omer uner
Classification: OCR Paper 2
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Last update: a month ago
Crash report
Chemistry (B) H033/02 June 2023
1. Group 2 chemistry: hydroxide solubility trends, ionic equations with Ba²⁺, mass-based concentration errors, titration-based metal identification with Mr calculation and uncertainty propagation
2. Halogen redox chemistry: Cl₂/Br⁻ displacement via oxidising power, confirmation of AgBr vs. AgI with ammonia, photographic reduction of Ag⁺ to Ag, phosphoric acid as halide test, iodine vapor colour with hot wire
3. Organic synthesis: aspirin esterification, recrystallisation modifications, yield and atom economy calculations, phenylethanol dehydration vs. phenylmethanol, primary alcohol oxidation, ester structure drawing, TLC and IR usage for product identification
4. Intermolecular forces: comparison of boiling points in CH₄, CH₃OH, HCHO based on London dispersion, hydrogen bonding, dipole–dipole interactions
5. Equilibria and industrial chemistry: Haber process dynamic equilibrium clarification, Kc concentration calculation, nitric acid synthesis from NH₃, stoichiometric mass calculation for ammonium nitrate, heterogeneous catalysis by Fe, Boltzmann distribution with catalysis marking
2. Halogen redox chemistry: Cl₂/Br⁻ displacement via oxidising power, confirmation of AgBr vs. AgI with ammonia, photographic reduction of Ag⁺ to Ag, phosphoric acid as halide test, iodine vapor colour with hot wire
3. Organic synthesis: aspirin esterification, recrystallisation modifications, yield and atom economy calculations, phenylethanol dehydration vs. phenylmethanol, primary alcohol oxidation, ester structure drawing, TLC and IR usage for product identification
4. Intermolecular forces: comparison of boiling points in CH₄, CH₃OH, HCHO based on London dispersion, hydrogen bonding, dipole–dipole interactions
5. Equilibria and industrial chemistry: Haber process dynamic equilibrium clarification, Kc concentration calculation, nitric acid synthesis from NH₃, stoichiometric mass calculation for ammonium nitrate, heterogeneous catalysis by Fe, Boltzmann distribution with catalysis marking