Методическая разработка по английскому языку для студентов факультета химии и химической технологии " Simple Chemistry" Алматы 2017
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мет. разработка по химии
| Silicon dioxide
Silicon dioxide is a chemical compound. It is an oxide of silicon. Its chemical formula is SiO2. People knew about silicon dioxide in ancient times. People usually find silicon dioxide in nature. They find it in nature in the form of quartz. Silicon dioxide is present in different living organisms. Silicon dioxide is a very complex and abundant material. People produce silicon dioxide synthetically. People also produce silicon dioxide with the help of the processing of quartz. The examples of silicon dioxide include crystals and aerogels. People use silicon dioxide in microelectronics and food industry. People also obtain silicon dioxide with the help of mining. Then they purify the mineral which they mined. The Earth’s crust contains 10 % of quartz. Pyrogenic silica is a colloidal form of silicon dioxide. Chemists prepare it with the help of the burning of SiCl4 in the hydrocarbon flame. At the end of this reaction chemists obtain a "smoke" of SiO2. People use silicon dioxide in the production of glass. People use silicon dioxide when they produce windows, bottles. Silicon dioxide has many crystalline and amorphous forms. Films of silicon dioxide grow very fast. Chemists grow these films with the help of thermal oxidation. When they use thermal oxidation they obtain a very thin layer. Engineers use this layer in microelectronics. In microelectronics this layer plays the role of an insulator. Silicon dioxide is also present in the sand. In medicine people use silicon dioxide in the preparation of tablets. Vocabulary notes silicon dioxide диоксид кремния ancient times древние времена to be present присутствовать to produce получать синтетическим путем crystals кристаллы aerogels аэрогели food industry пищевая промышленность mining добыча месторождений полезных ископаемых to purify очищать to mine добывать the Earth’s crust земная кора pyrogenic silica коллоидальная двуокись кремния, пирогенный кремнезем a colloidal form коллоидная форма to prepare приготовить burning горение, сжигание a hydrocarbon flame углеводородное пламя glass стекло crystalline кристаллический amorphous аморфный a film пленка to grow расти fast быстро thermal oxidation термическое окисление a thin layer тонкий слой an insulator изоляционный материал sand песок жүктеу/скачать 422,31 Kb. Достарыңызбен бөлісу:
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