Summary

• Description:

  The PDF document comprises Kapsabet High School Chemistry Paper 1 2025 Mock Exam with Marking Scheme.

  It is a KCSE Chemistry (Theory) Paper 1 (233/1) Post Mock 2025 examination.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 29 (Questions 1–29)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Air oxidation/combustion reactions (e.g., burning magnesium)
  • Chemical bonding (ionic bonding and explanations using atomic numbers)
  • Acids, bases, solubility, and reactions in organic solvents (e.g., HCl in methylbenzene)
  • Industrial processes (Solvay process; manufacture of nitric(V) acid)
  • Thermal decomposition reactions (e.g., heating nitrates)
  • Qualitative analysis and complex ion formation (aqueous ammonia with copper(II) ions)
  • Indicators and pH comparison of strong vs weak bases
  • Energetics (activation energy; enthalpy of formation and combustion)
  • Rates/kinetic theory (Graham’s law of diffusion calculations)
  • Electrochemistry (electrolysis of aqueous silver nitrate; Faraday calculations)
  • Equilibrium (effect of adding dilute hydrochloric acid to a system at equilibrium)
  • Acid–base titration calculations (antacid neutralisation and percentage composition)
  • Preparation of salts and crystallisation (preparing sodium sulphate crystals)
  • Extraction of metals (aluminium from bauxite) and impurities in ores
  • Organic chemistry (miscibility/separation; hydrogenation of alkenes and industrial uses)
  • Radioactivity (types of radiation, half-life) and corrosion prevention (painting cars)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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