Summary

• Description:

  The MS Word document comprises BUNTRA Joint Examination Chemistry Paper 1 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 1 (233/1) mock examination.

  It covers the following topics:

  • Atomic structure and particles (neutrons vs electrons)
  • Electron configuration and electronic structure (e.g., nitrogen in HNO₃)
  • Separation of mixtures by boiling point differences (ethanol and hexane)
  • Reaction observations and equations from experimental set-ups (test-tube reactions)
  • Chemical bonding and basicity (dot-and-cross bonding in PH₃ and reaction with H⁺)
  • Rusting and corrosion prevention (rust formula; galvanization vs painting)
  • Periodic trends and compounds of elements (oxides and chlorides of Na, Mg, Al, Si)
  • Reactions of salts in solution (NaHCO₃ with AlCl₃ and expected observations)
  • Preparation of insoluble salts (preparing pure, dry zinc carbonate from zinc oxide)
  • Ionic equations (ethanoic acid with sodium hydrogen carbonate)
  • Gas diffusion (Graham’s law and diffusion-rate calculations)
  • Electrical conductivity of electrolytes (comparing sodium nitrate and calcium nitrate solutions)
  • Acid–base stoichiometry (NaOH neutralisation by sulphuric(VI) acid)
  • Organic chemistry and polymers (reaction conditions; monomers and polymer chain length calculations)
  • Redox reactions involving chlorine and iron(II) compounds (observations and equations)
  • Laboratory preparation and properties of ammonia (reaction with heated copper(II) oxide; litmus behaviour)
  • Extraction of sulphur (method of extracting sulphur from deposits and ores)
  • Laboratory preparation of aqueous hydrogen chloride and related apparatus diagrams
  • Brønsted–Lowry acid–base concepts (identifying an acid in NH₃ + H₂O equilibrium)
  • Water hardness (methods of removing permanent hardness)
  • Energetics using bond energies (molar heat of formation of ammonia)
  • Rates of reaction experiments (CaCO₃ with dilute HCl; plotting volume of gas vs time; rate from gradients)
  • Oxidation numbers (e.g., K₂Cr₂O₇ and HClO₃)
  • Electrochemistry (cell notation; meaning of salt bridge; E° cell calculations)
  • Metals and ores (main ores of iron and aluminium)
  • Radioactivity (half-life definition and half-life calculation from decay data)
  • Electroplating and Faraday’s laws (mass of silver deposited calculation)
  • Organic isomerism (drawing and naming isomers of butene)
  • Allotropy (reason carbon can have different melting points)
  • Reactions of concentrated sulphuric(VI) acid (property shown in reaction with NaCl)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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