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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) + heatCalculating 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 reactionDefinition 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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