861 past contests
Topic 30 · Completing dalton's statement on atoms combining in simple whole-number ratios
Topic 14 · Iron(ii) sulfide colour is black, not blue (true/false)
Topic 30 · Mendeleev's periodic table preceded thomson's plum-pudding model
Topic 34 · Calcium sulfide is soluble, giving no precipitate with h2s (true/false)
Topic 30 · Attributing 'atoms of different elements differ' to john dalton
Topic 15 · Rate constant of a first-order reaction from its half-life
Topic 16 · Differences between a watch glass and an evaporating dish
Topic 16 · The beaker as suitable glassware for dissolving a solid in a moderate water volume
Topic 25 · Riddle: vladimir markovnikov of markovnikov's rule
Topic 3 · Ph of beer (true/false)
Topic 3 · Ph of human gastric contents (true/false)
Topic 3 · Ph of human milk (true/false)
Topic 4 · Increasing order of troposphere gas concentrations (co2, argon, o2, n2) (true/false)
Topic 22 · Trivial name of butanoic acid (butyric acid) from latin 'butyrum' (butter)
Topic 22 · Trivial name of ethanoic acid (acetic acid) from latin 'acetum' (vinegar)
Topic 22 · Trivial name of methanoic acid (formic acid) from latin 'formica' (ant)
Topic 28 · Collective name for elements filling the 4f or 5f subshells
Topic 28 · The energy level at which the f subshell first appears
Topic 28 · Maximum number of electrons in an f subshell
Topic 41 · Rusting of iron: initial oxidation to iron(ii), requiring both oxygen and moisture (true/false)