Armenia Chemistry Unified Exam study guide
Armenia Chemistry Unified Exam · Work through your exam, one topic at a time.
The Chemistry Unified Exam is the standardized chemistry entrance assessment used in Armenia for applicants to university chemistry, pharmacy, medicine, biology and related science programs. It is intended for secondary-school graduates and other candidates who need a formal chemistry score for admission, and it assumes a completed school course in general, inorganic and organic chemistry. The Armenia Chemistry Unified Exam study guide has 10 sections and about 2,581 words.
01Atomic Structure and the Periodic Law
Candidates should be fluent with the nuclear model: protons and neutrons in the nucleus, electrons in orbitals described by the quantum numbers n, l, m and spin. Know the order of filling (Aufbau), the n+l rule, Hund's rule and the Pauli exclusion principle, and be able to write electron configurations including the anomalous cases Cr and Cu.
244 words, about 1 min02Chemical Bonding and Structure of Matter
Distinguish ionic, covalent (polar and non-polar), metallic and intermolecular bonding. Use electronegativity difference to judge bond polarity and predict molecular shape with VSEPR (linear, trigonal planar, tetrahedral, trigonal pyramidal, bent).
239 words, about 1 min03Inorganic Chemistry: Periodic Trends and Main-Group Elements
Master the trends - atomic radius, ionisation energy, electron affinity, electronegativity, metallic character - and their anomalies. Know the chemistry of the main groups: alkali and alkaline-earth metals (reactivity with water, oxides, hydroxides), group 13–14 elements (amphoteric behaviour of Al and its oxide), group 15–16 (nitrogen fixation, ammonia, nitric and sulfuric acid industrial routes, SO₂ as a reducing agent), and the halogens and noble gases (displacement reactions, oxidising power falling down the group).
246 words, about 1 min04Transition Metals and Coordination Compounds
Transition metals show variable oxidation states, form coloured ions, act as catalysts and form complex ions. Know ligand types (monodentate, bidentate, polydentate such as EDTA), coordination number, and the naming and formula conventions of complexes.
224 words, about 1 min05Stoichiometry and the Mole Concept
Be confident converting between mass, moles, particles and gas volume (molar volume at STP). Balance equations and use mole ratios to find limiting reagents, theoretical and percentage yield, and empirical versus molecular formulae.
220 words, about 1 min06Chemical Kinetics
Understand rate as change in concentration over time, and the factors affecting it: concentration, temperature, surface area, pressure, catalysts. Know collision theory - effective collisions require sufficient energy and correct orientation.
218 words, about 1 min07Thermodynamics and Equilibrium
Distinguish exothermic and endothermic processes, and understand enthalpy, entropy and Gibbs free energy: ΔG = ΔH − TΔS. Know that ΔG < 0 indicates spontaneity.
207 words, about 1 min08Solutions
Understand solution formation, solubility rules, concentration units (molarity, mass percent, molality), dilution and mixing. Know factors affecting solubility: temperature, pressure (Henry's law for gases), and the like-dissolves-like principle.
197 words, under 1 min09Electrolytes, Acids, Bases and Salts
Apply Brønsted–Lowry and Lewis definitions. Know strong versus weak acids and bases, and the meaning of Ka, Kb, Kw and pH.
210 words, about 1 min10Electrochemistry and Redox Reactions
Identify oxidation (loss of electrons, increase in oxidation number) and reduction (gain). Balance redox equations by half-reaction and oxidation-number methods.
576 words, about 3 min