Year XXII, Issue 4, 2013<<Archive>>
Lеttеrs to thе Еditor
Nеw Approаchеs
RECASTING THE DERIVATION OF THE CLAPEYRON EQUATION INTO A CONCEPTUALLY SIMPLER FORM
The Clapeyron equation specifies the variation of the pressure, \(P\), with respect to the temperature, \(T\), of a closed two-phase one component system at the phase boundary under conditions of thermodynamic equilibrium. Even though in the context of th...
Clapeyron equation, phase equilibria, chemical thermodynamics, molar Gibbs energy, equilibrium thermodynamics
CHEMICAL REACTIONS DO NOT ALWAYS MODERATE CHANGES IN CONCENTRATION OF AN ACTIVE COMPONENT
It is shown in this paper that the use of Le Chatelier’s principle as a Principle of Moderation fails. It is discussed moderation of mole fractions and moderation of molar concentration (molarity) in a reaction of ideal gases. An analysis carried out on therm...
chemical equilibrium, changes in concentration, Le Chatelier’s principle, moderation of molar concentration, moderation of mole fractions.
Curriculum Маttеrs
CRITICAL REMARKS ON THE MATRICULATION EXAM IN GEOGRAPHY IN 2013
The results and quality of questions for school-leaving examination in „Geography and Еconomics“ in Bulgarian secondary school in 2013 are commented. The paper reveals some of the weaknesses of the existing practice of designing of the state tests in geography...
school-leaving examination, matriculation, geography, quiz-making analysis
CONTEMPORARY TRENDS IN THE VOCATIONAL TRAINING OF ENGINEERS
The successful professional realization of the engineers with additional teacher qualification is connected with identification and formation of key, basic, functional and ecological competencies. The article presents the results of an empirical survey with 32...
competences, professional competence, job performance, psychological scaling
Еxpеrimеnts
POLYMETALLIC COMPEXES: CV. SYNTHESIS, SPECTRAL, THERMOGRAVIMETRIC, XRD, MOLECULAR MODELLING AND POTENTIAL ANTIBACTERIAL PROPERTIES OF TETRAMERIC COMPLEXES OF Co(II), Ni(II), Cu(II), Zn(II), Cd(II) AND Hg(II) WITH OCTADENTATE AZODYE LIGANDS
Twelve complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with two octadentate oxygen – nitrogen donor azodye ligands have been prepared. The characterization of the complexes has been made basing upon analytical, conductance, magnetic susceptibili...
polymetallic complexes, tetrameric complexes, azodye complexes
SYNTHESIS AND CHARACTERIZATION OF MIXED LIGAND Cu(II) AND Co(II) COMPLEXES OF L-PHENYLALANINE AND IMINODIACETIC ACID
Mixed ligand complexes, Na[M{(C\(_{6}\)H\(_{5}\) CH\(_{2}\) CH(NH\(_{2}\)) COO)} {NH(CH\({_2}\)COO)\(_{2}\)}.H\(_{2}\)O], where M = Cu(II) and Co(II), formed with phenylalanine and iminodiacetic acid were synthesized and characterized by their elemental anal...
phenylalanine, iminodiacetic acid, \(\operatorname{Cu}\) (II) and \(\operatorname{Co}\) (II) complexes, synthesis, characterization, structure