International Chemistry Olympiad

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The International Chemistry Olympiad (IChO) is an annual academic competition for high school students. It is one of the International Science Olympiads.

The first IChO was held in Prague, Czechoslovakia, in 1968. The event has been held every year since then, with the exception of 1971. The delegations that attended the first events were mostly countries of the former Eastern bloc and it was not until 1980, the 12th annual International Chemistry Olympiad, that the event was held outside of the bloc in Austria. Up to 4 students for each national team compete around July in both a theoretical and an experimental sections, with about half of the participants being awarded medals.[1]

Structure and rules[edit]

An International Chemistry Olympiad medal for 29th IChO, held at Montreal, Canada.

Each delegation consists of up to four students and two mentors (one of them is designated as the head of the delegation or "head mentor"). A delegation may also include a handful of guests and scientific observers. Students must be under the age of 20 and must not be enrolled as regular students in any post-secondary education institution. The International Information Center of the International Chemistry Olympiad is based in Bratislava, Slovakia.

Countries who wish to participate in the IChO must send observers to two consecutive olympiads before their students can participate in the event. A total of 68 countries took part in the 38th IChO in 2006: 67 as participants and 1 as an observer. In 2017 more than 80 countries are expected to send students.

The competition consists of two examinations, a theoretical examination and a practical examination. Both have durations of up to 5 hours, and are held on separate days with the practical examination usually being before the theoretical examination. The theoretical examination has a value of 60 points and the practical examination has a value of 40 points. Each examination is evaluated independently from the other and the sum of the results of the examinations determines a participant's overall result. A scientific jury, which is installed by the host country, suggests the tasks. The international jury, which consists of the 2 mentors from each of the participating countries, discusses the competition tasks and translates them into the language of their students' preference.

Students receive the examinations translated into their languages of preference. It is the duty of the mentors to translate the examinations from English before they are given to the participants. After the examinations are held and evaluated by a committee appointed by the host country and before awards are presented, mentors discuss the evaluation of the exams with judges of the committee to assure fairness in their evaluation. Because the mentors review the examinations before they are given to participants, any communication between the mentors and the students is strictly forbidden prior to the completion of both exams, and the students are required to surrender any mobile phones and laptop computers to the organizer.

The syllabus of the competition contains subjects from several areas of chemistry, including organic chemistry, inorganic chemistry, physical chemistry, analytical chemistry, biochemistry, and spectroscopy. Though some of these subjects are included in most secondary school chemistry programs, for the most part, they are evaluated at a much deeper level and many may require a level of knowledge and understanding comparable to that of post-secondary education. In addition, the host country of each IChO issues a set of preparatory problems well in advance of the competition every year. These preparatory problems cover specific topics in considerable more depth than typical post-secondary education. Preparation for the International Chemistry Olympiad demands a high level of understanding and interest in chemistry and an outstanding ability to relate chemical subjects with one another as well as with the practical world.

A gold medal from the 40th IChO

All participants are ranked based on their individual scores and no official team scores are given. Gold medals are awarded to approximately the top 10% of students, silver medals are awarded to approximately the next 20% of students, and bronze medals are awarded approximately to the next 30% of students. The exact number of medals is decided on the blind review of the results. Honorable mentions are awarded to the next top 10% of the participants that do not win a medal. One special award is given to the student that achieves the highest score overall. Two separate special awards are given to the students who get the best score in the theoretical and practical examinations.

These events are also outstanding opportunities for the students to meet people from all around the world who share similar interests, to visit different places, and to get in touch with different cultures. As the aims of the competition establish, the IChO competitions help to enhance friendly relations among young people from different countries; they encourage cooperation and international understanding.


While each country is free to choose its team by whatever means it seems appropriate, the selection process usually involves holding regional and national olympiad competitions. Many countries hold "training camps" for its top students, where mentors from the country give the students accelerated college-level courses in chemistry with an emphasis on the topics covered in that year's preparatory problems as well as practical training. It is agreed that such training programs must not exceed a total duration of two weeks but there are allegations every year that some countries exceed this limit by months or even years. Another concern is that some countries tend to bring the same students to the competition year after year, which helps them win better medals. Although some believe that this is against the spirit of the olympiad, many nations find it hard to justify leaving their best students at home.


The idea of the International Chemistry Olympiad was developed in the former Czechoslovakia in 1968. It was designed with the aim to increase the number of international contacts and the exchange of information between nations. Invitations were sent by the Czechoslovak national committee to all Warsaw Pact countries, except Romania (due to political issues between Romania and USSR). However, in May 1968, relations between Czechoslovakia and the Soviet Union became so delicate that only Poland and Hungary participated in the first international competition.[2]

The first International Chemistry Olympiad took place in Prague between 18 and 21 June 1968. Each of the three participating countries sent a team of six students, and four theoretical tasks were to be solved. Guidelines for the next competitions were already suggested.[3] The second chemistry Olympiad took place in 1969 in Poland, and Bulgaria also participated, with USSR and GDR only sending observers. Each team consisted of five pupils, and an experimental competition was added. The decision was made to invite more socialist countries to future competitions and to limit the number of pupils to four. The third Olympiad in 1970 was organized in Hungary with the GDR, Romania and the Soviet Union as new countries. In this competition, more than three prizes were distributed for the first time.[2]

There was no Olympiad held in 1971, as at the end of the competition in 1970, an organizer and host for the next event could not be agreed on. This was solved for the next three years by diplomatically agreeing on the Soviet Union to host 1972, Bulgaria in 1973, and Romania in 1974, starting the tradition to decide the host years in advance. 1972 was the first time where preparation tasks for the International Chemistry Olympiad were created. Also, at a jury session, it was suggested that invitations should be sent to Vietnam, Mongolia, and Cuba. Unfortunately though, these invitations were not sent, leaving seven to compete in 1973.[2]

In 1974, Romania invited Sweden and Yugoslavia to the Olympiad in Bucharest and Germany and Austria sent observers. The Federal Republic of Germany was the first NATO-country with an observer present and this was only able to occur because the Brandt government had contracts in the East. Thus, in 1975, West Germany, Austria, and Belgium also participated in the International Chemistry Olympiad.[2]

The first Olympiad in a non-socialist country took place 1980 in Linz in Austria, although the Soviet Union did not participate. Since then the number of the participating countries has increased steadily. In 1980, only 13 nations took part but this number increased to 21 by the 1984 Olympiad in Frankfurt/Main.[4] With the fall of the Iron Curtain and the break-up of the Soviet Union into independent states in the early 1990s, the number of participants increased again. In addition, the increasing interest of Asian and Latin American countries became apparent with the numbers of participants. Altogether 47 delegations participated in 1998. Presently, 84 countries are invited to the International Chemistry Olympiads.[5]

The current ten countries with the best all-time results are as follows:[6]

Rank Country Gold Silver Bronze Honorable Mentions
1  China 103 29 4 0
2  South Korea 69 31 17 1
3  Russia 66 34 11 0
4  Taiwan 57 51 11 0
5  United States 49 66 33 1
6  Poland 44 75 62 4
7  Iran 39 52 24 1
8  Singapore 38 54 36 0
9  Hungary 37 84 53 7
10  Romania 32 72 57 8


Teams[2] New teams[2]
1 1968 Prague  Czechoslovakia June 18–21 3 Czechoslovakia, Poland, Hungary
2 1969 Katowice  Poland June 16–20 4 Bulgaria
3 1970 Budapest  Hungary July 1–5 7 GDR, Romania, Soviet Union
1971 not held
4 1972 Moscow  Soviet Union July 1–10 7
5 1973 Sofia  Bulgaria July 1–10 7
6 1974 Bucharest  Romania July 1–10 9 Sweden, Yugoslavia
7 1975 Veszprém  Hungary July 1–10 12 Austria, FRG, Belgium
8 1976 Halle  East Germany July 10–19 12
9 1977 Bratislava  Czechoslovakia July 4–14 12 (observers from UNESCO)
10 1978 Toruń  Poland July 3–13 12
11 1979 Leningrad  Soviet Union July 2–11 11
12 1980 Linz  Austria July 13–23 13 Netherlands, Italy
13 1981 Burgas  Bulgaria July 13–23 14 France
14 1982 Stockholm  Sweden July 3–12 17 Yugoslavia, Denmark, Norway
15 1983 Timișoara  Romania July 2–11 18 United Kingdom
16 1984 Frankfurt  West Germany July 1–10 21 Greece, Kuwait, USA
17 1985 Bratislava  Czechoslovakia July 1–8 22 Cuba
18 1986 Leiden  Netherlands July 6–15 23 Canada
19 1987 Veszprém  Hungary July 6–15 26 Switzerland, China
20 1988 Espoo  Finland July 2–9 26 Australia, Singapore
21 1989 Halle  East Germany July 2–10 26
22 1990 Paris  France July 8–17 28 Cyprus, Thailand
23 1991 Łódź  Poland July 7–15 30 Latvia, Lithuania, Slovenia
24 1992 Pittsburgh and
Washington, D.C.
 United States July 11–22 33 New Zealand
25 1993 Perugia  Italy July 11–22 38 Iran, Slovakia, Czech Republic,
Venezuela, Mexico, Taiwan, Korea
26 1994 Oslo  Norway July 3–11 [7] 39 Estonia, Turkey, Ukraine
27 1995 Beijing  China July 13–20 [8] 42
28 1996 Moscow  Russia July 14–23 [9] 45
29 1997 Montreal  Canada July 13–22 [10] 47
30 1998 Melbourne  Australia July 5–14 [11] 47
31 1999 Bangkok  Thailand July 4–11 [12] 52 India
32 2000 Copenhagen  Denmark July 2–11 [13] 53[14]
33 2001 Mumbai  India July 6–15 [15] 54[16]
34 2002 Groningen  Netherlands July 5–14 [17] 57[18]
35 2003 Athens  Greece July 5–14 [19] 60[20]
36 2004 Kiel  Germany July 18–27 [21] 61[22]
37 2005 Taipei  Taiwan July 16–25 [23] 59[24]
38 2006 Gyeongsan  South Korea July 1–11 [25] 66[26] Israel
39 2007 Moscow  Russia July 15–24 [27] 68[14]
40 2008 Budapest  Hungary July 12–21 [28]
41 2009 Cambridge  United Kingdom July 18–27 [29]
42 2010 Tokyo  Japan July 19–28 [30]
43 2011 Ankara  Turkey July 9–18 [31]
44 2012 Washington, D.C.  United States July 21–30 [32]
45 2013 Moscow  Russia July 15–24 [33] 74[34]
46 2014 Hanoi  Vietnam July 20–29 [35]
47 2015 Baku  Azerbaijan July 20–29 [36]
48 2016 Tbilisi  Georgia July 23 – August 1 [37]
49 2017 Nakhon Pathom  Thailand July 6–15 [38] 76[39]
50 2018 Bratislava
 Czech Republic
July 19–29 [5] 76[40]
51 2019 Paris  France July 21–30 [41] 80
52 2020 İstanbul  Turkey July 23–30 [42]
53 2021 Osaka  Japan July 24 – Aug 2 [5]
54 2022 Tianjin  China July 10–20 [5]
55 2023 Zürich   Switzerland July 16–25 [5]
56 2024 Riyadh  Saudi Arabia [5]
57 2025 Dubai  United Arab Emirates [5]

Remote IChO[edit]

Due to the COVID-19 pandemic, IChO 2020 and 2021 were organized remotely without a laboratory exam in order to keeping the Olympic spirit of collaboration and peace even in harsh times.[43]

See also[edit]


  1. ^ Celebrating the Golden Jubilee of the International Chemistry Olympiad: Back to Where It All Began
  2. ^ a b c d e f "39th INTERNATIONAL CHEMISTRY OLYMPIAD". Retrieved 2018-04-28.
  3. ^ "International Chemistry Olympiad - ICHO". IIT JEE, NEET, CET, Olympiads, Boards, NTSE, CBSE, HSC, PU. Retrieved 2021-09-23.
  4. ^ Glavin, Chris (2018-09-27). "History of International Chemistry Olympiad | K12 Academics". Retrieved 2021-09-23.
  5. ^ a b c d e f g "IChO Steering Committee website".
  6. ^ "List of Countries". Retrieved 2021-08-28.
  7. ^ "the 26th International Chemistry Olympiad".
  8. ^ "Markku's IChO Home Page". Archived from the original on 2000-08-20. Retrieved 2018-04-28.
  9. ^ "The 28th International Chemical Olympiad (Moscow, 1996)". Archived from the original on 1997-05-26. Retrieved 2018-04-28.
  10. ^ "International Chemistry Olympiad". Archived from the original on 1998-01-24. Retrieved 2018-04-28.
  11. ^ "International Chemistry Olympiad". Archived from the original on 2003-04-14. Retrieved 2018-04-28.
  12. ^ Kanda Nivesanond. "International Chemistry Olympiad 31st". Archived from the original on 2000-08-20. Retrieved 2018-04-28.
  13. ^ Archived from the original on 2006-03-16. Retrieved 2018-04-28. {{cite web}}: Missing or empty |title= (help)
  14. ^ a b "39th INTERNATIONAL CHEMISTRY OLYMPIAD". Retrieved 2018-04-28.
  15. ^ "ICHO 2001 — Homi Bhabha Centre For Science Education, TIFR".
  16. ^ "Results — Homi Bhabha Centre For Science Education, TIFR". 2018-04-10. Retrieved 2018-04-28.
  17. ^ Archived from the original on 2004-06-07. Retrieved 2018-04-28. {{cite web}}: Missing or empty |title= (help)
  18. ^ "34th International Chemistry Olympiad". 2004-06-21. Archived from the original on 2004-06-21. Retrieved 2018-04-28.
  19. ^ "35 ICHO - English Page".
  20. ^
  21. ^ "IPN - Internationale ChemieOlympiade".
  22. ^ "IChO-Ergebnisse nach Ländern.xls" (PDF). Retrieved 2018-04-28.
  23. ^ "Home". Archived from the original on 2013-09-17. Retrieved 2018-04-28.
  24. ^ "Participation". Archived from the original on 2013-07-24. Retrieved 2018-04-28.
  25. ^ "Official site of the 38th IChO, 2006". Archived from the original on 2006-10-26. Retrieved 2005-10-25.
  26. ^ "IChO2006". Archived from the original on 2007-05-22. Retrieved 2018-04-28.
  27. ^ "Official site of the 39th IChO, 2007". Retrieved 2018-04-28.
  28. ^ "Official site of the 40th IChO, 2008". Eötvös Loránd University.
  29. ^ "International Chemistry Olympiad 2009".
  30. ^ "42nd International Chemistry Olympiad".
  31. ^ "43rd International Chemistry Olympiad".
  32. ^ "44th International Chemistry Olympiad".
  33. ^ "45th IChO website".
  34. ^
  35. ^ "46 th International Chemistry Olympiad". Archived from the original on 2013-12-13.
  36. ^ "ICHO 2015".
  37. ^ "IChO-2016".
  38. ^ "IChO 2017 official site". Retrieved 2018-04-28.
  39. ^ "Participating countries : ICHO 2017". Retrieved 2018-04-28.
  40. ^ "Participating countries | IChO 2018".
  41. ^ "IChO 2019 official site". Retrieved 2021-01-26.
  42. ^ "IChO 2020 official site". Retrieved 2021-01-26.
  43. ^ "International Chemistry Olympiad - IChO". Retrieved 2020-04-23.

External links[edit]

Preparatory problems, final results, and the theoretical and practical examinations from particular competition can be found on the respective IChO's website.