Course · Chemistry
Chemistry.
What things are made of and how they change: atoms, bonds, reactions, acids and carbon, to high-school level.
The course, unit by unit
Units
12 units · 53 lessons · about 22 hours
Jump to a unit 12
Unit 1 · 7 lessons
Atoms and elements
Protons, neutrons and electrons, isotopes, electron shells, and how they lay out the periodic table and its families.
Unit 2 · 6 lessons
Bonding and structure
How atoms hold together: ionic, metallic and covalent bonds, lattices and crystals, and why structure decides how a substance behaves.
Unit 3 · 4 lessons
The mole
Counting atoms too small to see: formula mass, the mole and the Avogadro constant, and empirical formulas from measured masses.
Unit 4 · 4 lessons
Reactions and equations
Atoms are never made or lost: conservation of mass, balanced equations, reacting masses, the limiting reagent and the yield.
Unit 5 · 5 lessons
States of matter and gases
The particle model: solid, liquid and gas, changes of state, where a gas's pressure comes from, and the gas laws.
Unit 6 · 4 lessons
Solutions
Salt in water: dissolving, how much the water can hold, concentration in moles per litre, dilution, and separating mixtures.
Unit 7 · 4 lessons
Rates and energy changes
Why reactions are fast or slow: collisions, temperature, the activation barrier and catalysts, and the heat they give out or take in.
Unit 8 · 4 lessons
Equilibrium
Reactions that run both ways: dynamic equilibrium, the equilibrium constant, Le Chatelier's principle, and an ammonia plant.
Unit 9 · 4 lessons
Acids and bases
Ions in water: strong and weak acids and bases, pH as a logarithm, neutralisation, and titration drop by drop.
Unit 10 · 4 lessons
Redox and electrochemistry
Electrons passed from one substance to another: oxidation and reduction, the reactivity series, cells and electrolysis.
Unit 11 · 4 lessons
Organic chemistry
Chains of carbon: alkanes and homologous series, alcohols and carboxylic acids, and the polymers plastics are made of.
Unit 12 · 3 lessons
Materials and water
Bonding and solutions at work: strength from weak ingredients, choosing a metal by a tensile test, and fresh water from the sea.