Summary

• Description:

  The PDF document comprises Bungoma South Cluster Chemistry Paper 1 2026 Pre-Mock Exam with Answers (Marking Scheme). The marking scheme is in a different document.

  It was a KCSE Form 4 Chemistry Paper 1 examination.

  This exam assesses core concepts across inorganic, physical, and organic chemistry through concise, calculation-heavy, and theoretical structured questions. It tests learners on periodic trends, industrial processes, reaction kinetics, and chemical equations.

  • Month Administered: July 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 28 Questions (Questions 1 – 28 compulsory)
  • Structure: Single compulsory structured question paper testing the breadth of the KCSE Chemistry syllabus.

  It covers the following topics:

  • Separation of mixtures using fractional solubility in polar and non-polar solvents
  • Periodic table trends: reactivity of non-metals, ionic radii, and compound formulation
  • Metallurgy: blast furnace extraction of iron, raw materials, reduction equations, and uses
  • Organic chemistry: dehydration of alcohols, isomerism in alkenes, combustion, and addition polymerisation (polystyrene)
  • Gas laws: Graham's law of diffusion calculations and molecular mass determination
  • Structure and bonding: hydrogen bonding in water and dative covalent bonding in phosphonium ions
  • Qualitative analysis: reaction of copper(II) ions with aqueous ammonia and complex ion formation
  • Industrial chemistry: large-scale manufacture of hydrochloric acid
  • Electrochemistry: electrical conductivity in molten vs. solid electrolytes
  • Gas laws: experimental verification of Charles's law
  • Industrial extraction of oxygen through fractional distillation of air
  • Saponification: soap manufacturing process and salting out using sodium chloride
  • Acids, bases, and salts: pH scale interpretation and reactivity with hydrogen carbonates
  • Reactions of magnesium in air, nitride formation, and hydrolysis to ammonia
  • Physical chemistry: experimental determination of solute solubility at specific temperatures
  • Radioactivity: half-life calculations and radioisotope decay
  • Chemical equilibria: Le Chatelier's principle in chromate-dichromate equilibrium
  • Thermochemistry: calculating molar heat of displacement of copper by zinc
  • Redox reactions: determining oxidation numbers of nitrogen
  • Periodic trends: ionization energy variation in group elements
  • Reduction of copper(II) oxide using dry hydrogen gas and industrial uses of hydrogen
  • Cation and anion qualitative identification tests in aqueous solutions
  • Hydrocarbons: empirical and molecular formula determinations of alkynes
  • Carbon allotropes: structural comparison and electrical conductivity of graphite
  • Water hardness: boiler scale formation, removal, and advantages of hard water
  • Paper chromatography: identifying dye components and base line interpretation
  • Electrochemistry: standard reduction potentials, cell representation, and standard EMF calculation
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

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