861 past contests
Topic 2 · Enthalpy of polymerisation from bond energies
Topic 2 · Vsepr molecular shape of so2
Topic 11 · Graham's law: diffusion time from molar mass
Topic 1 · Temperature for a gas to reach a maximum volume at constant pressure
Topic 9 · Balancing a thermal decomposition equation
Topic 4 · Mass of chlorine required for a water-treatment dose
Topic 10 · Energy released from a mass of fuel using molar enthalpy of combustion
Topic 15 · Overall reaction order from individual rate-concentration factors
Topic 7 · Balancing a disproportionation redox equation
Topic 26 · Counting structural isomers of an alkane
Topic 5 · Molecular formula from percentage composition and molar mass
Topic 7 · Oxidation state determination across two compounds
Topic 11 · Charles's law: volume change of a gas at constant pressure
Topic 38 · Faraday's law: mass deposited during electrolysis
Topic 28 · Unpaired electrons in an anomalous ground-state configuration
Topic 11 · Graham's law of diffusion: relative rates and molar mass
Topic 19 · Percentage composition by mass in a compound
Topic 28 · Maximum electrons in a subshell from quantum numbers n and l
Topic 3 · Ph of a strong diprotic base solution
Topic 12 · Percentage purity from a neutralisation reaction