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Химия

Publication date: 13.07.2016
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Maria A. Nosova
Anastasia V. Levshina
Svetlana V. Levshina
SBEI lyceum №393 of Kirov district of St. Petersburg , Санкт-Петербург г

«Oxidation-reduction processes in oscillating reaction»

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This article examines the history of discovering and development of oscillating reactions. Oscillating chemical reactions fated to playan important worldview role. These reactions (firstly Belousov-Zhabotinsky reaction) became the examples of complex systems on which natural science is concentrated as such processes are widely spread in the surrounding world. Oscillating reactions are related to catalystic Oxidation-reduction processes. The following research is devoted to investigation of oxidation-reduction processes peculiarities taking place in oscillating reactions.

Publication date: 13.07.2016
Evaluate the material Average score: 5 (Всего: 1)
Ekaterina Y. Oshurkova
Valeriya D. Zaharko
Natalya E. Dubinina , учитель химии
MBEI "Lyceum №22" , Ивановская обл

«Comparing natural and synthetic colorants properties»

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Natural and synthetic pigments have both advantages and disadvantages. It is usually easier and cheaper to isolate the pigment from plants than to synthesize. At the same time, synthetic dyes are more resistant to various environmental factors, which allows to use them widely. The paper examines the influence of high temperature and pH on colour and stability of anthocyanins and phthalocyanine, as well as the benefits of their use.