Summary

• Description:

  The PDF document comprises the Chemistry Paper 3 (Practical) Maseno School Mock Exam as a KCSE Trial Exam, administered in July/August 2024. The marking scheme is in a different document.

  This practical paper consists of three compulsory questions to be completed in a duration of 2 hours and 15 minutes. The examination is marked out of a total of 40 marks and is designed to test a candidate's skills in quantitative analysis (thermochemistry and titration), and qualitative analysis (both inorganic and organic).

  The paper includes the following experiments:

  • 1. Quantitative Analysis (Thermochemistry and Titration): This is a two-part experiment. In the first part, candidates measure the temperature change of a reaction between a solid (A) and hydrochloric acid, requiring them to plot a graph to determine the precise change in temperature. In the second part, they perform a back-titration on the resulting solution to determine the amount of unreacted acid, which allows for the calculation of the enthalpy change of the initial reaction.
  • 2. Inorganic Qualitative Analysis: This question requires the systematic identification of ions in an unknown solid mixture (E). The procedure involves separating the mixture into soluble and insoluble components, followed by a series of chemical tests on the residue and the filtrate to identify the cations and anions present. Candidates must record their observations and make logical inferences.
  • 3. Organic Qualitative Analysis: This question involves carrying out tests on an unknown organic solid (F) to identify its functional group. The tests include reacting the substance with a base, an oxidizing agent (acidified potassium manganate (VII)), sodium hydrogen carbonate, and determining its pH, which are characteristic tests for an organic acid.
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY

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