This publication contains the competition problems (Volume 2) from the 21-40, international Chemistry Olympiads (ICHO) organized in the years 1989-2008 and is a continuation of the publication that appeared last year as Volume 1 andcontained competition problems from the first twenty whole review of the competition tasks set in the ICHO in its fourty-year history is a contribution of the ICHO International. | 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: Contents Preface . 408 The competition problems of the: 21st ICHO . 410 22nd ICHO . 430 23rd ICHO . 471 24 ICHO . 495 25th ICHO . 524 26th ICHO . 541 27th ICHO . 569 28 th ICHO th . 592 th . 628 th . 671 31 ICHO st . 712 32nd ICHO . 745 33rd ICHO 29 ICHO 30 ICHO . 778 th . 820 th 35 ICHO . 860 36th .
