861 past contests
Topic 22 · Carboxylic acid + sodium bicarbonate effervescence test
Topic 22 · Ester hydrolysis (saponification) with naoh: loss of the sweet ester smell
Topic 14 · Riddle: tin (sn), from latin 'stannum', extracted from cassiterite
Topic 7 · Manganese oxidation state of +3 in mn2o3 (true/false)
Topic 7 · Manganese oxidation state in k2mno4 is +6, and in kmno4 is +7 (not +8) (true/false)
Topic 7 · Mn(+7) is easily reduced to mn(+2) in acidic media (true/false)
Topic 38 · Carbon electrodes in molten alumina electrolysis: both can be carbon, but only the anode burns off (true/false)
Topic 7 · Simply heating bauxite does not yield pure alumina; chemical processing is required (true/false)
Topic 22 · Acid chloride formation from a carboxylic acid and pcl5
Topic 22 · Amide formation from a carboxylic acid and ammonia
Topic 22 · Ammonolysis of an ester to form an amide
Topic 1 · Mass of silver from thermal decomposition of silver(i) oxide at a given efficiency
Topic 11 · Volume of oxygen at stp from thermal decomposition of silver(i) oxide
Topic 1 · Mass of silver(i) oxide needed to yield a given mass of silver (100% efficient)
Topic 30 · Rutherford's gold-foil experiment: three observations and the conclusions they support
Topic 14 · Riddle: bromine, the only liquid non-metal element
Topic 37 · Steel as a solid solution alloy of two solids (true/false)
Topic 33 · The blast furnace flux is limestone, not sand (true/false)
Topic 14 · Aluminium cookware use is not linked to proven poisoning (true/false)
Topic 34 · Calcium sulfide is soluble, giving no precipitate with h2s (true/false)