2011 № 7

To sweep students along by the subject, it is necessary to show the significancy of questions discussed, developing students’ personal and rational attitude towards chemistry. The corresponding tasks examples are offered.

Associate Head of the Legal Department of the Administration of the All-Russian Trade Union of the Education is answering our readers’ questions.

The given article is dedicated to the examination of peculiarities of chemistry reactions of hydrogen radical replacement in alkenes, arenes, and cycloalkanes

While teaching chemistry at the base level to students, a teacher encounter a lot of problems, such as: a necessity to study a great volume of material in condensed deadlines; the lack of time to feedback the material; students’ perplexity and fear in the face of the new information surplus; motivation decrease towards studying chemistry; decreasing the subject academic progress. The author shares the experience of the given problems solving.

At the concluding lessons in the 9th Form students characterize a chemical reaction and all participating in it chemical substances.

While teaching chemistry it is necessary to provide conditions to get a school leaver prepared in a quality manner. The author in one’s practice uses different ways and methods of teaching, the elements of innovative technologies. As an example, the scenario of a doubled lesson on the subject of “Saturated monohydroxy alcohols. Ethanol” is offered.

While studying theme “Saturated monohydroxy alcohols” the author is conducting a lesson about the way alcohol influencing the human organism. It is an integrated lesson, because it is based on the students’ knowledge in the filed of human’s anatomy, chemistry, physiology, and hygiene.

The author provides interesting and cognitive information about water.

It makes sense to conduct many lessons in the 9th Form as the systematizing lessons and feedback of the already obtained knowledge, while adding not a great volume of the new material. As an example, the authors examine the lesson on the subject of “Water”.

While studying the sulphuric acid production it is important to form the idea about the main concepts of the chemical technology with students, to get the students acquainted with the general scientific principles of production process, to develop skills of deciding theoretical and practical chemical tasks with poly-technical content. The author chares the experience of conducting a workshop on the given subject, for the participation in which all students are divided into groups (technologists, ecologists, experts in the filed of local studies, historians).

The authors’ experience of the participation in the Unified State Examination as an expert allows to come to the conclusion, that year in and out while accomplishing chemistry tasks of part 3 student often make mistakes connected with the acid-base and redox matter interacting. The specific examples are given.

We consider the problem of studying chemistry in the pre-university educational institutions in the development of continuing education. The necessity of axiological nature of the educational content that promotes the formation of values to the process of cognition and uses of chemical knowledge. Axiological orientation of teaching chemistry, including pre-university vocational education institutions is realized through the application of humanistic-oriented tasks.

The article is dedicated to the description of the way of establishing the general relations between the physical magnitudes, which describe object properties in the calculatory chemical tasks with the help of specially designed charts. The offered systematization of relations between physical magnitudes facilitates the orientation in the entire abundance of formulas and promotes their comprehensive and quick selection while deciding tasks.

The features of modern teacher's training to teaching of students the solution of chemical are discussed in the article. Basic attention is spared on solving computational problems, the importance of a unified approach to solving and design solutions of chemical problems. The author gives an in dicative list of types of computational tasks, sample planning and part of a lesson to teach students solving problems.

In the 11th For the author gets students acquainted with the usage of the rule of mixing (the cross rule) while deciding calculatory tasks for the solutions. The design of the lesson on the given subject is offered.

At present work technique of formaldehyde oxidation by copper (II) hydroxide was developed which allows clear demonstration of reaction products. Such optimal conditions of reaction as reactant concentrations and temperature were defined. Two options of copper mirror obtaining were described. A method of formaldehyde regeneration from paraformaldehyde solution was proposed.

Explaining about the iron salts, chemistry teacher can not only state their main properties, but also point out the light sensitivity of those compounds. According to our methods, using simple reagents, it is possible to clearly demonstrate the quality reaction in photochemistry. Making cianotypia on the lesson, allows a pupil to become a co-creator and accomplice of a little wonder. Using our methods, we have recorded a movie named "Cianotypia as a case of redoxreactions" http://www.youtube.com/watch?v=1CvOpiAD_G4.

The authors offer to replace the dye-bath in п- or м-xylol with an identical one in carbon tetrachloride. Solidness of this dye-bath solvent is higher, then that of water, that is why the organic layer will be beneath. They note, that carbon tetrachloride is an extremely toxical solvent, therefore you should treat it attentively and carefully, while following the safety regulations.

Today manufacturers offer diverse assortment of sausage products which can be seen on counters of our shops. What sausage is to choose not only qualitative, but also tasty? The purpose of our research was by means of express methods to define the basic indicators of quality of sausage products: a moisture, starch and nitrites and to compare what of the manufacturer offers better and tasty sausage.

It has been known since long time ago, that when concocting concentrated sulphuric acid and water, a strong mixture warming occurs: strong to the extent, that the solution can even begins to boil. But, when concocting sulphuric acid and water, it is possible to receive strong exposure to cold as well. Everything depends on the conditions of process conducting.

In article it is told about participation of domestic scientists-chemists in days of the Fist World War in creation in our country of the chemical industry and formation of army chemical service.

Early atomic models by Jean Perrin and Hantaro Nagaoka are describes.

An integrated post-curriculum exercise in offered, which allows extending students’ knowledge about the creative work of outstanding Russian writer P.P. Bazhov, studying geography of semiprecious stones deposits, getting them acquainted with their chemical composition, demonstrating inter-subject links between chemistry, literature, and geography, and fostering the patriotic feelings.