3 Part One. The Predicate

on, by, of, in, with, between, to, out, at, in order to, for

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 come ... 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 are 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 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 come already? 6 . They haven’t read ... texts yet. 7. Are 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 are some students in the room. 2. There are some mistakes in his test-paper. 3. There are some books on the table. 4. There is some information on this process. 5. There is some oxygen in the tube. 6. There are some interesting articles in this journal.
Ex. 10. Translate the sentences into Uzbek; say what the predicatives are expressed by.

1. Hydrogen is the lightest chemical 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 are almost whole numbers. 4. The atomic weight of oxygen is 16.000. 5. Tritium is radioactive. 6 . The formula of heavy water is D₂O . 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 are nearly the same. 11. Chemistry is one of the natural sciences. 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 are difficult to weigh. 16. Molecules of a gas are free to move in the gas container. 17. On exposure to air active metals become oxidized. 18. A characteristic property of hydrogen is that it exists in three isotopic forms. 19. The chemical behaviour of an element is how it acts toward other elements. 20. The question is how much hydrogen We have obtained.

Ex. 11. Translate the sentences into English.

1. Vodorod birinchi marta 1766 yilda olingan. 2. Uni o'sha paytda Londonda ishlagan Genri Kavendish oldi. 3. U suyultirilgan sulfat yoki xlorid kislotasida rux, temir yoki qalayni eritib vodorod oldi. 4. Qo'mita vodorodning atom og'irligini 1,008 va kislorodni 16000 ga belgilashga qaror qildi. 5. Vodorod eng yengil element. 6. "Vodorod" nomi "suv hosil qilish" degan ma'noni anglatadi. 7. Olimlar vodorodning uchta izotopik shaklini bilishdi. 8. Ulardan biri (tritium) radioaktiv bo'lib, umri qisqa. 9. Vodorod Yerdagi eng keng tarqalgan elementlardan biridir. 10. Gidridlar suvda parchalananib, vodorod chiqaradi.

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 are 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 are the isotopic forms of hydrogen? 5. What is the structure of a hydrogen ion? 6. Does hydrogen occur free in nature? 7. In what forms does hydrogen mostly occur in nature? 8. How is hydrogen usually obtained?