Chemistry
GCSE ยท OCR Gateway,
Build your own quiz, flashcard deck, or exam paper from multiple subtopics.
14 cheat sheets
Ionic, Covalent & Metallic Bonding
Ionic, covalent and metallic bonding, dot-and-cross diagrams, properties and how bonding type affects melting point and conductivity.
Atomic Structure & Electron Shells
Atoms, elements, compounds, isotopes, relative atomic mass and electron shell rules for GCSE Chemistry.
The Periodic Table
Groups, periods, trends in reactivity, noble gases and how the periodic table is organised.
States of Matter & the Particle Model
The three states of matter, particle arrangements and forces, changing state, energy changes during melting and boiling, and state symbols in equations.
Acids, Bases & Titration
pH scale, acid-alkali neutralisation, strong vs weak acids, acid reactions and salt naming, and the titration method with concordant titres.
Electrolysis
Splitting ionic compounds using electricity - what electrolysis is, the molten aluminium oxide example, and rules for aqueous solutions.
Energy Changes
Exothermic vs endothermic reactions, reaction profiles with activation energy, and bond energy calculations including worked examples.
Alkanes, Alkenes & Alcohols
Naming rules, alkane and alkene structures, alcohols, carboxylic acids and esters - functional groups, reactions, general formulae and the first four members of each family.
Rate of Reaction
What rate of reaction means, how to measure and calculate it, collision theory, the four factors that affect rate, and how catalysts work.
Reversible Reactions & Equilibrium
Reversible reactions, dynamic equilibrium, Le Chatelier's principle and how temperature, pressure and concentration shift equilibrium.
Chemical Tests
Gas tests, flame tests, cation tests with NaOH, and anion tests for halides, sulfates, nitrates and carbonates.
Addition & Condensation Polymers
Addition and condensation polymerisation, polyesters and polypeptides with worked equations, examples of common polymers, and disposal issues.
Crude Oil, Fractions & Combustion
Hydrocarbons and alkanes, fractional distillation column, cracking long-chain alkanes, complete and incomplete combustion, and atmospheric pollutants.
Separation Techniques
Filtration, crystallisation, simple and fractional distillation, and paper chromatography - methods, apparatus, and when to use each technique.
