Summary

• Description:

  The PDF document comprises Bungoma South Cluster Chemistry Paper 3 2026 Pre-Mock Exam with Answers (Marking Scheme). The marking scheme is in a different document.

  It was a KCSE Form 4 Chemistry Paper 3 examination.

  This practical examination evaluates experimental mastery in quantitative volumetric analysis, chemical kinetics, and qualitative identification of inorganic cations/anions and organic functional groups. It tests precise laboratory measurement, data tabulation, graphical analysis, and chemical inference.

  • Month Administered: July 2026
  • Duration: 2¼ Hours
  • Total Marks: 40 Marks
  • Number of Questions: 3 Questions (Questions 1 – 3 compulsory)
  • Structure: Three practical laboratory questions: Question 1 (12 marks), Question 2 (12 marks), and Question 3 (15 marks).

  It covers the following topics:

  • Question 1 (Quantitative Analysis):
    • Redox titration of acidified ethanedioate ions with standard potassium manganate(VII) solution
    • Stoichiometric mole calculations and determination of the solubility of sodium ethanedioate in grams per 100g of water
  • Question 2 (Reaction Kinetics):
    • Investigating the effect of concentration on reaction rate between sodium thiosulphate and dilute hydrochloric acid
    • Measurement of reaction time for sulfur precipitation, graphical plotting of concentration against reciprocal of time (1/t), and rate analysis
  • Question 3 (Qualitative Analysis):
    • Inorganic salt analysis: thermal decomposition, solubility testing, and confirmatory precipitation reactions using phenolphthalein, dilute HCl, aqueous sodium sulphate, and sodium hydroxide
    • Organic qualitative analysis: ignition characteristics, solubility tests, testing for carboxylic/acidic groups using sodium carbonate, and unsaturation tests using acidified potassium manganate(VII)
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

Enter your details below to initiate a payment using MPESA.