CHEMOMETRIC ANALYSIS OF SCHOOL LIFE IN VARNA

In this paper, the authors’ collective is presenting a questionnaire, designed and tested by them for the regular evaluation of the educational environment in high schools. It consists of 50 multiple choice questions about quality of learning and relations b...

THE ATTITUDES OF 13 – 14-YEAR-OLD STUDENTS TOWARDS SCIENCES IN NON-FORMAL EDUCATION

This paper presents the results and their analysis of a recent attitude questionnaire, intended to measure the attitude of 13 – 14-year-old students towards science in non-formal educational framework. The questionnaire was filled out by students, participa...

AN ANALYTICAL EXPERIMENT USING BEER’S LAW FOR A MIXTURE OF TWO DYES

This is a short communication of an inexpensive and safe experiment used in Analytical Chemistry. The experiment uses the idea of Beer’s law from a Freshman Chemistry Laboratory course for one material, where the absorption of light changes with the amount o...

SYNTHESIS OF POLY(TETRAHYDROFURAN-CO-EPICHLOROHYDRIN) USING AN ECOLOGIC CATALYST MONTMORILLONITE (MAGHNITE-H+)

The copolymerization of Tetrahydrofuran (THF) with Epichlorohydrin (ECH) catalyzed by efficient and environmentally friendly catalyst called Maghnite-H+ was investigated , in the presence of a natural Algerian montmorillonite clay modified H2SO4 , known as...

CONSTRUCTION OF JOB’S PLOT IN CASE OF HIGH SPECTRAL OVERLAP BETWEEN THEREACTANTSANDTHECOMPLEX:APPLICATION OF MULTIWAVELENGTH LINEAR REGRESSION ANALYSIS USING THE CU-EDTA SYSTEM

Job’s method is extensively used to determine the stoichiometry of complex ions both in the field of education and research. However, the shape of the Job’s plot generally does not match to what is shown in the textbooks due to simultaneous absorption by oth...

A NEW EASY METHOD FOR ASSIGNING ABSOLUTE CONFIGURATION WITHOUT THE USE OF MODELS

Four rules of thumb were developed to find the absolute configuration of a molecule without using any stereo model or hand analogies. This method will be a boon for students who are unable to visualize a three-dimensional structure or any model. A maximum thi...

EQUATIONS USED IN INTRODUCTION OF THE CONCEPT OF RESTING MEMBRANE POTENTIAL IN MODERN TEXTBOOKS OF HUMAN PHYSIOLOGY: TRADITIONS AND ALTERNATIVES

In the system of medical education physiology is a discipline of key importance based on very dynamic field of scientific knowledge. Permanent emergence and accumulation of new facts and concepts make teaching of physiology challenging task where success and...

SPECTRAL, BIOLOGICAL, MAGNETIC AND CONDUCTANCE STUDIES ON THE COORDINATION COMPOUNDS OFANEWLY SYNTHESIZED THIAZOLIDIN-4-ONE

A dry benzene solution of the Schiff base, N-(2-hydroxyphenyl)3‘-carboxy-2‘-hydroxybenzylideneimine upon reacting with mercaptoacetic acid undergoes cyclization and forms N-(2-hydroxyphenyl)-C-(3‘-carboxy-2‘-hydroxyphenyl) thiazolidin-4-one, LH3(I). A MeOH...

THE CYCLES OF KREBS

In the present paper the idea about the cycles discovered by Dr. Hans Krebs is given. The career of Dr Krebs in Germany and England is outlined and his cycles are described in details. It is given also the evaluation of his discovery both about life and deve...

FROM THE PRINCIPLE OF LEAST ACTION TO THE CONSERVATION OF QUANTUM INFORMATION IN CHEMISTRY: CAN ONE GENERALIZE THE PERIODIC TABLE?

In fact, the first law of conservation (that of mass) was found in chemistry and generalized to the conservation of energy in physics by means of Einstein’s famous “E=mc\(^{2}\)”. Energy conservation is implied by the principle of least action from a variat...

POST STAMP DEDICATED TO THE PERIODIC TABLE OF MENDELEEV

INTERDISCIPLINARY INTEGRATION IN SECONDARY SCHOOL