International Chemistry Olympiads (IChO) are chemistry competitions made for high school students provided they are not yet 20 years old, and not registered in a tertiary institution. IChO are organized each year in a different country and last about one week. There are two sorts of exams, a theoretical examination and some tests in the lab. Both last usually 5 hours. For each part of the competition, the students get points according to a grading scheme. At the end, the points are added, and the best are receiving gold, silver or bronze medals. Each country may send four students, that they select with their proper procedure during the year preceding the Olympiad. The last IChO happened in Thailand 2017, Prague 2018 and Paris 2019. In 2020 it should have been done in Istanbul. But the competition was restricted to a theoretical one and it had to be done online because of the Corona-virus pandemic.
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