Summary

• Description:

  The MS Word document comprises Starehe Girls’ Centre Chemistry Paper 1 2025 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  The exam paper contains 25 structured questions and is marked out of a total of 80 marks. It should be completed by learners within a duration of 1 hour.

  The paper is intended for Form 4 learners and assesses understanding and application of core Chemistry concepts, calculations, and chemical reasoning in line with the KCSE Chemistry syllabus.

  It covers the following topics:

  • Gas laws, including Boyle’s law and gas calculations
  • Chemical reactions and equations, including reactions of magnesium and oxides of nitrogen
  • Uses and preparation of carbon(IV) oxide
  • Rusting and factors affecting corrosion
  • Solubility and solubility calculations
  • Electrical conductivity in ionic compounds
  • Polymers and polymerization
  • Bond energies and enthalpy changes
  • Dynamic equilibrium and Le Chatelier’s principle
  • Electrolysis and Faraday’s laws
  • Radioactivity and half-life calculations
  • Electrochemical cells and reduction potentials
  • Hydrocarbons, including ethyne and its preparation
  • Allotropes and reactions of sulphur
  • Chlorine compounds, including calcium hypochlorite
  • Organic chemistry, including preparation of esters
  • Chemical bonding, including dot-and-cross structures
  • Empirical formula determination from combustion data
  • Qualitative analysis involving precipitation reactions
  • Industrial manufacture of ammonia
  • Gas collection methods and density comparison
  • Isotopes and relative atomic mass calculations
  • Tests for purity of liquids
  • Diffusion and Graham’s law applications
  • Electronic configuration and periodic trends

  The questions are short-answer and calculation-based, requiring learners to demonstrate clear working, accurate chemical equations, correct interpretation of concepts, and sound reasoning.

• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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