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IChO · International Chemistry Olympiad

Chemistry olympiad practice.

Physical, inorganic and organic problems in the style of IChO theory papers.

Tier
Topic

Feeder round

How pure is the chalk?Feeder roundAnalytical & stoichiometry
Pushing an esterificationFeeder roundPhysical chemistry
Which butanol is in the bottle?Feeder roundOrganic synthesis & mechanisms
Plating a medal and running a Daniell cellFeeder roundElectrochemistry

National final

Werner's cobalt puzzleNational finalInorganic & coordination
A fruity ester from four spectraNational finalSpectroscopy & structure
Nitrosyl bromide: rate law to mechanismNational finalPhysical chemistry
Oxygen in the river: the Winkler methodNational finalAnalytical & stoichiometry

International

Building a second ringInternationalOrganic synthesis & mechanisms
Reading a hydrogen chloride spectrumInternationalSpectroscopy & structure
Why copper(I) disappears, and why iodide saves itInternationalElectrochemistry
Magnetite: an inverse spinelInternationalInorganic & coordination