TEACHING THE CONSTITUTION OF MATTER

ENCOURAGING HIGHER LEVEL QUESTIONING BY THE USE OF TEACHING TECHNOLOGY

Aiming to analyze learners’participation and their readiness to formulate higher level questions under the influence of the teaching technology, a research was conducted in the subject of civic education. Research population sample comprised 126 pupils and the...

BLOOD CLOTTING

This paper provides a detailed review of hemostasis and blood coagulation. Hemostasis can be divided into four general phases: the vascular phase, endotheliumthrombocyte phase, the coagulation cascade phase and the fibrinolytic phase. The mechanisms involved i...

CATALITIC VOLCANO\(^{1)}\)

The lecture demonstration of the decomposition of H2O2 in the presence of Mn(IV) oxide with a proof of the products of the reaction is presented in an entertaining way with the smoking and shrinking water bottle. Designed are several three minutes reaction ti...

SECONDARY SCHOOL GRADUATION IN BULGARIA: CHEMISTRY EXAMS (2008-2011)

This article presents the results of school-leaving examination in Bulgarian secondary school in the subject “Chemistry and Environment”. The data commented cover the period 2008 – 2011. The paper reveals several difficulties and problems in the existing pract...

43^RD INTERNATIONAL CHEMISTRY OLYMPIAD

The paper represents problems (theoretical and practical) of the 43^rd International Chemistry Olympiad and the solutions of theoretical problems. Comments of Bulgarian team presentation are given.

NEW VERY HARD PROBLEMS OF BALANCING CHEMICAL REACTIONS

In this article are balanced two new very hard chemical reactions which possess atoms with fractional oxidation numbers. Considered chemical reactions belong to the class of chemical reactions which have unique coefficients. These reactions are balanced by the...

THE 50TH ANNIVERSARY OF SEMICONDUCTOR LАSER

Pioneering developments which are related to the invention of laser, including semiconductor laser, 50 years ago are amongst of the most important scientific achievements of the twentieth century. They still have a significant influence on the technical progres...

JUBILEE: PROF. DR. BORIS GALABOV

PROFESSOR IWAN NIKOLOV STRANSKI – THE FORGOTTEN GENIUS?

Bulgaria has made a significant contribution to world science. Among the biggest Bulgarian scientific achievements is the creation of the theory of crystal growth and the development of Bulgarian physico-chemical scientific school. The article presents the li...

ПЪРВИЯТ ПРАВИЛНИК ЗА УЧЕБНИЦИТЕ (1897 Г.)

JOHN DEWEY: HOW WE THINK (1910)¹⁾

ИНФОРМАЦИЯ ЗА СПЕЦИАЛНОСТИТЕ В ОБЛАСТТА НА ПРИРОДНИТЕ НАУКИ В СОФИЙСКИЯ УНИВЕРСИТЕТ „СВ. КЛИМЕНТ ОХРИДСКИ“. БИОЛОГИЧЕСКИ ФАКУЛТЕТ