AQA A-Level Chemistry AS Paper 2, June 2025
Every question from AQA A-Level Chemistry AS Paper 2, June 2025 (7404): 22 questions, 80 marks, each with its mark scheme and topic.
- Question 1 14 marks
Explain the reactions and mechanisms of halogenoalkanes, including nucleophilic substitution with ammonia, elimination with hydroxide ions to form isomeric alkenes, and bonding in carbocation intermediates.
Organic Chemistry · Physical Chemistry · 3.3.3 Halogenoalkanes · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes · 3.1.3 Bonding
- Question 2 8 marks
Describe the effect of a catalyst and temperature on reaction rate, and draw a diagram showing hydrogen bonding between two methanol molecules.
Physical Chemistry · 3.1.3 Bonding · 3.1.5 Kinetics
- Question 3 6 marks
Explain why CCl4 has a higher boiling point than CHCl3 by considering molecular shape, polarity, and intermolecular forces.
Physical Chemistry · 3.1.3 Bonding
- Question 4 4 marks
Deduce structures of isomers with formula C4H6O2 from chemical tests and infrared spectra, and draw the repeating unit of poly(vinyl acetate).
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes · 3.3.6 Organic Analysis · 3.3.9 Carboxylic Acids and Derivatives
- Question 5 7 marks
Explain how high resolution mass spectrometry distinguishes between compounds and calculate the relative molecular mass of a volatile liquid using ideal gas data.
Physical Chemistry · Organic Chemistry · 3.1.2 Amount of Substance · 3.3.6 Organic Analysis
- Question 6 16 marks
Complete the reaction mechanism, calculations, practical distillation analysis, and combustion equations for the preparation and reactions of cyclohexanol.
Organic Chemistry · Physical Chemistry · Required Practicals · 3.1.2 Amount of Substance · 3.3.4 Alkenes · 3.3.5 Alcohols · Required Practical 5: Distillation of a product from a reaction
- Question 7 10 marks
Define enthalpy change, calculate the mass of ethanol burned using calorimetry data, show the bond enthalpy expression for combustion products of an alkane, and determine its molecular formula.
Physical Chemistry · Organic Chemistry · 3.1.4 Energetics · 3.1.2 Amount of Substance · 3.3.2 Alkanes
- Question 8 1 mark
Identify the IUPAC name of a branched aldehyde from its skeletal structure.
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.8 Aldehydes and Ketones
- Question 9 1 mark
Identify the correct statement regarding the combustion of petrol in internal combustion engines.
Organic Chemistry · 3.3.2 Alkanes
- Question 10 1 mark
Identify which statement regarding catalytic cracking is correct.
Organic Chemistry · 3.3.2 Alkanes
- Question 11 1 mark
Identify which alcohol produces the ketone (CH3)2CHCOCH3 upon oxidation.
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.5 Alcohols
- Question 12 1 mark
Identify the correct IUPAC name for a branched fluoroalkene including E/Z stereochemistry.
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.4 Alkenes
- Question 13 1 mark
Determine the molecular formula of the main organic product formed when 2-methylpentane-1,2,4-triol is refluxed with excess acidified potassium dichromate(VI).
Organic Chemistry · 3.3.1 Introduction to Organic Chemistry · 3.3.5 Alcohols
- Question 14 1 mark
Identify the correct statement regarding the properties and structure of sulfur dioxide.
Physical Chemistry · Inorganic Chemistry · Organic Chemistry · 3.1.3 Bonding · 3.2.4 Properties of Period 3 Elements and Their Oxides · 3.3.2 Alkanes
- Question 15 1 mark
Identify the equation showing a step in the decomposition of ozone by free radicals formed from CFCs.
Organic Chemistry · 3.3.3 Halogenoalkanes
- Question 16 1 mark
Identify which statement correctly describes the properties of crude oil fractions collected higher up in a fractionating column compared to those collected lower down.
Organic Chemistry · 3.3.2 Alkanes
- Question 17 1 mark
Identify which gas is not linked to global warming caused by the absorption of infrared radiation.
Organic Chemistry · 3.3.6 Organic Analysis
- Question 18 1 mark
Calculate the standard enthalpy of formation of benzene from standard enthalpies of combustion.
Physical Chemistry · 3.1.4 Energetics
- Question 19 1 mark
Identify which letter represents the mean energy of molecules at the lower temperature on a Maxwell–Boltzmann distribution curve.
Physical Chemistry · 3.1.5 Kinetics
- Question 20 1 mark
Deduce which reaction conditions produce a curve with the same initial rate but double the volume of hydrogen gas collected compared to an initial reaction between magnesium and hydrochloric acid.
Physical Chemistry · 3.1.2 Amount of Substance · 3.1.5 Kinetics
- Question 21 1 mark
Identify the correct equation for the free-radical substitution reaction of chlorine with excess ethane under ultraviolet light.
Organic Chemistry · 3.3.2 Alkanes
- Question 22 1 mark
Identify the equation that represents the standard enthalpy of formation of liquid iodoethane, C2H5I(l).
Physical Chemistry · 3.1.4 Energetics