Summary

• Description:

  The PDF document comprises KALA Joint Trials Chemistry Paper 3 2025 Mock Exam with Marking Scheme.

  It is a KCSE Chemistry Practical Paper 3 (233/3) KALA Trial Examination (July 2025).

  • Duration: 2¼ Hours
  • Total Marks: 40
  • Number of Questions: 3 (Questions 1–3)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Solubility and crystallisation practical: preparing solutions, cooling curves, and plotting a solubility–temperature graph
  • Determination of solubility at a given temperature and interpreting solubility data from a plotted graph
  • Volumetric analysis (acid–base titration using phenolphthalein) to determine concentration
  • Calculations on hydrated compounds: finding the value of n in H₂C₂O₄.nH₂O
  • Qualitative analysis: planning and carrying out confirmatory tests for calcium carbonate using provided reagents
  • Systematic qualitative tests on an unknown solid (E) including reactions with acidified potassium manganate(VII), sodium hydrogen carbonate, and acidified potassium dichromate
  • Recording observations and making inferences from practical tests
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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