3 Part One. The Predicate

Section III
Ex. 1. Think of situations when the following expressions may be used:

sorry, I’m sorry, excuse me, that’s all right, never mind, not at all, thank you, thanks

Ex. 2. Translate the following sentences into English. Let your fellow students respond to them. Use expressions from exercise 1.

1. Kechirasiz, men kechikdim. 2. Men tarjimani tugatmaganim uchun meni laboratoriyaga chaqirishadi. 3. Menga yordam berganingiz uchun tashakkur.

4. Kechirasiz, ertaga nima qilishimni bilmayman. 5. Kitob uchun rahmat. 2 kun ichida o'qidim. U juda qiziq. 6. Bu juda achinarli, men kimyoda faqat "3" oldim.

7. Siz matematikani yoqtirasizmi? 8. Oxirgi darsda o'qituvchi nima dedi?

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

1) be, Priestley, scientist, amateur, English; 2) pharmacist, work, Swedish, Scheele, independently, obtain, gas, oxygen, know, We; 3) they, gas, role, combustion, find, play, cvidcncc, important; 4) French, Lavoisier, modem, combustion, chemist, establish, theory; S) free oxygen, second, state, occur, most, component, atmosphere, abundant; 6) generally, obtain, liquid, oxygen, commercially, air, distillation; 7) way, oxygen, be, another, obtain, water, electrolysis

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

1. In what way did Priestley and Scheele obtain oxygen? 2. What is the modem concept of combustion? 3. What is the role of oxygen in combustion? 4. Who established this concept first? 5. Is oxygen an abundant clement? Give some examples. 6. What are the physical properties of oxygen? 7. What ways of preparing oxygen in the laboratory do you know? 8. How is oxygen made commercially?

Ex. 5. Discuss the following topics:
1. Physical Properties of Oxygen.

2. Chemical Properties of Oxygen.

3. Preparation of Oxygen.

4. The History of the Discovery of Oxygen.

DO YOU KNOW THAT...
The phlogiston theory of combustion was still prevalent in Russia in the middle of the eighteenth century. It came into conflict with the corpuscular theory put forward by Lomonosov. His experiments on the calcination of metals helped Lomonosov to find evidence against it and led him to the discovery of the main law of chemistry — the law of conservation of mass and energy.