Summary

• Description:

  The MS Word document comprises RCEA JOINT Chemistry Paper 3 2026 Mock Exam with Answers (Marking Scheme). The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 3 practical mock examination focusing on quantitative thermochemical titration, solubility curve determination, and systematic qualitative inorganic and organic analysis. It tests skills in measuring temperature changes, graphical analysis, and identifying unknown ions and organic functional groups.

  • Duration: 2 Hours 15 Minutes
  • Total Marks: 40
  • Number of Questions: 3 (Questions 1 - 3)
  • Structure: Question 1 (15 marks, thermochemistry and back titration), Question 2 (7 marks, solubility and crystallization graph), and Question 3 (18 marks, qualitative inorganic and organic analysis).

  It covers the following topics:

  • Thermochemistry and back titration: temperature-time cooling curve determination for the molar enthalpy of reaction between a solid metal/base and hydrochloric acid, followed by neutralizing unreacted acid with standard sodium hydroxide
  • Physical chemistry (solubility): solubility determination of a salt across varying temperatures, crystallization points, and solubility curve plotting
  • Inorganic qualitative analysis: systematic ionic testing for cations and anions using aqueous sodium hydroxide, aqueous ammonia, barium nitrate, dilute nitric(V) acid, and the Devarda's alloy/reduction test for nitrate ions
  • Organic qualitative analysis: testing for unsaturation and functional groups using ignition on a non-luminous flame, bromine water, sodium carbonate effervescence, and acidified potassium dichromate(VI) oxidation
• File Size:

  29.63 KB
• Length:

  7 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Chemistry
• Posted By:

  Caleb_Peter

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