Khimiya, Volume 15, Issue 6 (2006)
Khimiya, 15, 411-414 (2006)
Keywords: early
science education, integral vs. module teaching
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Khimiya, 15, 417-425 (2006)
Abstract. Calorimetry has found value in the study of
thermodynamics of reactive systems, mixtures and materials. To appreciate the usefulness
of calorimetry it is important to recognise the principles of thermodynamics upon which it
is based. An account of the development of thermodynamics in a calorimetric experiment is
presented to quantify hypochlorite in commercial household laundry bleach using a
titration type procedure to reach the endpoint. Heat, heat capacities and heat of reaction
are determined by measuring energy changes from temperature in an adiabatic calorimeter
Keywords: thermochemistry,
calorimetry, thermometric titration, hypochlorite
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Khimiya, 15, 426-430 (2006)
Abstract.
Both surface tension and viscosity data of aqueous solutions of the deoxy adenosine (DOA)
and the deoxy ribose (DOR) sugar along with aqueous PVP-oxime silico alanine have been
measured with survismeter with a striking agreement with literature data. These functions
in general are being measured with stalagmometer and viscometer respectively consuming
much effort, chemicals, and solvents but the individual measurements are more time- and
materials consuming.
Keywords:
surface tension, viscosity, survismeter, viscous flow
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Khimiya, 15. 431-447 (2006)
Abstract. On 3-5 February 2006 a National
Chemistry Competition – Vratsa 2006 was held. 75 students from different Bulgarian
schools participated in the rivalry. Four problems from Inorganic Chemistry and as well as
Organic Chemistry were given. This competition is similar to the entrance exam in
Chemistry for the prospective students of both Medical University – Sofia and Medical University
– Varna. A careful analysis of the problems given is presented. The system of pupils’
evaluation is described.
Keywords: chemistry competition, university
entrance exam, problems
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Khimiya, 15, 448-468 (2006)
Abstract. The first paper marking the birth of the
neutron activation analysis was published in 1936. The present paper draws attention to
the 70th anniversary of this event representing the physical background of the
neutron activation analysis, the method of work, the possibility and limits of that
analytical method as well as some information about the history of discovering of the
activation analysis. Additionally some information about the possible application of the
neutron activation method of analysis is given. As appendix of the paper short notes about
some of the mentioned in the paper names of famous scientists are presented, these had
been working in the field of radioactivity and through this had contributed to the
discovery of the neutron activation analysis.
Keywords:
NAA
– neutron activation analysis, principles of NAA, nuclear reactions with neutrons,
application of NAA, radioactivity
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Khimiya, 15, 469-481 (2006)
Abstract. Hopefully all the papers in the field of
History and Philosophy of Chemistry (HPC), published in 2005, are listed in the present
bibliography. This reference list contains 148 articles published in 33 scholarly
journals. A list of 45 academic journals, open for such kind of articles, is presented.
Keywords: history and philosophy of chemistry,
bibliography
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