Summary

• Description:

  The MS Word document comprises Form 2 Chemistry Mid Term 2 Exam 2025 with Marking Scheme. The PDF version is also available upon your request.

  The marking scheme is in a different document.

  The exam paper, titled "FORM TWO CHEMISTRY MID TERM 2 2025 EXAMINATION" in the document, consists of 10 main question blocks (though numbering is inconsistent in the source document) and is marked out of a total of 50 marks. All questions are to be answered within a duration of 1 hour and 30 minutes.

  The topics covered in the exam include:

  • Atomic Structure and The Periodic Table:
    • Writing electronic configuration of ions.
    • Determining the formula of oxides based on element position/valency.
    • Analyzing trends in atomic and ionic radii and relating them to metallic/non-metallic character and reactivity.
    • Defining isotopes and calculating relative atomic mass from isotopic abundance.
    • Explaining the trend in atomic radii across a period (e.g., Period 3).
    • Interpreting a blank periodic table grid to:
      • Identify the group of given elements and explain.
      • Determine the most reactive element within a group and explain.
      • Write the formula for an ion of a given element.
      • Select an element with specific properties (e.g., stored under water).
      • Compare ionic radii of elements.
      • Select the most reactive non-metal and explain.
      • Identify an element that does not form compounds (noble gas).
      • Identify transition metals (region X) and state uses of specific noble gases (e.g., Helium in weather balloons).
  • Chemical Bonding:
    • Defining an electrovalent (ionic) bond.
    • Using dot and cross diagrams to show ionic bond formation (e.g., in Magnesium Oxide).
  • Metals:
    • Explaining why metals like magnesium and aluminium are good conductors of electricity.
    • Giving reasons for the use of aluminium in electric cables over magnesium (other than cost).
  • Air, Oxygen, and Hydrogen:
    • Understanding the fractional distillation of air (identifying substances removed at filtration, reasons for removing CO₂ and water, component collected at a specific temperature).
    • Completing a diagram for the laboratory preparation of oxygen gas (e.g., from sodium peroxide and water).
    • Naming reactants and writing a balanced chemical equation for the preparation of oxygen.
    • Understanding an experimental setup to investigate the properties of hydrogen gas (e.g., as a reducing agent with copper (II) oxide), including necessary conditions, safety precautions, and observations.
    • Writing the chemical equation for the reaction of hydrogen with copper (II) oxide.
    • Identifying the property of hydrogen being investigated.
    • Explaining why certain oxides (e.g., Zinc oxide) might not be suitable for demonstrating this property.
  • Acids, Bases and Salts (pH):
    • Identifying solutions as acidic, alkaline, or neutral based on pH values (e.g., identifying NaOH, H₂SO₄, MgCl₂ from given pHs).
• File Size:

  198.49 KB
• Length:

  6 pages
• Category:

  Exams
• Level:

  Form 2
• Subject:

  CHEMISTRY
• Posted By:

  Caleb_Peter

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