Icho 43

Problemas Preparatorios

43rd International Chemistry Olympiad

Editor: Saim Özkar
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Department of Chemistry,
Middle East Technical University

Tel +90 312 210 3203, Fax +90 312 210 3200
e-mail icho2011@metu.edu.tr

January 2011
Ankara

Problem Authors

O. Yavuz Ataman
Sezer Aygün
Metin Balcı
Özdemir Doğan
Jale Hacaloğlu
Hüseyin İşçiAhmet M. Önal
İlker Özkan
Saim Özkar
Cihangir Tanyeli

Department of Chemistry, Middle East Technical University, 06531 Ankara, Turkey.

Preface
We have provided this set of problems with the intention of making the preparation for the 43rd International Chemistry Olympiad easier for both students and mentors. We restricted ourselves to the inclusion of only a few topics thatare not usually covered in secondary schools. There are six such advanced topics in theoretical part that we expect the participants to be familiar with. These fields are listed explicitly and their application is demonstrated in the problems. In our experience each of these topics can be introduced to well-prepared students in 2-3 hours. Solutions will be sent to the head mentor of each countryby e-mail on 1st of February 2011. We welcome any comments, corrections or questions about the problems via e-mail to icho2011@metu.edu.tr. Preparatory Problems with Solutions will be on the web in July 2011.
We have enjoyed preparing the problems and we hope that you will also enjoy solving them. We look forward to seeing you in Ankara.
Acknowledgement
I thank all the authors for their time,dedication, and effort. All the authors are Professors in various fields of chemistry at Middle East Technical University. I also thank Dr. Murat Sümbül, Dr. Salih Özçubukçu and Yunus Emre Türkmen for their ideas and valuable contributions regarding the preparatory problems for 43rd IChO. In both preparation and testing of practical problems, we are most grateful to Professor Şahinde Demirciand the laboratory team members, our assistants, Pınar Akay, Seylan Ayan, Derya Çelik, Melek Dinç, Çağatay Dengiz, Zeynep İnci Günler, Tuğba Orhan, Suriye Özlem, Burak Ural, and Emrah Yıldırım.

Ankara, 26 January 2011

Editor

Prof. Dr. Saim Özkar

Contenido
Constantes físicas, símbolos y factores de conversión | 7 |
Temas avanzados | 8 |
Problemas teóricos | 9 |
Problema 1Superácidos | 9 |
Problema 2 Estabilización de iones de metales de transición de alta valencia | 9 |
Problema 3 Colemanita como fuente de boro | 10 |
Problema 4 Compuestos de magnesio | 11 |
Problema 5 Óxidos y oxoaniones de nitrógeno | 13 |
Problema 6 Ferrocromo | 14 |
Problema 7 Compuestos de xenón | 15 |
Problema 8 Estructura de compuestos fosforosos | 16 |
Problema 9 Arsenico enagua | 17 |
Problema 10 Óxidos anfóteros de plomo | 18 |
Problema 11 Análisis de una mezcla de sales de calcio | 19 |
Problema 12 Análisis del aliento | 20 |
Problema 13 Cinética de la descomposición del cloruro de tionilo | 21 |
Problema 14 Reacción reloj | 21 |
Problema 15 Mezcla de gases ideales | 23 |
Problema 16 Cinética en fase gaseosa | 23 |
Problema 17 Equilibrio químico | 24|
Problema 18 Equilibrio de yodo | 25 |
Problema 19 Molecular weight determination by osmometry | 26 |
Problem 20 Allowed energy levels and requirements for absorption of light | 27 |
Problem 21 Rotational and vibrational energy levels of a diatomic molecule | 29 |
Problem 22 Particle in a box: Cyanine dyes and polyenes | 31 |
Problem 23 Radioactive decay | 33 |
Problem 24Enzyme-substrate interaction | 34 |
Problem 25 Amides | 35 |
Problem 26 NMR Spectroscopy | 36 |
Problem 27 Cyclitols | 40 |
Problem 28 Antiviral antibiotic | 42 |
Problem 29 Acyclic -amino acids | 45 |
Problem 30 Life of Ladybug | 47 |
Practical Problems, Safety | 50 |
Problem 31 Preparation of trans-dichlorobis(ethylenediamine)-cobalt(III)chloride and kinetics of its acid hydrolysis...