Summary

• Description:

  The PDF document comprises KALA Joint Trials Chemistry Paper 2 2025 Mock Exam with Marking Scheme.

  It is a KCSE Chemistry (Theory) Paper 2 (233/2) KALA Trial Exam 2025 examination.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 7 (Questions 1–7)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Periodic table trends and bonding (families, ions, ionic vs atomic radius, melting point comparisons, dot-and-cross diagrams)
  • Solubility curves and calculations (graph plotting, reading values, crystallisation, molar concentration from solubility data)
  • Acidity of salt solutions (e.g., aluminium chloride solution)
  • Energetics and thermochemistry (bond energy calculations, temperature change from reaction enthalpy, cooling curve sketch, standard heat of formation, Hess’s law/energy cycles)
  • Electrochemistry (standard electrode potentials, identifying oxidising agents, cell emf, cell diagram and electron flow)
  • Electrolysis calculations (copper(II) sulphate using copper electrodes; anode reaction and mass change using Faraday’s law)
  • Organic chemistry (functional group identification, reactions with bromine water and magnesium, polymerisation, esterification, soap structure and effectiveness)
  • Industrial and inorganic processes (manufacture of hydrogen chloride gas, chlorine reactions, hydrogen sulphide/chlorine reaction energetics, equilibrium yield factors, rate factors)
  • Extraction of aluminium (electrolytic cell set-up, ore concentration, electrode reactions, operating temperature, tests for aluminium ions, properties of duralumin, pollution effects)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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