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Classification: OCR Paper 2
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Crash report
Chemistry (A) H032/02 June 2023
1. Atomic structure and industrial processes: titanium isotope mass spectrometry, electron configuration, Ti²⁺ ion composition, titanium extraction via TiCl₄ and Na, percentage yield calculation, separation via solubility difference at room temperature
2. Period 3 chemistry: reactions of Ca and Ba with water, precipitation of BaSO₄ from Ba(NO₃)₂ and Na₂SO₄, percentage mass of NaCl via gravimetric analysis, lattice structures (MgS ionic, Al metallic, Si giant covalent, PCl₃ simple molecular), conductivity and melting point comparison
3. Halogens and hydrolysis: Cl₂ displacing I⁻ in seawater with mass-to-volume conversion for 1 tonne I₂, disproportionation in Cl₂ with Ca(OH)₂ (oxidation number justification), hydrolysis of 2-bromopropane via nucleophilic substitution (SN2 mechanism), rate comparison between 2-bromopropane and 2-iodopropane using AgNO₃ test
4. Enthalpy and energetics: combustion definition, ΔcH of butan-1-ol from experimental data (including % uncertainty, heat loss analysis, and improvement suggestions), ΔcH of ethanol via bond enthalpy calculation, methoxymethane vs ethanol ΔcH difference due to bond type and energy changes
2. Period 3 chemistry: reactions of Ca and Ba with water, precipitation of BaSO₄ from Ba(NO₃)₂ and Na₂SO₄, percentage mass of NaCl via gravimetric analysis, lattice structures (MgS ionic, Al metallic, Si giant covalent, PCl₃ simple molecular), conductivity and melting point comparison
3. Halogens and hydrolysis: Cl₂ displacing I⁻ in seawater with mass-to-volume conversion for 1 tonne I₂, disproportionation in Cl₂ with Ca(OH)₂ (oxidation number justification), hydrolysis of 2-bromopropane via nucleophilic substitution (SN2 mechanism), rate comparison between 2-bromopropane and 2-iodopropane using AgNO₃ test
4. Enthalpy and energetics: combustion definition, ΔcH of butan-1-ol from experimental data (including % uncertainty, heat loss analysis, and improvement suggestions), ΔcH of ethanol via bond enthalpy calculation, methoxymethane vs ethanol ΔcH difference due to bond type and energy changes