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III. Language.

Exercise 7. Match the words in column A with their equivalents in column B .

A В

1.burning 1. приблизно

2. to melt 2 . зварювання

3.adjacent 3 . горiлка

4.slightly 4 . блiдий

5. approximately 5 . згоряння

6.cutting 6 . плавити

7.welding 7 . горiння

8. burner 8 . сусiднiй

9. pale 9 . рiзання

Exercise 8. Insert in the sentences the suitable words and word-combinations given below :

1.Oxygen is a … of combustion and forms oxides with both metals and non-metals .

2. Oxygen is slightly … in water .

3. Oxygen will combine with all the elements … the inert gases .

4 .Air is a … of gases .

5 .Air usually contains water … and dust .

6.In … oxygen is used in combination with such gases as hydrogen , acetylene and propane .

( mixture , vapour , soluble , welding and cutting , except , supporter )

Exercise 8.Read the sentences paying attention to the translation of the verb would.

1.He said that he would carry out this experiment once more .—Він сказав, що він здійснить цей експеримент ще раз.

2. If we cooled oxygen to -192.98 оC , it would boil . — Якби ми охолодили кисень до -192.98оС, він би закипів.

3.If they had obtained good results in their experiments , they would have discussed them at the conference. - Якби вони отримали гарні результати у своїх експериментах , вони б обговорили їх на конференції.

4.At high temperature this substance would decompose. – При високій температурі ця речо-

вина б розклалась.

5.Water would boil at 100 оC. – Вода кипить при 100 оС .

6.Were she invited to that conference , she would make a report .—Якби її запросили на конференцію, вона б зробила доповідь.

Exercise 9. Read and translate the sentences paying special attention to the verb would (see ex.8 )

1 . They said that they would take into account the properties of oxygen .

2 . If the reaction proceeded at the given temperature , the end product would increase .

3 . If they had obtained good results in their experiments , they would have discussed them at the conference .

4. According to the hypothesis concerned , the material would be a good insulator of electricity.

5. Liquid oxygen would boil at -192.98 C .

6 . Had he not investigated this phenomenon , he would not have got such interesting results.

7. Were she present at the conference she would take part in the discussion .

IV. Comprehension.

Exercise 10. Answer the questions:

1. What is the most abundant element on our planet?

2. Does oxygen occur in combined or free state in nature ?

3.What are the physical prop­erties of oxygen?

4.What is the most outstanding chemical property of oxygen ?

5. What percentage of the crust does nitrogen form ?

6. Why does oxygen combine with metals ?

7. What does air consist of ?

8. In what processes is oxygen used ?

9. How is oxygen used in the oxypropane burner ?

Exercise 11. Say whether it is true or false. If false, say why. Begin with

1). I fully/ quite agree with you

2). I cannot agree with you here.

3). To the best of my knowledge.

4). In my opinion.

1. Nitrogen is one of the most common elements on the Earth.

2. The mass of the atmosphere is small compared with the mass of the crust.

3. The composition of the atmosphere is constant.

4. Air normally contains only gases.

5. The inert gases constitute approxi­mately 1% of the atmosphere.

6. The inert gases include oxygen.