemistry · Organic Chemistry · 3.1.2 Amount of Substance · 3.3.6 Organic Analysis · 3.3.9 Carboxylic Acids and Derivatives · 3.3.15 Nuclear Magnetic Resonance Spectroscopy
- Question 11 11 marks
Complete reactions and structures involving esters, biodiesel formation, stereochemistry, combustion, and infrared absorption of carbon dioxide.
Organic Chemistry · Physical Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.6 Organic Analysis · 3.3.9 Carboxylic Acids and Derivatives · 3.1.2 Amount of Substance
- Question 12 5 marks
Draw hydrogen bonds between complementary strands in a section of DNA, identify the component parts of a cytosine nucleotide, and explain the term complementary.
Organic Chemistry · Physical Chemistry · 3.3.13 Amino Acids, Proteins and DNA · 3.1.3 Bonding
- Question 13 7 marks
Draw the mechanism for the reduction of 2-methylbutanal by NaBH4, explain why alkenes do not react with NaBH4, and give a chemical test to confirm incomplete reduction.
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes · 3.3.6 Organic Analysis · 3.3.8 Aldehydes and Ketones