Summary

• Description:

  The MS Word document comprises CEKENAS Chemistry Paper 1 2026 Pre-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 CEKENAS Form 4 Chemistry Paper 1 pre-mock examination designed to assess fundamental principles of physical, inorganic, and organic chemistry. This paper serves as an ideal revision tool for KCSE candidates looking to master core chemical concepts and practice with downloadable PDF resources and answers.

  • Month Administered: March/April 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 26 (Questions 1–26)
  • Structure: Single compulsory theory section comprising 26 short-answer and structured questions.

  It covers the following topics:

  • Bunsen burner flames and heating zones (Luminous vs. non-luminous flame testing with a wooden splint)
  • Group 1 alkali metals reaction with cold water
  • pH scale and solution classification (Aqueous magnesium chloride, ammonia, antacids)
  • Laboratory preparation and drying of oxygen gas from sodium peroxide
  • Periodic table trends, first ionization energy, and chemical reactivity
  • Atomic structure, periodic table arrangement, and ionic radius of trivalent ions
  • Chemical bonding and Lewis dot-and-cross diagrams (Carbon monoxide and sodium oxide)
  • Carbon allotropes (Diamond structure in rock drilling, graphite structure as a lubricant)
  • Electrolysis of molten aluminum oxide
  • Gas laws and stoichiometry (Avogadro's law, Haber process gas volume calculations, reacting masses for SO2 from sodium sulfite)
  • Industrial manufacture and laboratory reactions of hydrochloric acid and lead (II) nitrate
  • Haber process for ammonia production (Sources, catalysts, and industrial uses)
  • Solubility and dissolution of gases (Dissolving ammonia in water vs. methylbenzene)
  • Acid-base volumetric analysis and molar concentration calculations (Nitric (V) acid purity and dilution calculations)
  • Empirical and molecular formula determination from combustion data
  • Detergents and cleansing agents (Soaps vs. soapless detergents in hard water containing Ca2+)
  • Organic chemistry (Ester structure, nomenclature, and preparation from alkanoic acids and alkanols)
  • Water hardness and softening methods (Permutit / ion exchange process and reactivation)
  • Brønsted-Lowry acid-base theory
  • Thermochemistry (Determining molar heat of neutralization)
  • Acid strength and ionization comparison (Hydrochloric acid vs. methanoic acid)
  • Salt preparation (Precipitation / double decomposition of insoluble copper salts)
  • Solubility calculations and temperature dependence
  • Chemical equilibrium and Le Chatelier's principle (Yield optimization and energy level diagrams)
  • Allotropes and industrial applications of sulfur
• File Size:

  309.08 KB
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

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