Chemistry WCH16/01 October 2021 | Edexcel International A Level Past Papers With Mark Scheme

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1. qualitative analysis—copper ion reactions with OH⁻ and Cl⁻, observation of color changes, test for SO₄²⁻ with Ba²⁺, electrochemical cell setup errors and EMF calculation

2. redox titration—Cu²⁺ reaction with I⁻ to form CuI and I₂, thiosulfate titration steps, mass and percentage copper in brass sample from titre data, apparatus choice and starch indicator timing

3. organic functional group tests—2,4-DNPH for carbonyls, Fehling’s test for aldehydes, mass spectrometry interpretation (m/z peaks), structure deduction from spectra

4. enthalpy of solution—temperature rise measurement, enthalpy change calculation using q = mcΔT, percentage uncertainty in thermometer reading, improved method with time-temperature graph

5. ester hydrolysis—reflux and distillation steps, identification of distillation setup errors, recrystallisation method for benzoic acid purification, purity check via melting point change

6. organic compound deduction—hydrolysis of C₆H₅COOR ester, test for alcohol (-OH), equation for benzoic acid formation, filtration method, structural deduction from molecular and NMR data

Edexcel International AS/A Level Chemistry (WCH) Oct 2021

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Classification: Unit 6

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Chemistry WCH16/01 October 2021 | Edexcel International A Level Past Papers With Mark Scheme

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