Key Concepts in Chemistry
A GCSE Chemistry revision hub covering the core key concepts underpinning the whole course, including particle model, atomic structure, bonding and calculations, with links to topic pages and concise explanations
GCSE SUMMARY VIDEOS:
The three videos you see below are summary videos for the entire Key Concepts area of the GCSE - the content that can come up on both papers. Have a watch and see how you get on!
Atomic Structure and the Periodic Table
A GCSE chemistry revision page on atomic structure covering subatomic particles, electronic structure and shells, isotopes, relative mass/calculations, how to draw atom diagrams, and the development of atomic models with examples and explanations.
Ionic Bonding
A GCSE chemistry revision page on ionic bonding explaining how ions form from atoms, how oppositely-charged ions attract to form ionic compounds, drawing dot-cross diagrams, lattice structures, and the typical properties of ionic substances.
Covalent Bonding
GCSE revision page on covalent bonding covering what covalent bonds and molecules are, drawing dot-and-cross diagrams using valency, simple molecular properties (melting/boiling, conductivity), giant covalent structures, diamond vs graphite, and graphene/fullerenes/nanotubes.
Types of Substance - Ionic, Covalent or Metallic?
A GCSE chemistry revision page on types of substance, explaining the properties of metals and non-metals, what polymers are, models of substances (2D/3D/dot-cross/ball-and-stick), identifying bonding types from data and practical tests for bonding types.
Calculations involving Masses
A GCSE chemistry revision page on calculations, covering relative formula mass, empirical formula, conservation of mass, concentration, moles, Avogadro’s constant, limiting reactants, and stoichiometric working with examples and step-by-step explanations.
A complete overview of core GCSE Chemistry concepts including atomic structure, bonding, particle theory, energy changes, rates of reaction, and quantitative ideas to support revision across the whole course.