3 Part One. The Predicate

Section III
Ex. 1. Think of the situations when a disjunctive question may be used,

Examples:

1) She is the first-year student, isn’t she?— Yes, she is.

You were absent yesterday, weren’t you? — Yes, I was.

You have done the exercise, haven’t you? — Yes, I have.

2) She hasn’t finished her speech, has she? — No, she hasn’t.

We haven’t yet studied such reactions, have we?—No, we haven’t
Ex. 2. Translate the following questions into English. Let your fellow students respond to them.

1. Biz allaqachon vodorod va kislorod haqida ko'p narsalarni bilamiz, shunday emasmi? 2. Ishqoriy metallarning kimyoviy xossalari juda qiziq, to'g'rimi? 3. Siz laboratoriya ishingizni tugatmadingiz, shunday emasmi? 4. U to'g'ri, shunday emasmi? 5. Bu kitob siz uchun unchalik qiyin emas, shunday emasmi? 6. Siz o'qishni yaxshi ko'rasizmi, to'g'rimi? 7. U Sredniyda yashaydi, to'g'rimi? 8. Siz bugun o'qituvchingizni ko'rgansiz, to'g'rimi? 9. 21-auditoriyada talabalar yo'q, shunday emasmi? 10. Bizda bo'sh vaqt yo'q, to'g'rimi?

Ex. 3. Make up sentences or short stories with the following words:

1) hydrogen, element, unit, other, be, it, use, lightest, mass chemical, measurement, element; 2) first, dissolve, iron, Cavendish, obtain, zinc, tin, hydrogen, acid, diluted, sulphuric; 3) be, clement, earth, hydrogen, abundant, spectrum, find, line, stars; 4) prepare, some, metal, at present, hydrogen, reaction, water

Ex. 4. Give detailed answers to the following questions:

1. What are the physical properties of hydrogen? 2. In what way was hydrogen obtained first? 3. What are the chemical properties of hydrogen? 4. What do you know about the isotopic forms of hydrogen? 5. What are the ways of obtaining hydrogen?

Ex. 5. Discuss the following topics:

1. The Structure of a Hydrogen Atom.

2. Hydrogen as the Unit of Measurement for the Masses of Other Elements.

3. The Difference Between the Isotopic Forms of Hydrogen.

4. Commercial Obtaining of Hydrogen.
DO YOU KNOW THAT...

In accordance with the theory of acids existing at that time, the result of the reaction of inflammable air and oxygen was expected in the form of an acid, but what Lavoisier obtained was only water. Later he learnt that Henry Cavendish in London had made similar experiments and had obtained water as a result of a combustion of the mixture of “inflammable air” and oxygen. Lavoisier repeated the experiment and made a striking discovery that water was not an element. And he gave “inflammable air” the name of hydrogen.