OCR A-Level Chemistry Unified chemistry (03), June 2017
Every question from OCR A-Level Chemistry Unified chemistry (03), June 2017 (H432): 5 questions, 70 marks, each with its mark scheme and topic.
- Question 1 11 marks
Explain bond angles in water/ice, state concerns about methane release, determine formula of methane hydrate, calculate volume of released methane using ideal gas equation, and suggest an industrial interest in methane hydrate.
Module 2: Foundations in chemistry · Module 3: Periodic table and energy · 2.2 Electrons, bonding and structure · 2.1 Atoms and reactions
- Question 2 14 marks
Calculate the enthalpy change for the reaction of sodium oxide with water and apply Hess's Law, calculate percentage uncertainties in calorimetric measurements, suggest experimental improvements, name inorganic compounds systematically, determine oxidation numbers in a redox reaction, and construct a balanced chemical equation.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Practical Activity Groups · PAG 3: Enthalpy determination · 3.2 Physical chemistry · 2.1 Atoms and reactions · 1.1 Practical skills assessed in a written examination
- Question 3 14 marks
Determine the rate equation, activation energy, catalytic mechanism using electrode potentials, organic structure, and equilibrium amount for reactions involving hydrogen peroxide.
Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 5.1 Rates, equilibrium and pH · 5.2 Energy · 5.3 Transition elements · 6.1 Aromatic compounds, carbonyls and acids
- Question 4 19 marks
Calculate the molar mass and determine the alkyl group of weak acid A using titration data, write reaction equations for its reactions with magnesium and concentrated sulfuric acid, and calculate the mass of chromium(III) picolinate in a tablet.
Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · Practical Activity Groups · 5.3 Transition elements · PAG 2: Acid-base titration · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 4.2 Alcohols, haloalkanes and analysis · 2.1 Atoms and reactions
- Question 5 12 marks
Write expressions and equations involving thiols and carbonyl compounds, and explain chemical tests to distinguish between six organic compounds with pleasant smells.
Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis · 6.1 Aromatic compounds, carbonyls and acids · 6.3 Analysis