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1. Halide and cation identification–bromine water test for halides, flame test or sodium ion test, precipitate formation with barium chloride
2. Alcohol oxidation–acidified potassium dichromate color change, structural differences between primary and tertiary alcohols
3. Enthalpy change–Mg + HCl reaction, temperature rise, calorimetry calculations, uncertainty reduction strategies, apparatus impact
4. Volumetric analysis–sodium carbonate titration with HCl, endpoint color change with methyl orange, titre calculation, percentage purity determination
5. Bromoethane synthesis–reaction of ethanol with NaBr and H₂SO₄, distillation setup, separation using funnel, purification using drying agents
6. Practical procedures–sandpaper cleaning of magnesium, anti-bumping granules role, drying agent selection, immiscibility of product layers

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

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Classification: Unit 3

Page count: 16

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Chemistry WCH13/01 January 2020 | Edexcel International AS Level Past Papers With Mark Scheme

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