Summary

• Description:

  The MS Word document comprises Muslim Schools Joint Evaluation Test (MUSJET) 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 K.C.S.E Chemistry Paper 1 (233/1) Mock Examination (July 2025).

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 27 (Questions 1–27)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Gas collection methods in the laboratory and choosing an appropriate method for specific gases
  • Thermal decomposition (e.g., heating lead(II) nitrate) and related stoichiometry calculations
  • Oxidation numbers and valency (interpreting formulae such as A₂O₃)
  • Acids and carbonates reactions (mole calculations to determine relative atomic mass)
  • Energetics: bond energies and estimation of reaction enthalpy
  • Sulphur(IV) oxide bleaching action and related chemical equations
  • Organic chemistry: naming/drawing structural formulae (alkenes and alkynes)
  • Gas laws (pressure–temperature–volume changes) and diffusion (Graham’s law)
  • Empirical/molecular formula determination from percentage composition
  • Electrolysis of aqueous salts (products at electrodes and electrode choice)
  • Chemical equilibrium and the Haber process (effects of pressure; catalyst; energy profile diagram)
  • Reactions producing soluble gases and reasons for failure to collect gas in a set-up
  • Electrochemical cells/electrolysis observations and electrode reactions from diagrams
  • Physical vs chemical changes (temporary chemical changes and examples)
  • Drug abuse and basic prescription interpretation
  • Bunsen burner flame structure and ignition behaviour in different regions
  • Gay-Lussac’s law and combustion volume calculations using air composition
  • Qualitative analysis/complex ions (reaction scheme leading to a complex ion in solution)
  • Isomerism (definition) and positional isomers of C₄H₈
  • Rusting (chemical name of rust), conditions affecting rusting, and protection by galvanising
  • Rates of reaction: interpreting experimental conditions and sketching comparative curves
  • Nuclear reactions: balancing nuclear equations to determine missing values
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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