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on, by, of, in, with, between, to, out, at, in order to, fo r
1. The mass... hydrogen is the unit... measurement... the masses ...
other elements. 2. The committee set the atomic weight ... oxygen ...
16.000 to make the atomic weights ... other elements comc ... closer ...
whole numbers. 3. Hydrogen was given the weight... 1.008.4. Hydrogen
was obtained ... 1766 ... Henry Cavendish ... London. 5. Cavendish
obtained ... hydrogen... dissolving... zinc, iron or tin ... diluted H2S04 or HC1.6. Cavendish was impressed ... the lightness... the gas. 7. The name “hydrogen” was given ... Lavoisier. 8. Hydrogen exists ... three isotopic forms. 9. There arc slight differences ... the properties ... ordinary water and heavy water. 10. Hydrogen is one... the most abundant elements... the earth. 11. Hydrogen combines ... other elements and forms different kinds
... compounds. 12. Some ... the hydrogen compounds ionize ... solution.
Hydrogen is usually obtained ... action... sulphuric acid ... zinc. Ex. 9. a) Fill in the blanks with some, any, no.
There is ... acid in this glass. 2. Have... more tea, will you? 3. Will you give me ... books now? 4. Sony, but I have ... pen here. 5. Have ...
students comc already? 6. They haven’t read ... texts yet. 7. Arc there...
books on your tabic? 8. Is there ... difference between oxidation and combustion? 9. There is ... gas in this container, it has escaped. 10. She has ... work to do in the evening.
b) Put the sentences into interrogative and negative forms, give short answers to the obtained questions.
1. There arc some students in the room. 2. There arc some mistakes in his test-paper. 3. There arc some books on the table. 4. There is some information on this proccss. 5. There is some oxygen in the tube. 6. There arc some interesting articles in this journal.
Ex. 10. Translate the sentences into Russian; say what the predicatives are expressed by.
1. Hydrogen is the lightest chcmical element. 2. The mass of hydrogen is the unit of measurement for the masses of other elements. 3. The atomic weights of the other elements arc almost whole numbers. 4. The atomic weight of oxygen is 16.000. 5. Tritium is radioactive. 6. The formula of heavy water is D20 . 7. Hydrogen is one of the most abundant elements on the earth. 8. In general hydrides are colourless crystals. 9. The abbreviation of gram is “g”. 10. The properties of the elements of Group I arc nearly the same. 11. Chemistry is one of the natural scicnccs. 12. The action of oxygen is to oxidize matter. 13. The purpose of chemical analysis is to determine the composition of compounds. 14. To dilute an acid is to make it less concentrated. 15. Gases arc difficult to weigh. 16. Molecules of a gas are free to move in the gas container. 17. On exposure to air active metals bccomc oxidized. 18. A characteristic property of hydrogen is that it exists in three isotopic forms. 19. The chcmical behaviour of an element is how it acts toward other elements. 20. The question is how much hydrogen wc have obtained.
Ex. 11. Translate the sentences into English.
1. Водород был впервые получен в 1766 году. 2. Его получил Ген ри Кавендиш, который в то время работал в Лондоне. 3. Он получал
водород растворением цинка, железа или олова в разбавленной сер ной или соляной кислоте. 4. Комитет решил установить атомный вес водорода 1,008, а кислорода — 16,000. 5. Водород — самый легкий элемент. 6. Название «водород» означает «образующий воду». 7. Уче ные знают три изотопных формы водорода. 8. Одна из них (тритий) — радиоактивна, с коротким периодом полураспада. 9. Водород— один из наиболее распространенных элементов на Земле. 10. Гидриды раз лагаются в воде, испуская водород.
Ex. 12. Make up questions to the italicized parts of the sentences.
1. Hydrogen is recognized in the stars by its spectrum lines in the light that we receive from them (2). 2. Hydrogen forms different kinds o f compounds, some o fthem ionize in solution (3). 3. Hydrogen forms hydrides which arc in general colourlcss crystals (2).
Ex. 13. Answer the following questions:
1. What kind of gas is hydrogen? 2. Why was this gas named “water-former’? 3. Why was hydrogen chosen the unit of measurement for the masses of other elements? 4. What arc the isotopic forms of hydrogen? S. What is the structure of a hydrogen ion? 6. Docs hydrogen occur free in nature? 7. In what forms docs hydrogen mostly occur in nature? 8. How is hydrogen usually obtained?
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