Summary

• Description:

  The PDF document comprises KALA Joint Trials 2024 Chemistry Paper 1 Exam with Answers and Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 1 (233/1) Joint Trial examination administered in July 2024.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 26 (Questions 1–26)
  • Paper Structure: Two sections – Section A (Questions 1–16) and Section B (Questions 17–26).

  The paper consisted of structured questions involving chemical calculations, explanations of chemical principles, interpretation of experimental set-ups, and drawing of chemical structures.

  It covered the following topics:

  • Chemical bonding and dot-and-cross diagrams for covalent compounds
  • Comparison of boiling points based on intermolecular forces
  • Electrical conductivity of substances in different solvents
  • Extraction of metals and copper ores
  • Determination of metal content in compounds through laboratory methods
  • Acid–base equilibria and Bronsted–Lowry acid-base theory
  • Le Chatelier’s principle and effects of adding reagents to equilibrium systems
  • Hydrated salts and determination of water of crystallization
  • Hydrocarbons, addition reactions and polymer formation
  • Energy profile diagrams and activation energy
  • Gas laws including Boyle’s law and temperature-volume relationships
  • Hydrolysis of salts and acidity of solutions
  • Determination of pH of solutions
  • Electrolysis of brine using industrial electrolytic cells
  • Faraday’s laws and calculation of quantity of electricity during electrolysis
  • Radioactivity and nuclear decay equations
  • Electrolysis and conductivity of ionic substances in different states
  • Preparation and collection of oxygen gas in the laboratory
  • Ionization energies and periodic trends in Group II elements
  • Reactions involving nitrogen oxides and environmental pollution effects
  • Enthalpy changes including heats of fusion and vaporization
  • Allotropes of carbon and structural differences between diamond and graphite
  • Properties and uses of charcoal
  • Laboratory reactions producing gases and identification using indicators
  • Redox reactions and determination of oxidizing agents
  • Qualitative analysis of sulphate ions
  • Electrolysis products at anodes and cathodes
  • Detection of water vapour in air through laboratory experiments
  • Paper chromatography and separation of pigments
  • Combustion of organic compounds and calculation of enthalpy change using bond energies
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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