Summary

• Description:

  The MS Word document comprises the Form 3 Chemistry Paper 3 (Practical) End Term 3 2025 Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  The practical exam paper is designed to be completed within a duration of 2 hours and 15 minutes and is marked out of a total of 40 marks. It consists of 3 compulsory questions that test a range of quantitative and qualitative analytical skills.

  The examination covers the following practical areas:

  • Question 1: Quantitative Analysis - Back Titration (14 marks)
    • This experiment involves determining the percentage purity of impure sodium carbonate.
    • Skills tested include solution preparation, dilution, acid-base titration using an indicator, and performing multi-step stoichiometric calculations.
  • Question 2: Quantitative Analysis - Redox Titration (15 marks)
    • This experiment requires the standardization of an acidified potassium manganate(VII) solution using a standard solution of ammonium iron(II) sulphate.
    • Skills tested include redox titration, preparation of a standard solution, and stoichiometric calculations based on a given ionic equation.
  • Question 3: Qualitative Analysis (11 marks)
    • This question involves the systematic identification of cations and anions present in an unknown solid mixture.
    • Skills tested include separation techniques (dissolving and filtration) and carrying out a series of chemical tests to identify unknown ions based on observations and inferences.
• Category:

  Exams
• Level:

  Form 3
• Subject:

  CHEMISTRY

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