861 past contests
Topic 38 · Faradays of charge needed to discharge one mole of bromine from molten kbr (true/false)
Topic 1 · Riddle: carbon dioxide as a nonpolar triatomic molecule that sublimes readily
Topic 14 · Sodium carbonate resists thermal decomposition under ordinary heating (true/false)
Topic 14 · Lead(ii) carbonate paint blackening via lead sulfide formation (true/false)
Topic 34 · Boiling calcium hydrogencarbonate solution precipitates calcium carbonate (true/false)
Topic 1 · Mass of iron extractable from an ore given the ore's pyrite content
Topic 20 · Mass of gold extractable from ore given its concentration in parts per million
Topic 24 · Fungal cell walls are chitin, not cellulose (true/false)
Topic 19 · Mass of ethanoic acid obtainable from ethanol at a given percentage yield
Topic 23 · Organic compound classes with an -oh group, and a butanol isomer
Topic 26 · Cis/trans stereoisomers of 2-pentene
Topic 30 · Statements not part of dalton's atomic theory (identical mass for same element)
Topic 30 · Statements not part of dalton's atomic theory (nucleus/electrons)
Topic 30 · Statements that are part of dalton's atomic theory (different elements differ; simple whole-number combination)
Topic 14 · Elements found uncombined in nature (gold and argon among gold/manganese/argon)
Topic 14 · Elements found uncombined in nature (carbon among mercury/sodium/carbon)
Topic 14 · Elements found uncombined in nature (sulphur among sulphur/iron/magnesium)
Topic 14 · Riddle: sodium chloride, an ionic condiment
Topic 39 · Voltaic cells are also called galvanic cells (true/false)
Topic 38 · Electrolytic and voltaic cells are both electrochemical cells (true/false)