861 past contests
Topic 39 · Primary cells cannot be recharged (true/false)
Topic 22 · Carboxylic acids are proton donors but not reducing agents (true/false)
Topic 23 · True or false: alcohols as reducing agents (and not oxidizing agents)
Topic 7 · Minimum moles of h+ needed to complete a permanganate/iron(ii) reaction
Topic 7 · Volume of dilute sulfuric acid needed with a 50% excess for a redox reaction
Topic 7 · Concentration of fe2+ from a permanganate titration
Topic 1 · Identity of soapless (synthetic) detergents
Topic 13 · Why temporary water hardness is so named (removable by boiling)
Topic 13 · Cations responsible for permanent water hardness
Topic 36 · Products of heating limestone with clay (calcium silicate, oxide, aluminate)
Topic 36 · Raw materials for soda glass versus pyrex glass
Topic 36 · Product of heating limestone with sand (calcium silicate)
Topic 6 · Salt lowers ice's melting/freezing point (freezing-point depression on roads)
Topic 7 · Riddle: oxidation number, related to oxygen's electron-gaining tendency
Topic 26 · Restricted rotation about a c=c bond enabling cis/trans stereoisomers
Topic 5 · Strong, low-reactivity c-h bonds underlying hydrocarbon stability
Topic 5 · Functional groups determining physical/chemical properties of organic molecules
Topic 26 · Cis-trans isomerism is not a form of positional isomerism (true/false)
Topic 26 · Mirror-image compounds are generally enantiomers (true/false)
Topic 26 · Cis-trans isomerism is a form of stereoisomerism (true/false)