Summary

• Description:

  The MS Word document comprises Starehe Girls’ Centre Chemistry Paper 3 2025 Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  The exam paper is a Chemistry practical paper consisting of three compulsory questions. It is marked out of a total of 40 marks and should be completed by learners within a duration of 2¼ hours, with the first 15 minutes allocated for checking apparatus and chemicals.

  The paper is intended for Form 4 learners and assesses practical skills in volumetric analysis, rate of reaction investigations, qualitative analysis, and interpretation of experimental results in line with the KCSE Chemistry practical syllabus.

  It covers the following practical areas:

  • Volumetric analysis using acid-base titration
  • Preparation and dilution of standard solutions
  • Determination of concentration and relative atomic mass from titration data
  • Effect of concentration on rate of reaction (sodium thiosulphate and hydrochloric acid)
  • Timing reactions and plotting graphs for rate interpretation
  • Qualitative analysis of salts using reagents and observation tables
  • Flame tests and identification of ions
  • Use of oxidizing agents and precipitation tests in analysis
  • Recording observations, making inferences, and drawing conclusions

  Candidates are required to demonstrate accurate measurements, proper titration technique, correct recording of results, clear graph plotting, careful observations, logical inferences, and adherence to laboratory safety and procedure.

• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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