Summary

• Description:

  The MS Word document comprises BUNTRA Joint Examination Chemistry Paper 2 2025 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It is a KCSE Chemistry Paper 2 (233/2) BUNTRA Joint Exams (May 2025) examination.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 7 (Questions 1–7)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Electrochemistry (standard electrode potentials, reactivity series, cell e.m.f., cell diagrams, and salt bridge suitability)
  • Electrolysis (electrolysis of molten salts, products at electrodes, safety precautions, Faraday calculations, and selective discharge factors)
  • Periodic trends, bonding and structure (electron configurations of ions, ionic/giant covalent structures, and explaining melting point differences using bonding)
  • Oxides and periodicity (acidic/basic/neutral oxides; identifying likely elements from oxide properties)
  • Chromatography (leaf pigment extraction, origin/solvent front, and solvent choice)
  • Organic chemistry (combustion analysis and identifying liquids; functional groups from reactions; propyne reaction scheme, reagents/conditions, oxidation, polymerisation, and vulcanisation)
  • Soaps and detergents (advantages and disadvantages; hard water considerations)
  • Halogens and hydrogen halides (preparation, drying and collection of chlorine; chlorine test with moist litmus; industrial manufacture/absorption to form hydrochloric acid)
  • Rates of reaction (zinc with hydrochloric acid: plotting gas volume vs time, interpreting plateaus, and comparing rates at different concentrations)
  • Chemical equilibrium (Le Chatelier’s principle and shifting equilibria using NaOH)
  • Metals and extraction (steps in extracting lead from an ore, equations, reducing agents, tetraethyl lead in petrol, galena considerations, and general physical properties of metals)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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