Edexcel Chemistry Unit 3 Past Papers
IAS • WCH13/01
Externally assessed paper on practical chemistry from Units 1 and 2: planning, implementing, analysing and evaluating experimental work, including the AS core practicals.
Every Unit 3 question paper we hold, from 2019 to 2026, with its mark scheme and examiner report where available. Open any PDF in a new tab, or work through the topics below before you sit a full paper.
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What Unit 3 covers
- Core Practical 1: Measurement of the molar volume of a gas
Determine the molar volume of a gas by reacting magnesium with excess hydrochloric acid.
- Core Practical 2: Determination of the enthalpy change of a reaction using Hess's Law
Determine an enthalpy change indirectly using calorimetry and a Hess cycle.
- Core Practical 3: Finding the concentration of a solution of hydrochloric acid
Titrate hydrochloric acid against a standard alkali to find its concentration.
- Core Practical 4: Preparation of a standard solution from a solid acid and use it to find the concentration of a solution of sodium hydroxide
Prepare a standard solution of a solid acid and titrate it against sodium hydroxide.
- Core Practical 5: Investigation of the rates of hydrolysis of some halogenoalkanes
Compare the rates of hydrolysis of chloro-, bromo- and iodoalkanes using aqueous silver nitrate.
- Core Practical 6: Chlorination of 2-methylpropan-2-ol with concentrated hydrochloric acid
Prepare, separate and purify a halogenoalkane from a tertiary alcohol.
- Core Practical 7: The oxidation of propan-1-ol to produce propanal and propanoic acid
Distillation and reflux oxidation of a primary alcohol to the aldehyde and carboxylic acid.
- Core Practical 8: Analysis of some inorganic and organic unknowns
Qualitative tests to identify unknown cations, anions and organic functional groups.