Summary

• Description:

  The MS Word document comprises Mumias West Sub-County Joint Evaluation Chemistry Paper 1 May 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 1 (Theory) examination. This paper tests candidates' conceptual and computational understanding of inorganic and organic chemistry, covering atomic structure, reaction kinetics, electrochemistry, and radioactivity through 27 structured questions.

  • Month Administered: May 2026
  • Duration: 2 hours
  • Total Marks: 80
  • Number of Questions: 27 (Questions 1–27)
  • Structure: All questions compulsory; answers written in spaces provided; calculators permitted

  It covers the following topics:

  • Laboratory apparatus for measuring exact volumes of liquids
  • Graham's Law of diffusion and molecular mass calculations
  • Preparation of Copper (II) Carbonate crystals from Copper (II) Oxide
  • Organic chemistry — isomers of butane; distinguishing ethane from ethene
  • Thermochemistry — enthalpy change using bond energies; molar enthalpy of formation
  • Preparation and collection of oxygen; decomposition of hydrogen peroxide
  • Self-raising flour — role of tartaric acid with sodium hydrogen carbonate
  • Radioactivity — half-life definition and percentage remaining after decay
  • Electrolysis of molten Copper (II) Chloride
  • Atomic structure — isotopes, number of neutrons, and element identification
  • pH values — identification of solutions and uses of acids
  • Dot and cross diagrams for ionic and covalent bonding
  • Collection of dry oxygen (diagram completion)
  • Importance of nitrogen in atmospheric air
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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