OCR A-Level Chemistry AS Depth in chemistry (02), June 2025
Every question from OCR A-Level Chemistry AS Depth in chemistry (02), June 2025 (H032): 6 questions, 70 marks, each with its mark scheme and topic.
- Question 1 8 marks
Define an alkali, write an ionic neutralisation equation, calculate the enthalpy change of neutralisation from temperature change data, and explain the effect of using a more concentrated solution on the temperature rise.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 2.1 Atoms and reactions · 3.2 Physical chemistry · PAG 3: Enthalpy determination
- Question 2 12 marks
Explain the trends and reactions of Group 2 elements, and calculate and evaluate the volume of carbon dioxide produced from barium carbonate and nitric acid.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · PAG 1: Moles determination · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 3.1 The periodic table
- Question 3 11 marks
Determine the mass of malic acid in a tablet from titration data, evaluate the effect of rinsing a burette with water, and draw the cis and trans stereoisomers formed by dehydration.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · PAG 2: Acid-base titration · 2.1 Atoms and reactions · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis
- Question 4 17 marks
State and explain the trend in boiling points of alkanes, perform combustion calculations and draw an enthalpy profile diagram, and describe the isomerism and free-radical substitution of alkanes.
Module 4: Core organic chemistry · Module 3: Periodic table and energy · Module 2: Foundations in chemistry · 4.1 Basic concepts and hydrocarbons · 3.2 Physical chemistry · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure
- Question 5 16 marks
Deduce the bonding and shapes of chloromethane and chloroethene, outline the purification and yield calculation of 2-chlorobutane, and identify reagents and intermediates in an alkene reaction sequence.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 1.2 Practical skills assessed in the practical endorsement · PAG 5: Synthesis of an organic liquid · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis
- Question 6 6 marks
Identify fragment ions and isotopic peaks from a mass spectrum of butanone, and interpret an infrared spectrum of an isomer to deduce functional groups.
Module 4: Core organic chemistry · 4.2 Alcohols, haloalkanes and analysis