OCR A-Level Chemistry Unified chemistry (03), June 2019
Every question from OCR A-Level Chemistry Unified chemistry (03), June 2019 (H432): 6 questions, 70 marks, each with its mark scheme and topic.
- Question 1 9 marks
Answer short questions on dipole moments in CF4, water molecules with Mr of 20, partial pressure of O2, mass of CO2 from combustion of propane, rate dependence on pH, and number of oxygen atoms in P2O5.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · 5.1 Rates, equilibrium and pH
- Question 2 8 marks
Analyze the preparation and purification of benzoic acid from phenylmethanol, including writing relevant equations, calculating the percentage yield, and describing the recrystallisation process.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 4: Core organic chemistry · Module 6: Organic chemistry and analysis · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 2.1 Atoms and reactions · 4.2 Alcohols, haloalkanes and analysis · 6.1 Aromatic compounds, carbonyls and acids · PAG 6: Synthesis of an organic solid
- Question 3 10 marks
Determine the empirical formula of a lead oxide from reduction experimental data, evaluate the experimental procedure, and compare the lattice structures and bonding of silicon dioxide and carbon dioxide.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 2.1 Atoms and reactions · 2.2 Electrons, bonding and structure · PAG 1: Moles determination
- Question 4 18 marks
Analyze the structure, acidity, spectra, and reactions of chloroxylenol and alpha-terpineol found in Dettol.
Module 4: Core organic chemistry · Module 5: Physical chemistry and transition elements · Module 6: Organic chemistry and analysis · 4.1 Basic concepts and hydrocarbons · 4.2 Alcohols, haloalkanes and analysis · 5.1 Rates, equilibrium and pH · 6.1 Aromatic compounds, carbonyls and acids · 6.2 Nitrogen compounds, polymers and synthesis · 6.3 Analysis
- Question 5 13 marks
Calculate the enthalpy change of hydration of anhydrous copper(II) sulfate using experimental thermochemical data and Hess's law, determine experimental temperature change from uncertainty, calculate standard entropy from Gibbs free energy data, and predict the bond angle, shape, and structure of sulfur-containing oxyanions.
Module 1: Development of practical skills in chemistry · Module 2: Foundations in chemistry · Module 3: Periodic table and energy · Module 5: Physical chemistry and transition elements · Practical Activity Groups · 1.1 Practical skills assessed in a written examination · 2.2 Electrons, bonding and structure · 3.2 Physical chemistry · 5.2 Energy · PAG 3: Enthalpy determination
- Question 6 12 marks
Identify compounds and write equations from an iron reaction flowchart, then determine the formulae of hydrated compound C and its thermal decomposition products D, E, F, and G using quantitative data.
Module 2: Foundations in chemistry · Module 5: Physical chemistry and transition elements · 2.1 Atoms and reactions · 5.2 Energy · 5.3 Transition elements