2026 Form 3 Chemistry Mid Term 2 Exam with Marking Scheme

This paper covers the following topics: Periodic table — electron arrangements, compound formulae, ionisation energy, atomic radius, and reactivity trends Noble gases — group identification and uses Ionic vs. covalent bonding in chlorides Solvay process — flowchart interpretation, raw materials, recycled substances, and reaction equations Carbon dioxide — uses as a fire extinguisher and laboratory preparation Graham’s law of diffusion — calculations comparing rates of diffusion of chlorine and hydrogen sulphide Charles’s law — table completion, graph plotting, extrapolation, and volume calculations Fractional distillation — apparatus identification and function (ethanol and water separation) Stoichiometry — mole calculations, percentage impurity in sodium carbonate, and carbon dioxide yield Avogadro’s law — statement and application to the reaction of sulphur dioxide and oxygen Number of Questions: 7 questions (Questions 1–7) Structure: All questions compulsory; answer all in spaces provided