Problems

Previous preparatory problems


50th International Chemistry Olympiads

Bratislava, Slovakia and Prague, Czech Republic
From 19 to 29 July 2018

Theoretical Preparatory Problem IChO 2018
Practical Preparatory Problem IChO 2018

49th International Chemistry Olympiads

Nakhon Pathom, Thailand
From 6 to 15 July 2017

Preparatory Problem IChO 2017

48th International Chemistry Olympiads

Tbilisi, Georgia
From 23 July to 1st August 2016

Preparatory Problem IChO 2016

47th International Chemistry Olympiads

Baku, Azerbaijan
From 20 to 29 July 2015

Preparatory Problem IChO 2015