Summary

• Description:

  The PDF document comprises The Elites Jet Chemistry Paper 2 2025 Mock Exam with Marking Scheme.

  It is a KCSE Chemistry (Theory) Paper 2 (233/2) Pre-Mock March 2025 examination.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 7 (Questions 1–7)
  • Instructions: Answer all questions in the spaces provided. Mathematical tables and silent electronic calculators may be used, and all workings must be clearly shown where necessary.
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Periodic table and periodic trends (reactivity, atomic radius comparisons, regions in the periodic table)
  • Ions and ionic/atomic radii, electron arrangements, and reactivity comparisons
  • Preparation and properties of ammonia (collection method, alkalinity, reactions with acids, and salt crystallisation)
  • Stoichiometry (molar gas volume at RTP; mass calculations for ammonium phosphate)
  • Preparation of salts (lead(II) sulphate) and separation of mixtures using solvents, water, and heating
  • Thermal decomposition calculations (sodium hydrogen carbonate; residue mass and CO2 volume at STP)
  • Qualitative analysis and ionic equations (formation of precipitates; complex ion formation with ammonia)
  • Organic chemistry (fermentation to ethanol, structural formula, distillation to obtain concentrated ethanol, confirmation tests for ethanol)
  • Organic reaction pathways (oxidation, dehydration, hydrogenation/addition, polymer formation, and conversion to chloroalkanes)
  • Soap and detergents (soap manufacture process; effect of hard water on soap efficiency using equations; types and advantages of detergents)
  • Biogas composition investigation (reaction over heated copper(II) oxide, products formed, observations, and reaction type)
  • Solubility curves and interpretation (KNO3 and CuSO4 data plotting, reading solubilities from a graph, crystallisation on cooling)
  • Hard water (definition and advantages)
  • Industrial chemistry (Solvay process flow chart for sodium carbonate manufacture and uses of sodium carbonate)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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