OCR A-Level Chemistry Unified chemistry (03), November 2021
Every question from OCR A-Level Chemistry Unified chemistry (03), November 2021 (H432): 5 questions, 70 marks, each with its mark scheme and topic.
- Question 1 18 marks
Answer a series of short chemistry questions covering partial pressure, equilibrium constants, boiling points and intermolecular forces, percentage composition and stoichiometry, reactions of carboxylic acids, and organic reaction mechanisms.
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 · 5.1 Rates, equilibrium and pH · 3.1 The periodic table · 4.2 Alcohols, haloalkanes and analysis · 2.1 Atoms and reactions · 6.2 Nitrogen compounds, polymers and synthesis
- Question 2 9 marks
Determine the correct ionic equation for the reaction of europium with dilute aqueous acid by analyzing experimental gas collection results, evaluating temperature effects, and predicting precipitate masses.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · PAG 1: Moles determination · 2.1 Atoms and reactions
- Question 3 12 marks
Describe the preparation of a standard barium hydroxide solution and use titration results involving an unsaturated carboxylic acid to determine two possible cis stereoisomer structures.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Practical Activity Groups · PAG 2: Acid-base titration · 4.1 Basic concepts and hydrocarbons · 2.1 Atoms and reactions
- Question 4 11 marks
Investigate the reaction kinetics between pent-1-ene and iodine, determining reaction orders, initial rates, rate constants, and reaction mechanisms from experimental data and concentration-time graphs.
Module 5: Physical chemistry and transition elements · Practical Activity Groups · 5.1 Rates, equilibrium and pH · PAG 9: Rates of reaction – continuous monitoring method
- Question 5 20 marks
Calculate the mass of sodium azide decomposed using the ideal gas equation, determine the pH of a hydrazoic acid solution, write equations for acid-base and organic reactions involving hydrazoic acid, and identify unknown substances E-J from reaction data and an IR spectrum.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 5.1 Rates, equilibrium and pH · 2.1 Atoms and reactions · 6.2 Nitrogen compounds, polymers and synthesis · 6.3 Analysis