OCR A-Level Chemistry Unified chemistry (03), June 2022
Every question from OCR A-Level Chemistry Unified chemistry (03), June 2022 (H432): 6 questions, 70 marks, each with its mark scheme and topic.
- Question 1 16 marks
Answer questions on nitrogen compounds, brass isotope mass spectrometry, proton NMR of a diketone, and amino acid reactions and transition metal complexes.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 5.3 Transition elements · 6.2 Nitrogen compounds, polymers and synthesis · 6.3 Analysis · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure
- Question 2 13 marks
Calculate the concentration of calcium hypochlorite from a given volume of chlorine gas, write a disproportionation equation with oxidation numbers, explain chromium ion electrode potentials acting as oxidising or reducing agents, and construct a redox equation for hydrogen sulfide and manganate(VII).
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 5.3 Transition elements · 5.2 Energy · 2.1 Atoms and reactions
- Question 3 10 marks
Describe the preparation of 1-bromobutane by refluxing butan-1-ol with sodium bromide and sulfuric acid, including a reflux diagram, percentage yield calculation, purification steps, and the two-step mechanism.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · Practical Activity Groups · 4.2 Alcohols, haloalkanes and analysis · PAG 5: Synthesis of an organic liquid · PAG 7: Qualitative analysis of organic functional groups · 6.2 Nitrogen compounds, polymers and synthesis
- Question 4 8 marks
Explain the effect of temperature and silver nitrate addition on the cobalt complex equilibrium, including rates and enthalpy changes.
Module 5: Physical chemistry and transition elements · Module 3: Periodic table and energy · 5.1 Rates, equilibrium and pH · 5.3 Transition elements · 3.2 Physical chemistry
- Question 5 10 marks
Calculate the enthalpy change of solution and hydration of calcium ions from experimental calorimetry data, and determine the energy released from the combustion of an octane-ethanol fuel blend.
Module 5: Physical chemistry and transition elements · Module 3: Periodic table and energy · Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Practical Activity Groups · 5.2 Energy · 3.2 Physical chemistry · 1.1 Practical skills assessed in a written examination · 2.1 Atoms and reactions · PAG 3: Enthalpy determination
- Question 6 13 marks
Determine optical isomers, explain water solubility, deduce ester formula from carboxylic acid reaction, draw acid-base proton transfer curly arrow mechanism, calculate pH of weak acid solution, and determine vitamin C mass in orange juice via titration calculation.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 5.1 Rates, equilibrium and pH · 2.1 Atoms and reactions