THE COMPETITION PROBLEMS FROM THE
INTERNATIONAL CHEMISTRY OLYMPIADS
Volume 2
21st – 40th IChO
1989 – 2008
Edited by Anton Sirota
IUVENTA, Bratislava, 2009
,THE COMPETITION PROBLEMS FROM THE INTERNATIONAL CHEMISTRY OLYMPIADS,
Volume 2
st th
21 – 40 IChO (1989 – 2008)
Editor: Anton Sirota
ISBN 978-80-8072-092-6
Copyright © 2009 by IUVENTA – IChO International Information Centre, Bratislava, Slovakia
You are free to copy, distribute, transmit or adapt this publication or its parts for unlimited teaching purposes,
however, you are obliged to attribute your copies, transmissions or adaptations with a reference to "The
Competition Problems from the International Chemistry Olympiads, Volume 2" as it is required in the
chemical literature. The above conditions can be waived if you get permission from the copyright holder.
Issued by IUVENTA in 2009
with the financial support of the Ministry of Education of the Slovak Republic
Number of copies: 250
Not for sale.
International Chemistry Olympiad
International Information Centre
IUVENTA
Búdková 2
811 04 Bratislava 1, Slovakia
Phone: +421-907-473367
Fax: +421-2-59296123
E-mail:
Web: www.icho.sk
,Contents
Preface ............................. 406
VOLUME 2
The competition problems of the:
st
21 IChO ............................. 408
22nd IChO ............................. 428
23rd IChO ............................. 469
24th IChO ............................. 493
th
25 IChO ............................. 522
26th IChO ............................. 539
27th IChO ............................. 567
28 th IChO ............................. 590
29th IChO ............................. 626
th
30 IChO ............................. 669
st
31 IChO ............................. 710
nd
32 IChO ............................. 743
33rd IChO ............................. 776
34th IChO ............................. 818
th
35 IChO ............................. 858
th
36 IChO ............................. 903
37th IChO ............................. 955
38th IChO ............................. 996
39th IChO ............................. 1039
40th IChO ............................. 1096
Quantities and their units used in this publication ................ 1137
, Preface
This publication contains the competition problems (Volume 2) from the 21st – 40th
International Chemistry Olympiads (IChO) organized in the years 1989 – 2008 and is a
continuation of the publication that appeared last year as Volume 1 and contained
competition problems from the first twenty IChOs. The whole review of the competition
tasks set in the IChO in its fourty-year history is a contribution of the IChO International
Information Centre in Bratislava (Slovakia) to the development of this world known
international competition. This Volume 2 contains 154 theoretical and 46 practical
competition problems from the mentioned years. The review as a whole presents
altogether 279 theoretical and 96 practical problems.
In the elaboration of this collection the editor had to face certain difficulties because
the aim was not only to make use of past recordings but also to give them such a form
that they may be used in practice and further chemical education. Consequently, it was
necessary to make some corrections in order to unify the form of the problems. However,
they did not concern the contents and language of the problems.
Unfortunately, the authors of the particular competition problems are not known and
due to the procedure of the creation of the IChO competition problems, it is impossible to
assign any author's name to a particular problem. As the editor I would appreciate many
times some discussion with the authors about any critical places that occurred in the text.
On the other hand, any additional amendments to the text would be not correct from the
historical point of view. Therefore, responsibility for the scientific content and language of
the problems lies exclusively with the organizers of the particular International Chemistry
Olympiads.
Some parts of texts, especially those gained as scanned materials, could not be
used directly and thus, several texts, schemes and pictures had to be re-written or created
again. Some solutions were often available in a brief form and necessary extent only, just
for the needs of members of the International Jury.
Recalculations of the solutions were made in some special cases only when the
numeric results in the original solutions showed to be obviously not correct. Although the
numbers of significant figures in the results of several solutions do not obey the criteria
generally accepted, they were left without change.
INTERNATIONAL CHEMISTRY OLYMPIADS
Volume 2
21st – 40th IChO
1989 – 2008
Edited by Anton Sirota
IUVENTA, Bratislava, 2009
,THE COMPETITION PROBLEMS FROM THE INTERNATIONAL CHEMISTRY OLYMPIADS,
Volume 2
st th
21 – 40 IChO (1989 – 2008)
Editor: Anton Sirota
ISBN 978-80-8072-092-6
Copyright © 2009 by IUVENTA – IChO International Information Centre, Bratislava, Slovakia
You are free to copy, distribute, transmit or adapt this publication or its parts for unlimited teaching purposes,
however, you are obliged to attribute your copies, transmissions or adaptations with a reference to "The
Competition Problems from the International Chemistry Olympiads, Volume 2" as it is required in the
chemical literature. The above conditions can be waived if you get permission from the copyright holder.
Issued by IUVENTA in 2009
with the financial support of the Ministry of Education of the Slovak Republic
Number of copies: 250
Not for sale.
International Chemistry Olympiad
International Information Centre
IUVENTA
Búdková 2
811 04 Bratislava 1, Slovakia
Phone: +421-907-473367
Fax: +421-2-59296123
E-mail:
Web: www.icho.sk
,Contents
Preface ............................. 406
VOLUME 2
The competition problems of the:
st
21 IChO ............................. 408
22nd IChO ............................. 428
23rd IChO ............................. 469
24th IChO ............................. 493
th
25 IChO ............................. 522
26th IChO ............................. 539
27th IChO ............................. 567
28 th IChO ............................. 590
29th IChO ............................. 626
th
30 IChO ............................. 669
st
31 IChO ............................. 710
nd
32 IChO ............................. 743
33rd IChO ............................. 776
34th IChO ............................. 818
th
35 IChO ............................. 858
th
36 IChO ............................. 903
37th IChO ............................. 955
38th IChO ............................. 996
39th IChO ............................. 1039
40th IChO ............................. 1096
Quantities and their units used in this publication ................ 1137
, Preface
This publication contains the competition problems (Volume 2) from the 21st – 40th
International Chemistry Olympiads (IChO) organized in the years 1989 – 2008 and is a
continuation of the publication that appeared last year as Volume 1 and contained
competition problems from the first twenty IChOs. The whole review of the competition
tasks set in the IChO in its fourty-year history is a contribution of the IChO International
Information Centre in Bratislava (Slovakia) to the development of this world known
international competition. This Volume 2 contains 154 theoretical and 46 practical
competition problems from the mentioned years. The review as a whole presents
altogether 279 theoretical and 96 practical problems.
In the elaboration of this collection the editor had to face certain difficulties because
the aim was not only to make use of past recordings but also to give them such a form
that they may be used in practice and further chemical education. Consequently, it was
necessary to make some corrections in order to unify the form of the problems. However,
they did not concern the contents and language of the problems.
Unfortunately, the authors of the particular competition problems are not known and
due to the procedure of the creation of the IChO competition problems, it is impossible to
assign any author's name to a particular problem. As the editor I would appreciate many
times some discussion with the authors about any critical places that occurred in the text.
On the other hand, any additional amendments to the text would be not correct from the
historical point of view. Therefore, responsibility for the scientific content and language of
the problems lies exclusively with the organizers of the particular International Chemistry
Olympiads.
Some parts of texts, especially those gained as scanned materials, could not be
used directly and thus, several texts, schemes and pictures had to be re-written or created
again. Some solutions were often available in a brief form and necessary extent only, just
for the needs of members of the International Jury.
Recalculations of the solutions were made in some special cases only when the
numeric results in the original solutions showed to be obviously not correct. Although the
numbers of significant figures in the results of several solutions do not obey the criteria
generally accepted, they were left without change.
