Volume 14, Issue 5  (2005)

41st National Conference of the Bulgarian Teachers in Chemistry. Part II.	387
Authors: N. Encheva (388); H. Kalpachka, B. Radoev, D. Mitev (395); M. Kirova, E. Boyadjieva (403); G. Kossekova (413); B. Kostadinova, V. Filipova, I. Iliev (421); S. Manev, R. Petkova (428); M. Mitov, Y. Petrov, S. Manev (440); M. Nikolova, S. Iliev (446); M. Nikolova, I. Pastuhov (448); J. Stefanova, M. Minevska (451); A. Tafrova-Grigorova (457); N. Tzankov (464); M. Tsavkova (469); T. Vassilev (472); T. Vassilev (475); T. Vassilev, V. Dimitrova (477); E. Tumbeva (480).
New Approaches:
T. Morikawa, B.T. Newbold. Teaching the Unit 'Radian' as a Physical Quantity	483
Full text: PDF (162 KB)
From the Research Laboratories:
H.R. Pouretedal, A. Semnani. Interaction between Tetrapropylammonium Bromide, Tetraethylammonium Iodide and aza-15-crown-5 with IBr in Chlormethane Solution	488
History and Philosophy of Chemistry:
Education and Curricula in Early Universities: Some Documentary Evidence	499
Full text: PDF (202 KB)
.	.
Khimiya, Volume 14, Issue 5 (2005)  Khimiya. 14, 483-487 (2005):  Abstract. The 'radian' is well known as a troublesome unit in science education. The troubles in student learning originate in the ambiguity of the definition. The note shows that considering the 'dimension' of the radian removes the ambiguity. References: 5 top  Khimiya. 14, 488-498 (2005):  Abstract.  A spectrophotometric and conductometric study, concerning the interaction between, tetrapropylammonium bromide (TPABr), tetraethylammonium iodide (TEAI) and aza-15-crown-5 (A15C5) as n-donor with iodine monobromide (IBr) as -acceptor has been performed in di, tri and tetrachloromethane solutions in 25 C. The results of TPABr are indicative of the formation of TPABr(IBr)2 through equilibrium reactions in CH2Cl2 and CHCl3 solutions and a weak nonequilbrium reaction in CCl4 solution. In the case of TEAI and in CH2Cl2 and CHCl3 solutions, the realization of free iodine and production of TEABr(IBr)2 through two simultaneous equilibria in first step and equilibrium production of TEAI3 in final step are confirmed. Similar to TPABr in CCl4, TEAI shows a weak nonequilibrium interaction with IBr. The stability of TPABr or TEAI charge transfer complexes with IBr vary in the order CH2Cl2>CHCl3>>CCl4. Finally, A15C5 forms [(A15C5)4I+][Br(IBr)3-] in CH2Cl2 and [(A15C5)3I+?Br(IBr)3-] complex in CHCl3 and CCl4 solutions. The stabilities of A15C5-IBr complexes in all of the solvents are nearly equal. References: 21 top  Khimiya. 14, 499- 508 (2005):  Abstract.  Several European documents dating from as early as 13th Century (including laws, papal Bulls, and University records) are cited demonstrating that the importance of the syllabus or organized and planned education was recognized in the earliest Universities. The quoted texts are related to science, mostly medical, education. A collection of laws originating from 8th Century Japan is also cited that sheds light on the methods of education in the Far East. An evidence of planning in medical education and of an early form of "curriculum" in that region is presented. References: 14  top