obtained ... hydrogen... dissolving... zinc, iron or tin ... diluted H
2
S 0
4
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.
13. Hydrogen is usually obtained ... action... sulphuric acid ... zinc.
Ex. 9. a)
Fill in the blanks with some, any, no.
1. There i s ... 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 o f 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 D
2
0 . 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 o f
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
44
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 f them 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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