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It is considered to be the most difficult
Chemistry exam throughout the world, the difficulty of Final round is much harder than IChO. The difficulty of the preliminary round is often enough to surpass IChO, also. Its problems are often beyond the abilities of an overwhelming majority of
164:(An interesting fact is that before 2011 the final round took part in the next January after the preliminary round, but some reforms were launched and consequently the time was altered to the end of the year in 2011.)
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undergraduates. (As a consequence, IChO problems are regarded as "beginners' exercises" among those
Chinese students.)
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Preliminary round: Usually held around the end of August and the beginning of
September each year.
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Final round: Usually held around the end of
November and the start of December.
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140:The first CChO was held in 1984, 16 years after
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193:. Ccs.ac.cn. 2009-11-29. Archived from
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278:Recurring events established in 1984
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237:有关全国高中学生化学竞赛变更名称的公告
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