Kinetic theory and every gas law with worked numbers, what vapour pressure and surface tension really measure, and the unit-cell arithmetic that gives a metal its density.
Unit 1 carries 17 of the 50 chemistry marks; with fourteen chapters sharing them, this one averages a little over one (MEC publishes weights by unit, not by chapter). It is one of the two or three largest chapters in the whole Chemistry syllabus, and the only one that mixes a numerical zone (the gas laws, the unit cell) with a pure-recall zone (hydrates, solubility, crystal systems).
The MEC scope line runs: Gases: kinetic theory of gases, gas laws, ideal and combined gas equations, deviation of real gases from ideal behaviour. Liquids: vapour pressure, boiling point, surface tension, viscosity, liquid crystals, solution, solubility and solubility curves. Solids: crystalline and amorphous solids, efflorescence, deliquescence and hygroscopic solids, crystallisation and water of crystallisation, crystal growth, unit cell, the seven crystal systems and fourteen Bravais lattices, classification of solids on the basis of the dominant bond. The three headings below are its three points.
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See the plansMole Concept & Stoichiometry Made Simple
Avogadro's number, molar mass, molarity and the calculations that show up every year.
Basic Concepts in Chemistry: Masses, Radicals and Formulae
The vocabulary every other chemistry chapter assumes: valency, the carbon-12 mass scale, the radical charges you must know cold, and the two routines that turn a percentage into a formula.
Stoichiometry: The Mole, the Limiting Reagent and Ten Numericals
Dalton's postulates and where they fail, the five laws of combination, Avogadro's law and its uses, and every mole calculation the paper can ask, worked step by step.
Atomic Structure: From Bohr's Orbit to the Quantum Orbital
Rutherford's nucleus and why it could not survive, Bohr's three formulae, the hydrogen spectrum, de Broglie and Heisenberg, and the four quantum numbers that build every configuration.