Summary

• Description:

  The MS Word document comprises Nakuru North Joint Evaluation Chemistry Paper 2 2025 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It is a KCSE Chemistry (Theory) Paper 2 (233/2) Nakuru North Joint Evaluation Mock 2025 examination (End Term 2, June/July 2025).

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 6 (Questions 1–6)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Periodicity and bonding: oxide structures (giant ionic vs covalent), melting point comparison, acidic/basic nature of oxides, electron affinity and halogen family trends
  • Gas preparation and collection: collecting hydrogen gas produced from calcium and water
  • Organic chemistry: structures/naming of alkenes and alkanes, reaction pathways and identification of reagents/conditions, conversion of long-chain alkanoic acids to detergents and scum formation in hard water
  • Industrial chemistry: manufacture of ammonia (Haber process), role of impurity removal and optimum conditions, uses of ammonia, manufacture of urea and percentage nitrogen comparisons
  • Qualitative analysis: reactions of aqueous ammonia with copper(II) ions (observations in drops and in excess)
  • Equilibrium: Le Chatelier’s principle and effect of adding alkali to a bromine-water equilibrium system
  • Rates of reaction: sodium thiosulphate reaction (temperature effect and other factors), and graph work from gas evolution data including rate determination
  • Electrochemistry: standard reduction potentials, identifying reducing agents, corrosion/displacement reasoning (silver nitrate and lead), electrochemical cell setup, cell notation and E° calculations
  • Electrolysis and Faraday’s laws: electrolysis of aqueous copper(II) sulphate using copper electrodes and mass change calculation
  • Separation techniques: fractional crystallization and solubility-based crystallization calculations
  • Water hardness: ion-exchange resin method, disadvantages of hard water, and effect of ammonia on water containing magnesium ions
  • Extraction of copper: ore concentration, roasting and slag formation equations, identification of substances/processes, uses of copper, and environmental effects
  • Radioactivity: identifying emitted particles in decay stages, characteristics and dangers of radiation, uses of radioisotopes, and half-life mass calculations
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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