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Summary

  • Description:

    The MS Word document contains the Form 4 Chemistry Mid Term 2 Exam 2025 with Marking Scheme. A PDF version is also available upon request.

    Please note: The marking scheme is provided in a separate document.

    The exam paper, titled “CHEMISTRY FORM 4 MID TERM 2 2025 EXAMINATION,” consists of 10 questions and is marked out of 50 marks.

    Topics Covered in the Exam:

    1. Chemical Equilibrium

    • Definition of dynamic equilibrium

    • Stating Le Chatelier’s Principle

    • Explaining the effect of increased temperature on the yield of nitrogen(II) oxide in the reaction:
      N₂(g) + O₂(g) ⇌ 2NO(g) + heat

    • Calculating the volume of nitrogen(II) oxide produced from a given volume of nitrogen

    • Predicting the position of equilibrium when pressure is reduced

    2. Gases

    • Stating Graham’s Law of Diffusion

    • Calculating the time required for a gas (Y) to diffuse, given the diffusion time and relative molecular mass (RMM) of another gas (X) under the same conditions

    3. Chemical Energetics (Thermochemistry)

    • Definition of bond energies

    • Calculating the enthalpy change for the reaction:
      C₂H₄(g) + Br₂(g) → C₂H₄Br₂(g) using provided bond energies and identifying the type of reaction

    • Definition of molar heat of solution

    • Writing a thermochemical equation for the dissolution of sulphuric(VI) acid (H₂SO₄)

    • Calculating the temperature rise (ΔT) when a given mass of H₂SO₄ is dissolved in water, using the provided density and specific heat capacity

    4. Water

    • Definition of hard water

    • Stating two methods for removing permanent hardness in water

    5. The Mole Concept and Stoichiometry

    • Writing the balanced equation for the reaction between hydrochloric acid and calcium hydrogen carbonate

    • Calculating the moles of HCl used and the corresponding moles of calcium hydrogen carbonate

    6. Atomic Structure and the Periodic Table

    • Determining the number of neutrons in an element (Y) based on its atomic and mass numbers

    • Drawing the ionic structure of element Y

    • Analyzing a periodic table grid:

      • Identifying the position of an element (M) with atomic number 1 and discussing possible placements

      • Naming the family groups for specific elements (e.g., G and T; K and H)

      • Selecting the lightest noble gas from given options

      • Comparing the reactivity of elements H and K, with justification

      • Comparing the atomic radii of elements G and X, with explanation

      • Writing the formula of a compound formed between element Q (same group as P) and oxygen

    7. Metals

    • Stating two methods to prevent rusting of a metallic spatula

    8. Non-Metals (Oxygen)

    • Writing the formula of the chemical used in the laboratory preparation of oxygen gas

    • Stating two commercial uses of oxygen

  • File Size:
    32.21 KB
  • Length:
    5 pages
  • Category:
    Exams
  • Level:
    Form 4
  • Subject:
    CHEMISTRY
  • Posted By:
    Caleb_Peter

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