GCSE Chemistry
Quantitative Chemistry
Quantitative Chemistry is a core strand in Chemistry. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
Relative Formula Mass
The relative formula mass (Mr) of a compound is the sum of the relative atomic masses (Ar) of all the atoms in its chemical formula.
Open guideConservation of Mass
The law of conservation of mass states that no atoms are lost or made during a chemical reaction.
Open guideBalancing Chemical Equations
Balancing Chemical Equations is one of the fastest-win GCSE Chemistry skills because the rule never changes: conserve the number of each type of atom on both si
Open guideMoles & Calculations
Moles Calculations are much easier when you treat the mole as a counting unit, not a mysterious extra topic.
Open guideAmount of Substance
The amount of substance is a measure of the number of particles in that substance, with the mole as the standard unit.
Open guideConcentration of Solutions
Concentration tells us how much of a substance (solute) is dissolved in a certain volume of a solvent.
Open guidePercentage Yield
Percentage yield is a measure of the efficiency of a chemical reaction.
Open guideAtom Economy
Atom economy is a measure of how efficiently a chemical reaction converts the atoms in the reactants into the desired product.
Open guideGas Volumes
At the same temperature and pressure, equal volumes of different gases contain the same number of molecules.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.