861 past contests
Topic 1 · Moles of dichlorine heptoxide needed to produce a given amount of perchloric acid
Topic 5 · Riddle: butane, a four-carbon alkane component of lpg
Topic 22 · Formic acid (ch2o2) causes the itch from ant bites
Topic 4 · Converting a co concentration from ppm to percentage
Topic 10 · Volume of an ideal gas from moles, pressure and temperature, via pv=nrt (atm)
Topic 10 · Volume of an ideal gas from moles, temperature and pressure in kpa, via pv=nrt
Topic 20 · Molarity of aluminum nitrate from its mass and solution volume
Topic 1 · Mass of molybdenum carbide formed from reacting a mass of moo2 with excess carbon
Topic 11 · Minimum volume of oxygen at stp to completely combust one mole of pentene
Topic 14 · Riddle: silver chloride, a light-sensitive coinage-metal halide
Topic 5 · True or false: rcho represents an aldehyde
Topic 23 · True or false: roh represents only a primary alcohol
Topic 22 · True or false: rcl represents an acid chloride
Topic 4 · True or false: sulfur dioxide can be detected by its odor
Topic 4 · True or false: carbon monoxide gas can be detected by its odor
Topic 4 · True or false: ozone gas can be detected by its odor
Topic 6 · Equilibrium constant kc for a+b⇌2c from given equilibrium concentrations
Topic 12 · Mass of naoh needed to neutralize a given volume and concentration of hno3
Topic 31 · Element symbols: rh=rhodium, ra=radium, te=tellurium
Topic 9 · Sum of coefficients for combustion of iron pyrite (fes2) to iron(ii) oxide and sulfur dioxide