OCR A-Level Chemistry Unified chemistry (03), June 2023
Every question from OCR A-Level Chemistry Unified chemistry (03), June 2023 (H432): 6 questions, 70 marks, each with its mark scheme and topic.
- Question 1 9 marks
Identify elements from the first 36 in the periodic table based on various chemical and physical descriptions including hydrogen bonding, successive ionisation energies, lattice structure, electron configuration, and atomic mass.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 3.1 The periodic table · 2.2 Electrons, bonding and structure · 2.1 Atoms and reactions
- Question 2 11 marks
Calculate the enthalpy change of solution for rubidium chlorate, determine the initial rate for a diluted hydrochloric acid solution, and complete the reaction mechanism for the formation of phenol from a benzenediazonium ion.
Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · Practical Activity Groups · 5.1 Rates, equilibrium and pH · 5.2 Energy · 6.1 Aromatic compounds, carbonyls and acids · PAG 3: Enthalpy determination · PAG 9: Rates of reaction – continuous monitoring method
- Question 3 6 marks
Describe the type of stereoisomerism shown by compound A and suggest three reactions for each of its functional groups, showing stereoisomers, reagents, conditions, and product structures.
Module 6: Organic chemistry and analysis · Module 4: Core organic chemistry · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 4.2 Alcohols, haloalkanes and analysis
- Question 4 10 marks
Calculate the masses of reactants needed to prepare a Tutton's salt, explain crystal growth conditions, and deduce the formulae of transition metal complex ions, precipitates, and test for sulfate ions.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Practical Activity Groups · 5.3 Transition elements · PAG 1: Moles determination · PAG 4: Qualitative analysis of ions · PAG 6: Synthesis of an organic solid · 3.1 The periodic table · 2.1 Atoms and reactions
- Question 5 11 marks
Determine the mass of aspirin in a tablet using back-titration data, draw a reflux apparatus, and complete a chemical equation for the reaction of aspirin with hot sodium hydroxide.
Module 2: Foundations in chemistry · Module 6: Organic chemistry and analysis · Practical Activity Groups · PAG 2: Acid-base titration · PAG 5: Synthesis of an organic liquid · 6.1 Aromatic compounds, carbonyls and acids · 2.1 Atoms and reactions
- Question 6 23 marks
Predict bond angles in nitric acid, write reaction equations including redox and acid-base reactions, calculate Kc for sulfur trioxide equilibrium, and determine formulae of compounds in reactions involving sulfuric acid.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 4: Core organic chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 6.1 Aromatic compounds, carbonyls and acids · 3.2 Physical chemistry · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 4.2 Alcohols, haloalkanes and analysis