Khimiya, Volume 15, Issue 5 (2006)
Khimiya, 15, 331-338 (2006)
Abstract. New textbooks for early chemistry
learning have been recently introduced. One of them is the textbook by Bliznakov et al
[2]. Its careful reading shows some disadvantages especially when discussing the topics of
chemical symbols and chemical formulas. Recommendations for improving the text of that,
generally successful, manual, are presented.
Keywords: chemical symbol; chemical
formula; empiric formula; molecular formula
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Khimiya, 15, 339-359 (2006)
Abstract. The paper lists the problems of the
XXXVII International Chemistry Olympiad (16-25 July 2005). The solutions of those problems
are given.
Keywords: International Chemistry
Olympiad; problems with solutions
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Khimiya, 15, 360-377 (2006)
Abstract. Einstein's Special Theory of
Relativity describes the motion of particles moving at close to the speed of light. In
fact, it gives the correct laws of motion for any particle. This does not mean Newton was
wrong; his equations are contained within the relativistic equations. Newton's
"laws" provide a very good approximate form, valid when speed is much less than the speed of light. For
particles moving at slow speeds (very much less than the speed of light), the differences
between Einstein's laws of motion and those derived by Newton are tiny. That's why
relativity doesn't play a large role in everyday life. The paper shows relativity is
important in chemistry and should remember it when we say about heavy element.
Keywords: Heavy Elements,
Relativistic Effects, Relativity in Chemistry
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Khimiya, 15. 378-384 (2006)
Abstract. Mixed ligand cobalt (II) complexes, ( Na2 [{N(CH2COO)3} (C6H5
CO NH CH2 COO)Co]. 6H2O) and (Na2[{N(CH2COO)3}(C6H5
CO NH CH2 COO)Co]) formed with nitrilotriacetic acid and hippuric acid have been synthesized and
characterized for the first time by their elemental analysis , magneto chemical
measurements and spectral studies ( IR and electronic spectra). Nitrilotriacetic acid and
hippuric acid show tetradentate and bidentate behavior respectively. With nitrilotriacetic
acid, the coordination occurs through three carboxylic oxygen atoms and the
nitrogen atom, whereas hippuric acid
coordinates through the oxygen atom of the carboxylic group and the nitrogen atom of the amido
group. Cobalt (II) complexes have been suggested to show six fold octahedral structure
(figure3).
Keywords: synthesis, octahedral Co(II)
complexes, nitrilotriacetic acid, hippuric acid, characterization
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Khimiya, 15, 385-393 (2006)
Abstract. This
is the last part of the complete bibliography of chemistry books published in the period
of the Third Bulgarian Kingdom (1978-1946). Twenty one dissertations for the doctor degree
of the University of Sofia are presented. The procedure of defending a thesis in this
period is described. A concise history of the introduction of the PhD-system in the world
universities is given. The comparison seems to be favorable for the system developed in
the University of Sofia at that time. After all 511 chemistry books had been published in
the Kingdom of Bulgaria. The following areas ate presented: school textbooks – 81 books
(Khimiya, 8, 307-316
(1999));
chemical didactic textbooks and manuals – 44 books (Khimiya, 8,
317-322 (1999); university textbooks – 47 books (Khimiya,
10,
424-438 (2001)); technical and applied chemistry – 146 books (Khimiya, 12,
401—413 (2003)); chemistry for the daily life – 116 books (Khimiya, 13,
397-408
(2004)) and chemistry and warfare – 56 books (Khimiya,
13,
465-474 (2004)).
Keywords:
Kingdom
of Bulgaria;
chemistry books; dissertations
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