Khimiya, Volume 14, Issue 2 (2005)
Khimiya. 14, 93-98 (2005):
Abstract. In many
radiochemistry textbooks and courses, the reaction c ® e++e- is usually referred to as a “conversion
(transformation) of the c-ray (i.e. c- photon) into an electron-positron pair”, which is simply incorrect.
Appropriate explanation of the mentioned process should be based on relativistic quantum
mechanics, particularly on Dirac’s theory. Dirac’s theory is, on the other hand,
rather involved those who lack a profound knowledge in relativistic quantum mechanics. The
authors offer a thought experiment as a suitable analogy that helps understand the basis
of the contemporary theory that lies behind the reaction in question.
References: 10
top
Khimiya.
14, 117-124 (2005):
Abstract. Mr. Baramov is a
graduate chemistry student in the University of Sofia. The paper suggests a set of
stoichiometric problems that are appropriate for students in the secondary school. Some of
the problems are solved in detail. The recommendations of SI and IUPAC are carefully taken
into account.
References: 1
top
Khimiya.
14, 125-135 (2005):
Abstract. The
possibilities of the linear-dichroic infrared (IR-LD) spectral analysis about the detailed
assignment of the IR-characteristic bands of the stereo structural characterization of
solid-state compounds are demonstrated on a model system – 4-aminopyridine. The priority
of the illustrated method compared with the conventional IR- spectral methods was also
emphasized.
References: 19
top
Khimiya.
14, 136-145 (2005):
Abstract. The university
teaching in inorganic chemistry in Bulgaria started in 1889 in the founded a year before
Higher Pedagogical School. It is believed that in 1894 the Chair of Inorganic and
Analytical Chemistry is established. In 1924 the Chair was divided into Chair of Inorganic
Chemistry and Chair of Analytical Chemistry. A very short survey of the development of
teaching activities in the Chain of Inorganic Chemistry is presented in the present paper.
References: 8
top
|
