861 past contests
Topic 6 · Mass of a sparingly soluble hydroxide dissolved to form a given volume of saturated solution (ksp)
Topic 2 · Deducing an element's ionic charge and other compound formulas from a given phosphate formula
Topic 1 · Mass of lead(ii) iodide precipitate from a double displacement reaction with potassium iodide
Topic 1 · Minimum mass of oxygen required for a given mass of co2 in octane combustion
Topic 1 · Molar mass of a hydrated complex salt (potassium ferrocyanide trihydrate)
Topic 1 · Percentage of an element within a fertilizer given the percentage of its oxide
Topic 7 · Electrons needed to balance the reduction half-reaction of mno4- in basic medium
Topic 6 · Combining equilibrium constants of sequential/multiplied equilibrium steps
Topic 5 · Number of hydrogen atoms from carbon count and degrees of unsaturation
Topic 11 · Mass of propane burned from the volume of co2 produced at stp
Topic 11 · Mass of a gas from the ideal gas law given volume, temperature and pressure
Topic 20 · Mass of solute crystallizing on cooling a saturated solution (solubility curve)
Topic 2 · Enthalpy change of reaction from bond enthalpies (hess's law)
Topic 1 · Maximum mass of ammonia formed with a limiting reagent
Topic 1 · Relative atomic mass of a metal from the mass of its oxide
Topic 12 · Concentration of liberated iodine from an iodine-thiosulfate titration
Topic 5 · Total number of atoms in an empirical formula unit derived from a molecular formula
Topic 11 · Volume of hydrogen gas at stp from an alcohol reacting with excess sodium
Topic 10 · Heat energy to change the temperature of water using specific heat capacity
Topic 9 · Sum of coefficients in a balanced hydrocarbon combustion equation