861 past contests
Topic 5 · Naming all possible hexenes with formula c6h12
Topic 23 · Chemical property difference between alkanol oh and phenolic oh
Topic 8 · Riddle: sodium as a group 1 metal that tarnishes and reacts with chlorine
Topic 10 · An isolated system exchanges neither energy nor matter (true/false)
Topic 10 · A closed system can exchange more than just heat across its boundary (true/false)
Topic 2 · Hydrogen halides in the pure state are covalent, not ionic (true/false)
Topic 2 · Non-metal oxides tend to be covalent (true/false)
Topic 10 · Endothermic reactions absorb heat from the surroundings (true/false)
Topic 2 · The carbon-silicon bond is covalent (true/false)
Topic 12 · Concentration of a carbonate solution from a methyl-orange titration
Topic 37 · Definition of an efflorescent chemical
Topic 37 · Sucrose is a deliquescent (not efflorescent) substance
Topic 37 · Definition of a deliquescent chemical
Topic 38 · Electrolytic cell: using current to drive a non-spontaneous reaction
Topic 39 · Voltaic (galvanic) cell: spontaneous reaction generating current
Topic 39 · Definition of an electrochemical cell
Topic 15 · Definition of the rate constant of a reaction
Topic 15 · Meaning of a second-order reaction
Topic 24 · Riddle: cellulose as a natural condensation polymer of glucose
Topic 7 · Unusual oxidation state of oxygen in hydrogen peroxide (true/false)