Summary

• Description:

  The MS Word document comprises KALA Trial Chemistry Paper 1 2026 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 1 (233/1) mock examination prepared for Kenya Certificate of Secondary Education candidates.

  This revision paper comprehensively tests key competencies in chemical bonding, stoichiometry, thermochemistry, reaction kinetics, organic reaction mechanisms, and qualitative analysis to boost student success in national examinations.

  • Month Administered: July 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 27 Questions (Questions 1 - 27)
  • Structure: Single compulsory theory paper comprising short-answer, qualitative, quantitative, and graphical questions

  It covers the following topics:

  • Structure and bonding: giant ionic structures, electrical conductivity, dative covalent bonds, and dot-and-cross diagrams
  • Separation of mixtures: paper chromatography and determination of dye purity
  • Allotropy: allotropes of sulphur and transition temperature
  • Thermochemistry: molar heat of formation, enthalpy changes, and molar heat of neutralization
  • Water and hydrogen: hardness of water, laboratory preparation and drying of hydrogen gas
  • Stoichiometry and the mole concept: reacting masses, empirical formulas, molecular formulas, and molar gas volume
  • Atomic structure and radioactivity: isotopic abundance, nuclear decay equations, and half-life calculations
  • Salts and solubility: preparation of insoluble salts by precipitation and fractional crystallization calculations
  • Organic chemistry: industrial manufacture of detergents, dehydration of alcohols, and addition polymerization
  • Gas laws: Graham's Law of diffusion calculations
  • Extraction of metals: electrolysis of bauxite in aluminium extraction and chemical properties of aluminium
  • Reaction kinetics: factors affecting reaction rates, surface area, concentration, and graphical representations
  • Electrochemistry: electrolysis of molten lead(II) iodide, Faraday's laws calculations, and cathode product deposition
  • Inorganic chemistry: reactions of sulphur(IV) oxide, laboratory preparation of nitrogen, and Solvay process chemistry
  • Qualitative analysis: cation identification schemes and precipitate solubility
  • Periodicity: physical and chemical trends of Period 3 chlorides
• File Size:

  295.66 KB
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Chemistry
• Posted By:

  Caleb_Peter

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