Summary

• Description:

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

  It was a KCSE Form 4 Chemistry Paper 1 theory examination.

  This paper tests broad competence across physical chemistry, inorganic synthesis, analytical separations, stoichiometry, electrochemistry, and organic reaction pathways.

  • Total Marks: 80 marks
  • Number of Questions: 28 questions (Questions 1 – 28)
  • Structure: Compulsory structured theory questions testing foundational concepts and laboratory techniques

  It covers the following topics:

  • Thermal decomposition and open-crucible mass alterations of copper metal and copper(II) nitrate
  • Graham's law of gaseous diffusion calculations
  • Substitution halogenation of propane and haloalkane structural isomerism
  • Industrial gases used in oxyacetylene welding
  • Atomic structure, mass numbers, isotopes, and subatomic particle calculations
  • Water of crystallization determination in hydrated copper(II) sulphate
  • pH scale interpretations, amphoteric dissolution of aluminium oxide, and acid-base neutralization
  • Bonding models: Comparative melting points of ionic lattices versus simple molecular compounds
  • Classification of solids: Metallic, covalent network, ionic, and covalent molecular solids
  • Laboratory gas collection methods: Downward delivery and upward delivery
  • Thermochemistry: Bond energy calculations and reaction enthalpy determination
  • Reactivity of aluminium with steam and the protective oxide passivation layer
  • Volumetric titration stoichiometry: Molarity of ethanoic acid in commercial vinegar
  • Combustion zones and redox reactions occurring in a domestic charcoal jiko
  • Separation of mixtures: Purification of copper(II) oxide contaminated with sodium chloride
  • Chemical kinetics: Effects of zinc particle size and acid concentration on gas evolution rates
  • Contact process: Catalytic oxidation of sulphur(IV) oxide to sulphur(VI) oxide
  • Halogen displacement: Redox reactions between chlorine water and potassium iodide
  • Coordinate bonding: Lewis electron structures and dative bonds in aluminium chloride dimer
  • Combustion chemistry: Burning of magnesium metal in atmospheric oxygen and nitrogen
  • Electrochemistry: Cell notation interpretation and electromotive force (EMF) calculations
  • Oxidizing action of concentrated nitric(V) acid on sulphur and nitrogen dioxide hazards
  • Lewis dot-and-cross structures for carbon(II) oxide and the ammonium ion
  • Qualitative analysis: Precipitation tests distinguishing copper(II) from iron(II) ions
  • Dehydrating action of concentrated sulphuric(VI) acid on sugar and hydrated copper(II) sulphate
  • Calorimetry: Molar heat of neutralization calculations for strong acid-strong base reactions
  • Laboratory separation techniques: Principles of gravity filtration
  • Redox chemistry: Oxidation number determination of sulphur in varied oxy-anions
• File Size:

  309.81 KB
• Length:

  11 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Chemistry
• Posted By:

  Caleb_Peter

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