861 past contests
Topic 20 · Concentration of a solution from mass of solute and volume
Topic 10 · Molecular mass of an alkane from heat of combustion and mass burned
Topic 12 · Volume of naoh required to neutralize a given mass of acetic acid
Topic 11 · Total pressure of a gas mixture using the ideal gas law
Topic 34 · Complex ions: oxidation states and coordination number of central metals
Topic 12 · Volume of naoh required to neutralize a diprotic acid
Topic 1 · Number of hydrogen atoms in a given mass of an organic compound
Topic 1 · Mass of a compound from a given number of moles
Topic 1 · Moles of co2 produced from complete combustion of a hydrocarbon
Topic 10 · Heat released from molar enthalpy of solution and mass dissolved
Topic 3 · Buffer solution ph: henderson-hasselbalch equation
Topic 1 · Number of atoms in a given mass of a molecular compound
Topic 17 · Mass of ammonia formed from nitrogen gas (haber process stoichiometry)
Topic 5 · Systematic name of an organic compound from its molecular formula (degree of unsaturation)
Topic 1 · Number of water molecules in a hydrate from a mass-equality condition
Topic 2 · Enthalpy change of reaction from bond enthalpies (hess's law)
Topic 19 · Molecular formula from percent composition and a given molar mass
Topic 20 · Equilibrium concentration from kc for a simple a(g) <-> b(g) equilibrium
Topic 20 · Volume of stock solution required for a dilution (c1v1 = c2v2)
Topic 11 · Volume of an ideal gas from moles, temperature and pressure (pv = nrt)