Summary

• Description:

  The MS Word document comprises MOKASA I Joint Examination 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.

  It is a KCSE Chemistry Paper 1 (233/1) examination.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 29 (Questions 1–29)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Acids, Bases, and Indicators (Commercial indicators, neutralization, and pH values)
  • Separation Techniques (Separation of iodine and sodium chloride mixtures)
  • Carbon and its Compounds (Chemical properties of Carbon(II) Oxide and amphoteric oxides)
  • Preparation of Gases (Oxygen using manganese(IV) oxide; Chlorine using concentrated sulphuric(VI) acid; Hydrogen gas preparation)
  • Organic Chemistry (Isomerism in hydrocarbons and distinguishing alkanes from alkenes)
  • Gas Laws (Boyle’s Law calculations)
  • Stoichiometry (Calculating molecular formulas and molar gas volumes)
  • Electrochemistry (Electrolysis of molten magnesium chloride)
  • Atomic Structure and Bonding (Isotopes, electron arrangement, and dot-and-cross diagrams for sodium chloride)
  • Radioactivity (Identification of radioactive emissions)
  • Thermochemistry (Calculating enthalpy of formation from combustion data)
  • Non-Metals and their Compounds (Allotropes of sulphur and reactions with nitric acid)
  • Qualitative Analysis (Identification of cations and anions in solids)
  • Environmental Chemistry (Effects of Nitrogen(IV) oxide exposure)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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