Summary

• Description:

  The PDF document comprises BRISTAR JOINT Chemistry Paper 1 2026 Mock Exam with Answers (Marking Scheme). The marking scheme is in a different document.

  It was a KCSE Chemistry 233/1 examination.

  This paper tests broad competencies in fundamental chemical concepts, organic nomenclature, gas laws, chemical bonding, stoichiometry, equilibria, thermochemistry, and qualitative analysis.

  • Month Administered: July, 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 29 (Questions 1 – 29)
  • Structure: Single compulsory theory paper containing 29 structured, computational, and descriptive questions.

  It covers the following topics:

  • Organic Chemistry (isomerism and IUPAC naming of pentane, combustion analysis and empirical formulas, catalytic cracking of long-chain hydrocarbons)
  • Atomic Structure, Isotopes, and Radioactivity (relative atomic mass calculation of neon isotopes, radioactive half-life decay kinetics)
  • Chemical Reactions and Bonding (amphoteric hydroxides, reactions of alkali metals with water, dot-and-cross bonding diagrams for ionic and covalent compounds)
  • Water and Solubility (hard vs soft water advantages, qualitative/quantitative solubility determination and calculation)
  • Gas Laws and Reacting Masses (combined gas law calculations, stoichiometry of aluminium reacting with oxygen)
  • Qualitative Analysis (cation identification using aqueous ammonia, physical and chemical identification tests for water)
  • Chemical Equilibria and Industrial Chemistry (Contact Process catalysts and Le Chatelier's principle, chlorine bleaching agents, Hall-Héroult aluminium extraction, nitrogen uses)
  • Salt Preparation and Solution Chemistry (preparation of pure zinc carbonate, displacement reactions of iron and copper(II) sulfate)
  • Acids, Bases, and Reaction Rates (rates of monobasic acids reacting with magnesium, pH identification and metal reactivity)
  • Thermochemistry and Electrochemistry (molar heat of vaporization of hydrogen peroxide, electrolysis of magnesium sulphate solution, electrochemical cell e.m.f and standard reduction potentials, atmospheric corrosion and rusting prevention)
  • Separation Techniques (principles and factors influencing paper chromatography)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

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