Summary

• Description:

  The PDF document comprises Navakholo Joint Evaluation Test 1 Chemistry Paper 2 March 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Chemistry Paper 2 examination. This paper tests deeper analytical and computational chemistry skills through 7 structured questions covering the periodic table, electrochemistry, organic chemistry, thermochemistry, and qualitative analysis.

  • Month Administered: March 2026
  • Duration: 2 hours
  • Total Marks: 80
  • Number of Questions: 7 (Questions 1–7)
  • Structure: All questions compulsory; KNEC mathematical tables and calculators permitted

  It covers the following topics:

  • Period three elements — atomic radii table, melting points (Na, Mg, Cl, Ar), bonding and structure explanations, electrical conductivity, dot-cross diagrams, ionisation energy equations, oxide nature trend
  • Reaction of ammonia with copper(II) oxide — gas identification, equations, mass calculations (liquid Z and copper(II) oxide); trona from Lake Magadi — extraction of sodium carbonate and sodium chloride
  • Energy profile of 2H₂ + O₂ → 2H₂O; catalysed vs. uncatalysed reaction curve; bond energy calculation for N₂H₄ decomposition; molar enthalpy of ammonium chloride dissolution; Hess's Law (SO₃ decomposition)
  • Organic chemistry flow chart — soda lime composition, conditions for chlorination/polymerisation/addition reactions, naming and drawing organic compounds B and F, industrial application, compound J (polythene) and its ban
  • Fractional crystallisation — solubility curves (salts A, B, C) plotted on same axes; crystallisation temperature, molarity of potassium nitrate at 60°C
  • Empirical formula of magnesium oxide; qualitative analysis — ion identification (Al³⁺, CO₃²⁻), ionic equation, sulphur compounds flow chart, allotropes of sulphur (transition temperature, rhombic and monoclinic)
  • Gas classification (acids, bases, neutral: NO, CO₂, SO₂, NH₃); percentage of oxygen in air diagram; pH definitions and solution comparisons
• File Size:

  428.46 KB
• Length:

  14 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

Enter your details below to initiate a payment using MPESA.