861 past contests
Topic 11 · Density of a gas at stp from its molar mass
Topic 5 · Molecular formula of the nth member of a homologous series
Topic 11 · Partial pressure of a gas in a mixture using dalton's law
Topic 12 · Concentration of a base from a neutralization titration with a known total volume
Topic 19 · Empirical formula of an oxide from percent composition and atomic mass
Topic 1 · Vapor pressure of a solution using raoult's law
Topic 20 · Mass of solute required to prepare a solution of a given volume and molarity
Topic 1 · Mass percent of water lost from a heated hydrated salt sample
Topic 11 · Number of molecules in a given volume of ideal gas at stp
Topic 12 · Concentration of excess (unreacted) acid remaining after a titration
Topic 1 · Relative atomic mass from isotopic abundance
Topic 11 · Combined gas law: finding volume from changes in pressure and temperature
Topic 12 · Acid-base neutralization: mass of a solid base needed for a given acid volume and concentration
Topic 35 · Noble gases (group 18): reactivity trends and stability of known compounds
Topic 26 · Constitutional isomers of a haloalkane (c5h11cl) with an alkyl substituent
Topic 2 · Factors affecting the likelihood of ionic bond formation: electronegativity, ionization energy and electron affinity
Topic 4 · Riddle: acid rain
Topic 3 · Buffer solution ph: henderson-hasselbalch equation (true/false)
Topic 2 · Sigma and pi bond counting in hydrocarbons using total-atom and bond-order shortcuts
Topic 1 · Mole-volume relationships: gas volume produced from mass of a hydrocarbon burned in combustion