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1. transition metal complexes—[Ag(NH₃)₂]⁺ linear shape, d¹⁰ configuration causing colorlessness, redox reaction with glucose forming Ag mirror
2. electrochemical cells—cell potential from half-equations (Ag, VO₂⁺), cell notation, salt bridge function, electrode reactions
3. organic spectroscopy—IR, high-resolution NMR, and mass spectra for compound identification, splitting patterns and peak area interpretation
4. polymer synthesis—monomer structure from polymer repeat unit (addition and condensation), molar mass calculation for synthetic rubber
5. azo dye preparation—benzoic acid nitration, amine reduction, diazotisation with NaNO₂/HCl at low temperature, phenol coupling to form azo dye
6. cobalt complex ion reactions—precipitate formation with NaOH, ligand exchange with NH₃, color changes with HCl addition, balanced ionic equations

Edexcel International AS/A Level Chemistry (WCH) Jan 2022 Chemistry (WCH) directory

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Classification: Unit 5

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Chemistry WCH15/01 January 2022 | Edexcel International A Level Past Papers With Mark Scheme

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