Санкт-петербургского государственного университета высшее профессиональное образование т. А. Степанова, И. Ю. Ступина
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1stepanova t a english for chemists
| Section Ш
Ex. 1. Think of the situations with the following expressions. Mind the difference in the word-order. Here is the pen. (Вот ручка.) Here it is. (Вот она.) Here are the books. (Вот книги.) Here they are. (Вот они!) Example: — Give me your copy-book, please. (Дай мне тетрадь, пожалуйста.) — Here you are. / Here it is. (Пожалуйста.) Ex. 2. Translate the following questions or requests and react to them. Use expressions from exercise 1. 1. Дай мне, пожалуйста, твою книгу. 2. Где пробирки? 3. Дайте мне, пожалуйста, ваши словари. 4. Где лаборатория общей химии? 5. Ты не знаешь, гае библиотека? б. Поставь, пожалуйста, лампу на этот стол. 7. Дайте мне посмотреть ваши расчеты. 8. А где результаты последнего анализа? 9. Дай мне, пожалуйста, учебник по истории. 10. Покажи мне, пожалуйста, свои перевод. 76 1) seldom, mineral, indium, occur, 0.1 per cent, quantity; 2) form, compound, indium, various, most, be, they, water, soluble; 3) can, ore, several, indium, extract, method; 4) react, indium, nitric acid, reaction, possible, concentrated, two, be, sulphuric acid Ex. 4. Give detailed answers to the following questions: 1. Why wasn’t indium used commercially before 1934? 2. What methods of extracting indium from its ores do you know? 3. What compounds can indium form? 4. In what way docs indium react with acids? 5. What arc the main uses of indium? Ex. 5. Discuss the following topics: 1. The Occurrence of Indium. 2. The Properties o f Indium. 3. The Uses of Indium. DO YOU KNOW THAT... In 1863 Reich and Richtcr, in an eflort to trace thallium in zinc blende observed two new blue lines in the spectrum. The zinc blende had been roasted to remove most of the arsenic and sulphur. The residue had been dissolved with hydrochloric acid and evaporated to dryness. This residue of crude zinc chloridc was submitted to a spectrum analysis. They discovered the new element, indium, so named from its characteristic blue lines. Ex. 3. Макс up sentences or short stories with the following words: жүктеу/скачать 5,96 Mb. Достарыңызбен бөлісу:
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