Summary

• Description:

  The PDF document comprises KALA Joint Trials 2024 Chemistry Paper 3 Exam with Answers and Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 3 (233/3) Practical examination administered in July 2024.

  • Duration: 2 Hours 15 Minutes
  • Total Marks: 40
  • Number of Questions: 3
  • Instructions: Candidates were required to answer all questions and were given the first 15 minutes to read the paper and confirm the availability of apparatus and chemicals before starting the practical work.

  The paper consisted of practical investigations, laboratory experiments, qualitative analysis, and interpretation of experimental observations.

  It covered the following topics:

  • Determination of solubility of a solid substance in water using temperature-time data
  • Graph plotting and interpretation of temperature against time to determine dissolution temperature
  • Calculation of solubility in grams per 100 grams of water
  • Preparation of a standard solution using a volumetric flask
  • Acid–base titration using hydrochloric acid and methyl orange indicator
  • Calculation of average titre values and concentration of a solution
  • Determination of number of moles in acid–base reactions
  • Determination of concentration of a solution in moles per litre and grams per litre
  • Calculation of the relative formula mass of an unknown substance
  • Qualitative analysis of a solution containing two cations and one anion
  • Use of sodium hydroxide, nitric acid, hydrochloric acid, ammonia solution, and barium chloride in identification of ions
  • Observation and inference techniques in qualitative analysis
  • Identification of unknown organic liquids through combustion and chemical reactions
  • Solubility tests of organic liquids in water
  • Reaction of organic compounds with sodium hydrogen carbonate
  • Oxidation reactions using acidified potassium dichromate
  • Functional group tests for organic compounds
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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