AQA A-Level Chemistry Paper 2, 2022
Every question from AQA A-Level Chemistry Paper 2, 2022: 10 questions, 105 marks, each with its mark scheme and topic.
- Question 1 21 marks
Reaction of Butanone with Iodine This question examines the reaction between butanone and iodine, requiring the displayed formula and name of the product. It includes rate calculations, such as determining the rate constant (k) and the initial rate when concentrations are halved. Graph interpretation for temperature effects on rate, deducing time for specific reactions, activation energy calculation using the Arrhenius equation, and outlining the mechanism for a reaction with KCN are also included.
Physical Chemistry · Organic Chemistry · 3.1.9 Rate Equations · 3.3.1 Introduction to Organic Chemistry
- Question 2 11 marks
Tetrachloroethene Equilibrium and Environmental Impact This question explores equilibrium concepts in the production of tetrafluoroethene from chlorodifluoromethane. It involves calculations of equilibrium amounts and the equilibrium constant (Kc), with its expression and units. Additionally, it examines the effect of temperature on equilibrium yield and discusses the environmental issues caused by chlorodifluoromethane, contrasting its impact with pentane as a refrigerant alternative.
Physical Chemistry · Organic Chemistry · 3.1.6 Chemical Equilibria, Le Chatelier's Principle, and Kc · 3.3.3 Halogenoalkanes
- Question 3 11 marks
Reactions and Polymerisation of 2-Methylbut-1-ene This question examines the reactions and polymerisation of 2-methylbut-1-ene. It involves naming and outlining the electrophilic addition mechanism with concentrated sulphuric acid, drawing and explaining the formation of the minor product, representing the skeletal formula of a functional group isomer, and identifying the type of polymerisation along with drawing the repeating unit of the polymer formed.
Organic Chemistry · 3.3.4 Alkenes
- Question 4 9 marks
Proteins and Amino Acid Interactions This question focuses on the structure and properties of proteins and amino acids. It requires identifying the protein structure level depicted, drawing the structure of the –Cys–Ser– section of a protein, and naming the by-product of amino acid condensation. It also examines the strength of interactions between cysteine R groups versus serine and aspartic acid R groups and deducing the type of interaction between lysine and aspartic acid R groups in a protein.
Organic Chemistry · 3.3.13 Amino Acids, Proteins and DNA
- Question 5 12 marks
Preparation of Hexan-2-ol This question involves the preparation of hexan-2-ol from hex-1-ene using phosphoric acid as a catalyst. Key tasks include suggesting an additional safety precaution, explaining the reasons for adding distilled water and anhydrous magnesium sulfate during the procedure, and identifying potential organic impurities in the final distillate. Additionally, students are required to label vacuum filtration apparatus and calculate the mass of hexan-2-ol formed given a specific yield, using the density of hex-1-ene.
Organic Chemistry · Required Practicals · 3.3.5 Alcohols · Required Practical 5: Distillation of a product from a reaction
- Question 6 6 marks
Structure Determination of Compound X This question involves deducing the structure of compound X (C₂H₄O) using its infrared spectrum, ¹H NMR data, and ¹³C NMR spectrum. The IR spectrum indicates a C=O bond, while the NMR data reveal distinct chemical environments corresponding to a methyl group, a CH group, and a carbonyl group.
Organic Chemistry · 3.3.6 Organic Analysis · 3.3.15 Nuclear Magnetic Resonance Spectroscopy
- Question 7 6 marks
Ester Hydrolysis Mechanism This question focuses on the mechanism of ester hydrolysis using aqueous sodium hydroxide. You are asked to complete the curly arrow mechanism for the reaction, identify the type of reaction as nucleophilic addition-elimination, explain the role of CH₃O⁻ as a leaving group in step 3, and describe the use of soap as a product of the hydrolysis of vegetable oils (triesters).
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.9 Carboxylic Acids and Derivatives
- Question 8 7 marks
Electrophilic Substitution with Benzene This question involves the electrophilic substitution reaction of benzene with methanoyl chloride (HCOCl) in the presence of a catalyst. It asks you to write the reaction equation, name the organic product (benzaldehyde), identify the catalyst (anhydrous AlCl₃) used to generate the electrophile ([HCO]⁺), and outline the mechanism showing how benzene reacts with this electrophile to form the final product.
Organic Chemistry · 3.3.10 Aromatic Chemistry
- Question 9 12 marks
Analysis of Olive Oil Composition This question involves determining the amount of the unsaturated fat Y in olive oil using bromine titration. It asks for the justification of titration volumes, calculation of the amount of bromine in the target titre, and mass of olive oil needed. Additional steps include ensuring accurate mass measurement of olive oil and deducing the molecular formula of a compound identified via mass spectrometry, using the empirical formula C₅H₁₀O.
Physical Chemistry · Required Practicals · 3.1.1 Atomic Structure · 3.1.2 Amount of Substance · Required Practical 6: Tests for alcohol, aldehyde, alkene and carboxylic acid
- Question 10 10 marks
Reaction Scheme Analysis This question involves a multi-step reaction scheme, focusing on the formation of amines and derivatives. It requires identifying reagents for nitration (step 1) and reduction (step 2), naming the mechanism for acylation (step 3), and detailing the conditions for the formation of chloromethylbenzene (step 4). Further questions address differences in yields between amines A and B and the relative basicity of amine B compared to amine A.
Organic Chemistry · 3.3.11 Amines · 3.3.14 Organic Synthesis · 3.3.10 Aromatic Chemistry