Cambridge · O Level · Syllabus 5070
Chemistry
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Form 3 3 topics
- States of matter and experimental techniques Kinetic particle theory: arrangement, motion and energy of particles in solids, liquids and gases; changes of state (melting, boiling, evaporation, condensation, freezing, sublimation); diffusion – lighter gas molecules diffuse faster.
- Atoms, elements, compounds and bonding Protons, neutrons and electrons; proton number and nucleon number; isotopes; electronic configuration (2, 8, 8 …). Relative atomic mass as a weighted average of isotopes.
- Stoichiometry and the mole concept Balanced equations with state symbols; ionic equations (e.g. Ag⁺(aq) + Cl⁻(aq) → AgCl(s)).
Form 4 1 topicsExam year
Form 3 4 topics
- Chemical energetics and reactions Exothermic (ΔH negative) and endothermic (ΔH positive) reactions; reaction pathway diagrams with activation energy; bond breaking is endothermic and bond making exothermic.
- Acids, bases and salts Acids are proton (H⁺) donors; bases are proton acceptors. Alkalis release OH⁻ in solution. pH scale, universal indicator; strong and weak acids (degree of ionisation).
- The Periodic Table and metals Elements arranged by proton number; groups have the same number of outer electrons. Metallic character decreases across a period.
- Chemistry of the environment and organic chemistry Testing for water (anhydrous copper(II) sulfate, cobalt(II) chloride); water treatment (sedimentation, filtration, chlorination); air composition; pollutants (CO, SO₂, NOₓ, particulates, methane) and their sources and effects; catalytic converters; greenhouse effect and climate change; acid rain.