THE CALENDAR: OLD STYLE AND NEW ONE

BEEKEEPING CLUB AT SCHOOL

DIFFERENTIAL TEACHING IN SCHOOL SCIENCE EDUCATION: CONCEPTUAL PRINCIPLES

School reflects needs of society which change in the course of time. Therefore, a new shaping of both teaching and bringing up of individuality should be realized. Conceptual approach strengthens necessity of essential perfection of content and meaning of the d...

KINETIC THEORY OF THE IDEAL GAS: DERIVATION OF THE LAW OF MAXWELL AND BAROMETRIC FORMULA FROM THE KINETIC EQUATION OF BOLTZMANN

The rigorous theory of ideal gas leads to the Boltzmann kinetic equation. For a system in thermodynamic equilibrium, with no external field, this equation transforms into the Maxwell velocity distribution law for the gas molecules. Is this law holds for a syst...

STUDY OF PUPILS’ PERFORMANCES (SIXTH GRADE) ON SECTION „SUBSTANCES AND THEIR PROPERTIES“ IN THE SUBJECT „MAN AND NATURE“

This article presents the results from assessing students’ performances in „Man & Nature“ (6th grade), in the part related to substances and their transformations. The study was conducted with 1010 sixth graders from various schools on the territory of Lovech...

INTERACTION OF IRON WITH NITRIC ACID: A COMPLEX REDOX REACTION

The interaction of Fe with HNO\(_{3}\) of various concentrations causes the production of several products result of HNO\(_{3}\) reduction. That’s why the reaction depends on several independent parameters and can be balanced with unlimited sets of non integer...

THEORETICAL INVESTIGATION ON THE CHOICE OF INDEPENDENT PARAMETERS FOR REDOX REACTIONS BALANCING WITH MORE THAN ONE DEGREE OF FREEDOM

An algorithm and program permitting to balance redox reactions with arbitrary number of degrees of freedom and determination of positive values of the coefficients of linear combination of independent parameters are proposed. This approach gives possibility to...

PSYCHOSOCIAL ENVIRONMENT OF CHEMISTRY LABORATORY CLASSROOMS IN IRANIAN HIGH SCHOOLS

This study investigates the learning environment of chemistry laboratory classrooms in Iranian high schools. Science Laboratory Environment Inventory (SLEI) was carefully translated into Persian and administered to 748 (M= 325 and F=423) Iranian high school st...

DENSITY FUNCTIONAL THEORY OF THE EFFICIENCIES OF 2-PHENYLIMIDAZO[1,2-A]PYRIDINE AND 2-(M-METHOXYPHENYL)IMIDAZO[1,2-A] PYRIMIDINE AS CORROSION INHIBITORS FOR MILD STEEL

Density Functional Theory (DFT) method was used to study the corrosion inhibition characteristics of 2-phenylimidazo[1,2-a]pyridine (2PIP) and 2-(m-methoxyphenyl)imidazo[1,2-a]pyrimidine (2MPIP) on mild steel. Quantum chemical parameters such as highest occup...

TEACHING SOCIAL SCIENCES IN THE BULGARIAN SCHOOLS FOR GIRLS (1897): MORALITY

HISTORY AND PHILOSOPHY OF SCIENCE: SOME RECENT PERIODICALS (2013)¹⁾

45. НАЦИОНАЛНА КОНФЕРЕНЦИЯ НА УЧИТЕЛИТЕ ПО ХИМИЯ