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Year XXII, Issue 2, 2013<<Archive>>

In this issue:

Еducаtion: Thеory & Prаcticе
Nеw Approаchеs
Еxpеrimеnts
Problеms
Forеign Еducаtionаl Trаdition
Advаncеd Sciеncе
Pеrsonаlitiеs in Sciеncе

Еducаtion: Thеory & Prаcticе

ENVIRONMENTAL EDUCATION IN BULGARIA: INTERNATIONAL BACKGROUND AND KEY TRENDS

Content analysis of international and national documents on the state of the environment and environmental education reveals the human efforts to achieve sustainable development through competent management of the relationship with the environment. The paper p...

Zdravka Kostova

global environmental problems, international & national trends

Nеw Approаchеs

REVERSIBILITY AND DEFINITION OF WORK

The article points out a fundamental discrepancy between the definition of work from elementary mechanics, and how the expression for work is developed in most of the courses in chemical thermodynamics. A method of correcting this is suggested. This discrepan...

Jamil Ahmad

thermodynamics, work, reversibility/irreversibility

Еxpеrimеnts

TECHNIQUES OF THE SCHOOL EXPERIMENT IN SCIENCES, FOR BULGARIAN STUDENTS WITH SPECIAL NEEDS

This study discusses the inﬂuence of teaching experiment in the mainstream schools and special schools in Bulgaria. The study presents teaching experiment related to the school subject Man &Nature. This school subject is part of the curriculum both at special...

Milen Zamfirov, Svetoslava Saeva

teaching experiment, Man & Nature, special needs

EXTRACTION-SPECTROPHOTOMETRY OF ION-ASSOCIATION COMPLEXES

Ion-association complexes (IAC) are the basis of various analytical techniques, among which extraction-spectrophotometric are notable by virtue of their simplicity, low-cost instrumentation, high sensitivity and applicability for speciation analysis. In order...

Kiril B. Gavazov

ion-associates, complex compounds, liquid-liquid extraction, equilibrium constants, spectrophotometry, review

Problеms

BALANCING REDOX REACTIONS DEPENDING ON TWO DEGREES OF FREEDOM: INVESTIGATION OF THE DOMAINS FOR SELECTION OF THE INDEPENDENT PARAMETERS

The possibilities for balancing redox reactions depending on two degrees of freedom have been investigated. Similar reactions can be balanced with unlimited sets of non integer stoichiometric coefficients. The pairs of coefficients that can be independent par...

Sashka Petkova, Maria Atanassova, Alexander Zahariev

material balance method, redox reactions, two degrees of freedom, independent parameters

Forеign Еducаtionаl Trаdition

LEARNING ENVIRONMENT OF UNIVERSITY CHEMISTRY CLASSROOMS IN IRAN

In order to study the learning environment of university chemistry classrooms in Iran, Constructivist Learning Environment Survey (CLES) was carefully translated into Persian and administered to 415 (Male =204 and Female=211) Iranian university students. Data...

Zahra Eskandari, Nabi.A Ebrahimi

learning environments research, Constructivist Learning Environment Survey (CLES), Iranian chemistry classrooms, satisfaction

Advаncеd Sciеncе

AGAIN ABOUT THE END OF THE PERIODIC TABLE OF CHEMICAL ELEMENTS

It is a narrative about nuclear syntheses of ﬂerovium and livermorium – presently, the heaviest elements of the Periodic table of the elements. The experiments for determination of chemical properties of ﬂerovium and livermorium are described. On the basis of...

Ivelin Kuleff

ﬂerovium, livermorium, periodic table

Pеrsonаlitiеs in Sciеncе

HRISTO KOSTOV: THE COURSE OF LIFE AND SCIENTIFIC ACTIVITY

Hristo Kostov (1932–1982), assistant professor at the University of Sofia, was a specialist in didactics of physics. He was known as one of the most successful physics teachers in Bulgaria. The building of the astronomical observatory in Belogradchik was his i...

Hristo D. Dimitrov

Hristo Kostov, teaching experiments in physics, Belogradchik high school, astronomical observatory