861 past contests
Topic 2 · Mgo is ionic while mgh2 shows mixed ionic/covalent character (true/false)
Topic 14 · Nitrogen forms more than three distinct oxides (true/false)
Topic 14 · Sodium forms three distinct oxides under different conditions (true/false)
Topic 6 · Solubility from ksp for a salt of formula ab (1:1 ratio)
Topic 6 · Solubility from ksp for a salt of formula ab2
Topic 2 · Predicting bond type between two elements from their atomic numbers (metal + nonmetal)
Topic 2 · Predicting bond type between two elements from their atomic numbers (nonmetal + metalloid)
Topic 2 · Predicting bond type between two elements from their atomic numbers (nonmetal + nonmetal)
Topic 6 · Freezing-point depression of ice by impurities
Topic 21 · Riddle: petrol as a fractional-distillation cut of crude oil
Topic 33 · Methods of concentrating gold ore: cyanidation, amalgamation, and the purpose of roasting
Topic 28 · Correct statement of the pauli exclusion principle (true/false)
Topic 22 · Carbolic acid identity: phenol versus aromatic carboxylic acid (true/false)
Topic 22 · The functional group in urea (amide, not amino) (true/false)
Topic 10 · Enthalpy of condensation from enthalpies of formation of liquid and gaseous states
Topic 10 · Enthalpy of reaction from standard enthalpies of formation of reactants and products
Topic 10 · Enthalpy of formation of one species from a reaction enthalpy and another species' enthalpy of formation
Topic 5 · Systematic name of a symmetrical straight-chain alkanone
Topic 5 · Systematic naming of a straight-chain alkane from carbon count