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Volume 21, Issue 3  (2012)

Education: Theory & Practice:
N. Tzankov
Cognitive-and-Educational Assignments for Forming and Developing Modeling Competence in Chemistry and Environment Education [In Bulgarian]

Full text: PDF (1042 K)

327
New Approaches:
M. Karakas
Teaching Intermolecular Forces with Love Analogy: A Case Study

Full text: PDF (721 K)

341
Curriculum Matters:
N. Tzanova, N. Raitcheva
Professional Profile and Standards for the Teacher in Biology [In Bulgarian]

Full text: PDF (1295 K)

349
Teaching Efficiency:
M. Zamphirov
On the External Evaluation of Teaching and Learning in "Man and Nature" - 4th Grade: Special Schools for Blind and Deaf Students in Bulgaria [In Bulgarian]

Full text: PDF (967 K)

364
A. Tafrova-Grigorova, M. Kirova, E. Boiadjieva
Science Teachers' Views on the Constructivist Learning Environment in the Bulgarian School [In Bulgarian]

Full text: PDF (1323 K)

375
Experiments:
O.S. Bello, M.A. Ahmad
Preparation and Characterization of Activated Carbon Derived from Rubber Seed Coat

Full text: PDF (1453 K)

389
Z.K. Hristov
Method of Measuring of Sun Time with a Cylindical Sundial [In Bulgarian]

Full text: PDF (2902 K)

396
Bulgarian Educational Tradition:
L. Genkova, S. Beneva
To Enhance Interest of the Pupils to Chemistry and Chemistry Education [In Bulgarian]

Full text: PDF (1610 K)

405
M. Nikolova
The Beginning of Chemistry Education in Aprilov School in Gabrovo [In Bulgarian]

Full text: PDF (2520 K)

418
From the Research Laboratories:
B. Adinew
Textile Effluent Treatment and Decolorization Techniques - A Review

Full text: PDF (845 K)

434
Personalities in Science:
M. Kirova
Jubilee: Doc. Zdravka Malcheva [In Bulgarian]

Full text: PDF (1075 K)

457
Reviews:
B.V. Toshev
Constructivism: Theory and Practice [In Bulgarian]

Full text: PDF (896 K)

463
Archives:

Science Education in Bulgaria - Photoarchives

Full text: PDF (4712 K)

469
 

Khimiya, Volume 21, Issue 3(2012)

Khimiya. 21, 327- (2012) Author(s): N. Tzankov:

Abstract.Educational-and-cognitive assignments are a main means for forming a competence for educational-and-cognitive modeling in the high-school level of education. The school subject ???Chemistry and Environment??? allows the systematic and purposeful forming and developing of this type of competence. This article represents the main types of educational-and-cognitive assignments in the technology of forming and developing of the competence for educational-and-cognitive modeling in the subject in question.

Keywords: competence for cognitive modeling, educational-and-cognitive assignments, Chemistry & Environment teaching/learning

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Khimiya. 21, 341- (2012) Author(s): M. Karakas:

Abstract.This paper provides an example of an innovative science teaching applied in an introductory chemistry course for future elementary teachers at a small university in northeastern Turkey. The aim of the lesson is to help prospective elementary teachers understand the intermolecular forces in a simple way and see an innovative teaching example.

Keywords: intermolecular forces, chemistry education, introductory chemistry, innovative teaching, analogies in chemistry

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Khimiya. 21, 349- (2012) Author(s): N. Tzanova, N. Raitcheva:

Abstract.Development of modern society is marked by unlimited opportunities in communication, unification of priorities, expectations, influences and interactions on a global scale. Immanent part of changes is also in processes in education as an integral part of dynamic society, driving at united educational area in priorities and expectations. Presence in common educational frame supposes consensus in goals to reach identical results. This article comments the contemporary aspects of educational system and European educational area as normative base for unity as a concept. Model of professional-situational stage of personal expression and model of expert teacher in levels, aspects to regulate them normatively are shown. This is a base to deduce accent in content ??? standards, as basic element in model of preparation, in professional direction pedagogy in teaching biology.

Keywords: model of expert teacher, standards, biology education

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Khimiya. 21, 364- (2012) Author(s): M. Zamphirov:

Abstract.This article discusses data obtained from the external evaluation of the school subject ???Man & Nature??? for 4th grade blind and deaf students in Bulgaria. Special attention is given to students from three schools for pupils with special needs, those in Sofia, Plovdiv and Targovishte.

Keywords: external assessment, special schools, early science education, ???Man & Nature???

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Khimiya. 21, 375- (2012) Author(s): A. Tafrova-Grigorova, M. Kirova, E. Boiadjieva:

Abstract.A survey of 30 teachers from 28 schools of different type and different Bulgarian regions is carried out. A Bulgarian version of the Constructivist Learning Environment Survey (CLES) has been used to study science teachers??? views on the constructivist learning environment, and their attitudes and preferences to the ways of teaching science in class. Teachers consider the present learning environment as a constructivist one but still keeping some features of the traditional classroom. They prefer definitely an environment committed to constructivist practices.

Keywords: constructivist learning environment, science teachers, CLES

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Khimiya. 21, 389- (2012) Author(s): O.S. Bello, M.A. Ahmad:

Abstract.Activated carbon was prepared from rubber seed coat (RSCAC). It was characterized using Fourier Transform Infrared (FTIR), Thermo gravimetric analysis (TGA), Braunauer Emmett Teller (BET), Scanning Electron Microscopy (SEM), Elemental Analysis (EA), pHpzc and Boehmn titrations. The pore size of the adsorbent prepared lies in the mesopore region, it possess other characteristics similar to conventional commercial activated carbon (CAC). The study shows that rubber seed coat (RSC) is a good precursor that could be used in the preparation of activated carbon.

Keywords: rubber seed coat, activated carbon, mesopore, effluents

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Khimiya. 21, 396- (2012) Author(s): Z.K. Hristov:

Abstract.A method of measuring the average sun time with a cylindrical sundial is presented in this article. The innovation represents the use of a gnomon???memory system, which has a numerical register consisting of information about the time addition necessary for the average sun time to be determined. This information can be found on the register using a moving, opaque, output point (a top of a pointer) and its shadow.

Keywords: sundial, gnomon, equation of time, zone time, local time

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Khimiya. 21, 405- (2012) Author(s): L. Genkova, S. Beneva:

Abstract.The paper reviews in brief the development of chemistry and chemistry education during the centuries. The historic approach in chemistry education proved its power as an effective tool for promoting and keeping the interest of pupils to both chemistry science and chemistry learning. Different out-of-school forms could be used to realize that aim. A review of literature on the topic is presented.

Keywords: Bulgaria, history of chemistry, history of chemical education, enhancing interest to chemistry, history approach

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Khimiya. 21, 418- (2012) Author(s): M. Nikolova:

Abstract.The present study aims at specifying the historical period during which chemistry began to be taught as a separate school subject in the First new Bulgarian school in Gabrovo. The research covers the first syllabi from 1872 designed for teaching at school by Raitcho Karolev and Ivan Gyuzelev. A comparison has been made between programs used 25 years later including the high scientific level and volume of knowledge that were taught in the high school in the end of XIX century. It has been made a review of existing data for handbooks and textbooks used for the school training between 1872 and 1899. It has also been mentioned that at the outset chemistry teaching has been related to the experimental nature of the science where for teaching purposes the school was equipped with an incomplete chemical laboratory which by 1896 turned to a well-equipped one. The historical review lists also some of the teachers who taught chemistry in the Main boys??? class school in Gabrovo by the end of XIX century. The study also provides relatively complete information about Tsani Gintchev ??? the first chemistry teacher at Aprilov School, Georgi Smilov and Nikola Bizhev.

Keywords: chemical education, history, school syllabi, teacher

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Khimiya. 21, 434- (2012) Author(s): B. Adinew:

Abstract.Dyes and pigments are widely used, mostly in the textile, paper, plastics, leathers, food and cosmetics industry to color products. Textile industry consumes large volume of water and produce large amount of wastewater during all phases of textile production and finishing. The release of colored effluents represents a serious green pollution and a human health concern particularly in developing countries like Ethiopia (East Africa). Color removal, especially from textile effluents, has gargantuan challenge over the last decades, and up to now there is no single and cost-effectively attractive treatment that can effectively decolourise as well as treat the dyes effluents. The objective of this review article is to discuss a variety of textile wastewater treatment techniques (physical, chemical and biological techniques) from the environmental point of view.

Keywords: textile effluent, color removal, adsorption, green pollution, dyes

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Khimiya. 21, 463- (2012) Author(s): B.V. Toshev:

Abstract.Pelech and Pieper present the fundamentals of constructivism emphasizing on its applications in school practice. Their recent book (2010) is structured in 16 chapters and amongst them are: principles of constructivism, creating a constructivist environment, delivering constructivism through problem-solving learning, metacognition, reflection and constructivism, professional resources for the constructivist teacher.

Keywords: constructivism, constructivist environment, reflection, constructivist teacher

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