861 past contests
Topic 21 · Nitroglycerin as the active explosive component of dynamite
Topic 7 · Balanced equation for aluminium reacting with hot moderately concentrated sulfuric acid
Topic 25 · Balanced combustion equation for 2-heptanone
Topic 15 · Half-life of a first-order reaction from its rate and initial concentration
Topic 15 · Characteristics of explosive chemical reactions
Topic 2 · C-n bonds in amines are shorter than c-c bonds (true/false)
Topic 2 · The c-c triple bond is shorter than the c-c double bond, not the reverse (true/false)
Topic 2 · The so2 molecule has two pi bonds between sulfur and oxygen (true/false)
Topic 1 · Riddle: fritz haber, developer of the nitrogen-fixation (ammonia synthesis) process
Topic 6 · Avogadro's law: equal moles, not equal mass, occupy equal gas volume (true/false)
Topic 10 · The calorimeter for measuring enthalpy of neutralization
Topic 10 · Enthalpy of formation of co from hess's law using co2 formation and co oxidation enthalpies
Topic 10 · Distinguishing an open system from a closed system
Topic 1 · Mass of water (steam) released from complete combustion of 2-methylbutane
Topic 1 · Volume of o2 needed to completely combust nonane
Topic 1 · Volume of co2 released from complete combustion of heptane
Topic 28 · Hund's rule for filling degenerate orbitals singly before pairing
Topic 28 · The pauli exclusion principle for electron quantum numbers
Topic 28 · The aufbau principle for ground-state electron configuration
Topic 2 · Inductive effect of methyl groups increasing arsenic's electron-donating ability