ON THE USE OF UNIFORM CONCEPTUAL TERMS IN EDUCATION AND LEARNIMG

\(K_{p}\) DOES NOT PLAY THE ROLE OF THE THERMODYNAMIC EQUILIBRIUM CONSTANT, \(\boldsymbol{K}^{\boldsymbol{0}}\) : A DISCUSSED EXAMPLE ON GENERAL CHEMISTRY TEXTBOOKS’ MISREPRESENTATIONS

Equilibrium constants are important quantities when dealing with chemical equilibrium. Many first-year chemistry textbook authors do not define these terms accurately and confusion arises when reporting them. On this regard, this research discusses a common...

WHY SOLIDS AND PURE LIQUIDS ARE NOT PART OF EQUILIBRIUM EXPRESSION

The article deals with the expression of equilibrium constant of a reaction that might include a solid or a pure liquid as a reactant or a product. The typical textbook explanation for excluding terms relating to solids and pure liquid is that their concentrat...

BLENDED LEARNING TASKS FOR TEACHING ENGLISH AS A FOREIGN LANGUAGE METHODOLOGY COURSE (FOR STUDENTS OF BIOLOGY)

The article is dedicated to tasks designed for the discipline <i>Teaching English as a Foreign Language Practice</i> for the binary specialty Biology and English, Faculty of Biology, Sofia University “St. Kliment Ohridski”. The focus is on optimization of...

CONVERSION OF THE TRAINING IN ASTRONOMY INTO A REAL RESEARCH PROCESS – AN INNOVATION IN THE TEACHING PRACTICE

This article describes the principles of a new European educational practice: Inquiry-Based Learning in the astronomy education. We present the results from such education of pupils from the study circle in astronomy of the Public Observatory, Varna. The dis...

SYNTHESIS AND CHARACTERIZATION OF PALLADIUM COMPLEXES OF SOME N, N, N’, N’TETRAKIS(2-PYRIDYLMETHYL) ALKANEDIAMINE LIGANDS

The syntheses and characterization of complexes formed from the reaction of bis(acetonitrile)palladium(II) chloride, (CH\(_{3}\) CN)\(_{2}\) PdCl\(_{2}\) , with nitrogenbased ligands of the type N,N,N´,N´-tetrakis(2-pyridylmethyl)alkanediamine {alkane= but...

A NEW APPROACH FOR THE SYNTHESIS OF P-ANISYL ETHYL FUMARATE: A C-9154 ANTIBIOTIC ANALOGUE

A simple, energy-efficient, and relatively quick synthetic procedure for the synthesis of p-anisyl ethyl fumarate from p-anisaldehyde has been carried out. The synthesis was started by solvent-free reduction of the aldehyde using sodium borohydrate. The se...

DDT – THE SUBSTANCE WHICH WAS CONSIDERED AS SALVATION AND TODAY IT CAN BE FOUND IN THE LIST OF FORBIDDEN FOR USING SUBSTANCES

The history of discovery of DDT (dichlorodiphenyltrichloroetha ne) is described in the present article. The insecticide DDT was broadly used in agriculture, medicine and human life. However, in our days, this substance is in the list of forbidden for using s...

THE EFFECT OF KOH AND KCL ADDITION TO THE DESTILATION OF ETHANOL-WATER MIXTURE

This paper discuss the addition of KOH and KCl to the destilation of ethanol-water mixture. The investigation were on the azeotrope point in destilation curve, the yield of ethanol as the destilation product, and also on colligative and thermodynamic propert...

PROF. WIDEN TABAKOFF – A COURSE OF LIFE AND SCIENTIFIC ACHIEVEMENTS

This paper is in commemoration of the recently passed away prof. Widen Tabakoff (1919 – 2015), USA. Widen Tabakoff was born in 1919 in Stakevtsi, near Belogradchik, Bulgaria. He was a famous airspace engineer and researcher who participated in NASA program...

THE FIRST YEARS OF PHYSICAL CHEMISTRY IN BULGARIA

The famous Bulgarian physicochemical school of Stranski, Kaishev and their associates and disciples has been developing on the basis of the Department of Physical Chemistry at Sofia University “St. Kliment Ohridski “. This University unit was occupied by Dr....

TEACHERS IN LEARNING WITH USING OF INFORMATION AND COMMUNICATION TECHNOLOGIES

In the article is presented author‘s viewpoint about the functions and activities of teachers in learning with using information and communication technologies. The results of a proper educational experiment on this topic are presented.