IGCSE Chemistry Notes (0620)
12 free chapter notes with diagrams, worked examples and quizzes, plus night-before sheets.
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Chemistry gets easier once the patterns are clear: what reacts with what, and why. These chapter notes cover the Cambridge IGCSE Chemistry (0620) course, from states of matter to organic chemistry and chemical analysis. Each one opens with a 30-second summary and finishes with questions you can mark yourself.
12 chapter notes
- 1States of matterWhy solids keep their shape, why gases fill a room, and what really happens to the particles when you heat, cool or squash a substance — plus diffusion, explained properly.~12 min read · Core + Extended
- 2Atoms, elements, compounds & bondingInside the atom, how electrons are arranged, and why atoms join up — ionic, covalent and metallic bonding — with the structures and properties that follow from each.~18 min read · Core + Extended
- 3Stoichiometry — formulae & molesFormulae, balanced equations and mole calculations, one step at a time — including limiting reactants, titration, empirical formulae and percentage yield.~19 min read · Core + Extended
- 4ElectrochemistryHow electricity splits compounds, how to predict what appears at each electrode in seconds, how electroplating works — and how a fuel cell turns hydrogen into electricity.~15 min read · Core + Extended
- 5Chemical energeticsWhy reactions get hot or cold, how to read an energy-profile diagram, and how to calculate the energy change of a reaction from bond energies.~9 min read · Core + Extended
- 6Rates, equilibrium & redoxWhy some reactions are fast and others slow, how to speed them up and read a rate graph, what equilibrium really means (with the Haber and Contact processes) and how to spot oxidation and reduction.~17 min read · Core + Extended
- 7Acids, bases & saltsThe pH scale and indicators, what acids do to metals, bases and carbonates, how neutralisation works at ion level — and the right method for making any salt.~14 min read · Core + Extended
- 8The Periodic TableThe map of all elements: why groups behave alike, why Group I gets more reactive down and Group VII gets less — plus transition elements and the noble gases.~12 min read · Core + Extended
- 9MetalsWhat makes a metal a metal, why alloys beat pure metals, how the reactivity series predicts everything, how to stop rusting — and how iron and aluminium are extracted.~14 min read · Core + Extended
- 10Chemistry of the environmentSafe drinking water, what fertilisers do (and the damage they cause), what is in the air, where pollutants come from — and the chemistry behind acid rain and climate change.~12 min read · Core + Extended
- 11Organic chemistryThe chemistry of carbon compounds made clear: how to name and draw them, crude oil and cracking, alkanes and alkenes, alcohols, acids, esters and polymers.~14 min read · Core + Extended
- 12Experimental techniques & chemical analysisThe practical skills behind every Paper 6 question: which apparatus to use, how to separate and purify, how to read a chromatogram and run a titration, and every test for ions and gases.~15 min read · Core + Extended
Night-before sheets
- ★Chemistry Facts, Equations & TestsEvery test and colour, the mole calculations, key equations, industrial processes and the reactivity series on one sheet. Learn the tests word for word, because examiners mark the exact observation.
- ★Chemistry ATP Shortcuts (Paper 6)The practical skills sheet: apparatus and readings, titrations, collecting gases, rates and energy, chromatography, planning and evaluating. Written for the practical and alternative-to-practical papers.
Frequently asked questions
Are these IGCSE Chemistry notes free?
Yes. Every chapter note is free to read online and to save as a PDF. They are free to share with friends, but not to sell.
Do the notes cover both Core and Extended?
Yes, in one note. Extended-only material carries an EXTENDED tag, so Core students can skip it.
Which syllabus do the notes follow?
Cambridge IGCSE Chemistry (0620).
How do I download a note as a PDF?
Tap Download PDF at the top of any note. The PDF file saves straight to your phone or computer, ready to print or revise offline.
How should I use these notes?
Read a chapter note, do the quick check, practise a paper with the Paper Generator, then finish with the night-before sheet.
Who writes the notes?
Riyaz Shaikh ("Riyaz Sir"), a Mumbai-based mentor with 15+ years of experience teaching IGCSE, IB and A Level one-to-one.
Message Riyaz Sir: one-to-one IGCSE Chemistry mentoring, online or in Mumbai.