OSN Coaching Chemistry SMA

Structure & bonding (IChO reference): Nucleons, isotopes, radioactive decay & nuclear reactions; Quantum numbers, orbitals, Hund's rule, Pauli principle, electron configuration; Periodic table & trends; Bond types, intermolecular forces, Lewis theory, VSEPR. Physical chemistry: Stoichiometry, the mole, concentration; Equilibrium, Le Chatelier, acids & bases, pH, buffers, hydrolysis, Ksp; Electrochemistry: Nernst, electrolysis, Faraday's laws; Kinetics: rates, reaction order, Arrhenius, catalysts, half-life; Thermodynamics: enthalpy, Hess's law, Born-Haber, entropy, Gibbs energy, ideal gases. Analytical & inorganic chemistry: Acid-base, redox (permanganometry, iodometry), complexometric and precipitation titrations; Qualitative analysis & flame tests, Beer-Lambert law; s- and p-block elements, C/N/S oxides, oxoacids, first-row transition metals. Organic chemistry: Nomenclature, hybridisation, resonance, aromaticity; Isomerism & stereochemistry (E/Z, R/S, Fischer/Newman/Haworth projections); Addition, substitution (SN1/SN2, electrophilic aromatic), elimination (E1/E2), radical reactions; Functional-group redox, Grignard, Fehling, Tollens reactions; simple polymers

OSN-S (School) (January – February 2026): Selection at each school; schools register up to 5 students per field.. OSN-K (District/City) (18–19 June 2026): 50 multiple-choice questions, 1 hours 40 minutes. OSN-P (Province) (27–29 July 2026): 8–10 multiple-choice questions & structured answer, 2 hours. National Semifinal (12 August 2026): 5 essay questions, 2 hours. National Final (14–20 September 2026 (in person)): Day 1: practical 3 set · Day 2: 10 theory essays, 4 hours per day.

Senior High students who want to take part in the OSN Chemistry field, whether beginners or returning participants.

Yes. OSN Chemistry SMA training at Presisi Academy runs online with live classes, graded practice, and selection simulations. In-person classes are coming soon.