Summary

• Description:

  The MS Word document comprises Mangu High School Chemistry Paper 3 2026 Mock Exam with Answers (Marking Scheme). The PDF version is also available upon your request. The marking scheme is towards the end of the file.

  It was a Mangu High School Endterm 2 Chemistry Paper 3 practical examination marking scheme.

  This practical guide outlines detailed procedures, observational indicators, and marking rubrics for secondary chemistry practical assessments, focusing on redox titrations, reaction kinetics, and qualitative inorganic and organic analysis.

  • Structure: Section 1 covering redox titration, Section 2 covering reaction kinetics and concentration effects, and Qualitative Analysis covering systematic cation, anion, and functional group tests.

  It covers the following topics:

  • Quantitative Analysis (Redox Titration):
    • Titration of potassium iodate(V) and acidified potassium iodide against sodium thiosulphate using starch indicator
    • Stoichiometric calculations of reacting moles, molarity, and redox ionic reactions
  • Chemical Kinetics (Reaction Rates):
    • Investigation of the effect of hydrogen peroxide concentration on the rate of reaction with acidified potassium iodide
    • Measurement of reaction time, determination of reciprocal rate values (1/t), graphing, and collision theory dynamics
  • Qualitative Analysis:
    • Inorganic salt analysis of Solid D1: aqueous solubility, precipitation reactions using aqueous sodium hydroxide and aqueous ammonia for zinc ion identification, sulfate anion tests with barium nitrate, and nitrate reduction tests using Devarda's alloy / aluminium foil
    • Organic compound analysis of Solid M1: flame test for unsaturation (yellow sooty flame), halogen addition with bromine water, carbonate effervescence testing for carboxylic groups, and oxidation tests using acidified potassium dichromate(VI)
• File Size:

  96.15 KB
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Chemistry
• Posted By:

  Caleb_Peter

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