Summary

• Description:

  The PDF document comprises Navakholo Joint Evaluation Test 1 Chemistry Paper 1 March 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 1 (Theory) examination. This paper tests candidates' conceptual and computational understanding of inorganic and organic chemistry through 29 structured short-answer questions covering a wide range of KCSE Chemistry topics.

  • Month Administered: March 2026
  • Duration: 2 hours
  • Total Marks: 80
  • Number of Questions: 29 (Questions 1–29)
  • Structure: All questions compulsory; calculators and KNEC mathematical tables permitted

  It covers the following topics:

  • Bunsen burner flame hotness; allotropes of sulphur (rhombic and monoclinic); physical properties of gases (H₂S, Cl₂, N₂O)
  • Inert electrodes; electrolysis of molten aluminium oxide
  • Relative Molecular Mass calculation from molecular mass (Avogadro's number)
  • Haber process — hydrogen source, catalyst, effect of temperature on ammonia yield
  • Separation techniques — distillation (propanone/water); separating funnel (water/octane)
  • Preparation of dry hydrogen sulphide — apparatus and collection
  • Dot and cross diagrams — C₂H₄ and hydroxonium ion (H₃O⁺)
  • Molar heat of neutralisation calculation; enthalpy change comparison (HCl vs. ethanoic acid)
  • Strong vs. concentrated acids; ammonia in methylbenzene vs. ammonia in water
  • Electronic configuration table — noble gas identification, atomic numbers, group/period classification, ionic compound formula
  • Hydrocarbon identification — slow decolorisation of bromine in sunlight; alkane series structural formula
  • Metal flow chart analysis (Metal M + HCl, ammonia, NaOH) — metal identification, gas identification, equation writing
  • Indicators distinguishing HCl from NaCl; solubility definition and calculation from experimental data
  • Reduction of lead (II) oxide by hydrogen — grey solid identification, equations
  • Catalytic decomposition of hydrogen peroxide — lab diagram; mass of H₂O₂ for 120 cm³ O₂
  • pH values and solution identification; compound formula from aqueous ammonia and copper(II) sulphate
  • Preparation of sodium sulphate crystals from sodium hydroxide
  • Latent heat and enthalpy change — melting and dissolution processes
  • Bond energy calculation — enthalpy change for formation of HCl from H₂ and Cl₂
  • Iodine sublimation — bond type, formula of purple vapour, uses of iodine
  • Magnesium burning in CO₂ — explanation and equation
  • Graham's Law of diffusion — statement and calculation (O₂ vs. SO₂ diffusion time)
  • Catalytic oxidation of ammonia — hot platinum wire observation
  • Water hardness — temporary and permanent; removal methods
  • Double decomposition (silver nitrate + barium chloride); ionic equation
  • Carbon monoxide as a silent killer
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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