861 past contests
Topic 20 · True or false: a sugar solution is an example of a solid-in-liquid solution
Topic 2 · The o-h bonds in water are polar covalent bonds
Topic 9 · Sum of stoichiometric coefficients in balanced 3o2+4ch4→6h2o+2c2h2
Topic 20 · Concentration of mgso4 dissolved to a given volume
Topic 19 · Percentage by mass of oxygen in kclo4
Topic 19 · Percentage by mass of chromium in sodium dichromate
Topic 19 · Percentage by mass of manganese in mn2o7
Topic 3 · Identifying the stronger base when h2so4+cl⁻⇌hcl+hso4⁻ lies far left
Topic 3 · Identifying the stronger acid when h2s+nh2⁻⇌hs⁻+nh3 lies far left
Topic 3 · Identifying the stronger acid when cn⁻+h2o⇌hcn+oh⁻ lies far right
Topic 27 · Riddle: the mass spectrometer, identifying compounds via mass-to-charge ratio
Topic 2 · True or false: the simplest alkyne has three sigma bonds
Topic 2 · True or false: the simplest alkene has four sigma bonds
Topic 2 · True or false: the simplest alkyne has two pi bonds
Topic 3 · True or false: a brønsted-lowry acid always contains at least one hydrogen atom
Topic 3 · True or false: a brønsted-lowry acid may accept more than one proton
Topic 3 · True or false: a compound without hydroxide ion cannot be a brønsted-lowry base
Topic 6 · Maximum chloride concentration to precipitate lead(ii) chloride, from ksp
Topic 27 · Sum of protons, electrons and neutrons in the most stable isotope of sodium
Topic 9 · Sum of stoichiometric coefficients in balanced c+hno3→no2+co2+h2o