Summary

• Description:

  The PDF document comprises Kabras West Sub County Chemistry Paper 3 2026 Joint Exam with Marking Scheme. The marking scheme is in a different document.

  It was a Form 4 chemistry practical joint examination assessing volumetric analysis titrations, reaction rates kinetics, and qualitative inorganic/organic identification routines. It is a critical revision asset for students preparing for practical chemistry papers.

  • Month Administered: July 2026
  • Duration: 2 ¼ Hours
  • Total Marks: 40
  • Number of Questions: 3

  It covers the following topics:

  • Question 1: Volumetric Analysis (Quantitative Titration)
    • Standardization of sodium hydroxide solution ($\text{NaOH}$)
    • Acid-base titration using phenolphthalein indicator to determine the relative formula mass ($M_r$) and unknown element $Y$ in dibasic acid $\text{H}_2\text{Y}$
  • Question 2: Chemical Kinetics (Rates of Reaction)
    • Investigating temperature dependency on the rate of redox reaction between acidified potassium manganate (VII) ($\text{KMnO}_4$) and dibasic acid $\text{H}_2\text{Y}$
    • Data collection, graph plotting ($1/t$ against temperature), and rate extrapolation
  • Question 3: Qualitative Analysis
    • Inorganic salt testing: Cation and anion analysis using aqueous ammonia, flame tests, barium nitrate, and acidified potassium manganate (VII) to test for sulphites/sulphates
    • Organic compound testing: Flame burn tests, solubility, pH evaluation, and testing for degree of unsaturation using acidified $\text{KMnO}_4$ and $\text{K}_2\text{Cr}_2\text{O}_7$
• File Size:

  804.82 KB
• Length:

  11 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

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