Chemistry WCH16/01 October 2020 | Edexcel International A Level Past Papers With Mark Scheme

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1. transition metal complex identification—Cu(OH)₂ formation, [Cu(NH₃)₄(H₂O)₂]²⁺ complex, thermal decomposition to black CuO, yellow [CuCl₄]²⁻ formation
2. chromate–dichromate equilibrium—CrO₄²⁻ yellow to Cr₂O₇²⁻ orange, Cr³⁺ green from ethanol reduction, ethanol oxidation to ethanal
3. structural isomers—C₄H₈O₂ compounds, ester vs acid, mass spec m/z 46 for ethanol, 43 for CH₃CO⁺ ion, acid–base reactions with NaHCO₃
4. proton NMR—chemical shifts, relative area ratios (1:6:1), splitting patterns to deduce structure of butanoic acid
5. rate equation determination—BrO₃⁻, Br⁻, H⁺ reaction, methyl red bleaching, use of reciprocal time (1/t) as rate proxy, first-order confirmation
6. aspirin synthesis—2-hydroxybenzoic acid with ethanoic anhydride, use of conc. H₂SO₄ catalyst, reflux apparatus corrections, excess reagent calculation
7. purification techniques—cooling, recrystallisation, Buchner filtration benefits, purity test via melting point comparison to pure aspirin reference

Edexcel International AS/A Level Chemistry (WCH) Oct 2020

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Chemistry WCH16/01 October 2020 | Edexcel International A Level Past Papers With Mark Scheme

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