Nitrogen

The position of nitrogen in the Periodic Table makes us expect this element to be active chemically, like its neighbours oxygen and phosphorus, but this is not the case with nitrogen. Nitrogen differs from all the other elements of this group. At ordinary temperatures it is a colourless gas, consisting of diatomic molecules. Nitrogen does not burn, nor does it support combustion. While heating it combines to some extent with oxygen, forming NO, and more readily with some of the active metals. Thanks to its inertness it is difficult to make nitrogen combine with other metals. Nitrogen can combine with hydrogen to form ammonia, only by use of a suitable catalyst.

Active nitrogen combines readily with many elements including sulphur and phosphorus. Volatile compounds with hydrogen are characteristic of all the non-metals. The nitrogen compound of this type is ammonia. Ammonia is a colourless gas possessing a characteristic pungent odour. The reaction between ammonium salts and an alkali is used to identify ammonium salts. Aside from its use in the manufacture of ammonia, nitric acid and other compounds the nitrogen of the air is of great importance to man and to all forms of life. For example , it dilutes oxygen and therefore retards oxidation. The surrounding air is a mixture of nitrogen and oxygen with small amounts of other gases.

Задание 2: Перепишите предложения, подчеркните в каждом инфинитив и укажите его функцию, т.е. определите, будет ли инфинитив подлежащим, обстоятельством, определением или частью составного именного сказуемого. Предложения переведите.

1. The solution to be examined was placed into a glass vessel.

2. To solve this problem immediately is very difficult.

3. The task of doctors is to prevent and treat diseases.

4. To obtain good results in the treatment the patient is to keep to the doctor's instructions.

Задание 3: Перепишите предложения, подчеркните Participle I, укажите его функцию, т. е. определите, будет ли оно определением, обстоятельством или составной частью сказуемого.

1. The element possessing this property makes the experiment impossible.

2. Investigating these phenomena the scientists got interesting results.

3. It is necessary to avoid sun lights if you are taking this medication.

Задание 4: Перепишите предложения; подчеркните глагол-сказуемое и определите его видовременную форму и залог; напишите форму инфинитива. Предложения переведите.

1. While carrying out experiment the student is studying the properties of substance.

2. The results of that work were being reported at the conference for 2 hours.

3. My friend will be finishing his work at 10 o'clock tomorrow.

4. He was being treated from pneumonia for a period of two weeks.

5. This problem is very complex and that is why it is being studied now by scientists all over the world.

Задание 5: Перепишите предложения, подчеркните глагол to do и определите, является ли он смысловым, вспомогательным или словом заместителем. Предложения переведите.

1. The specialist always does his work in the laboratory.

2. I do not feel any pain.

3. The qualitative analysis gave us much better results than the quantitative one did.

Задание 6: Выпишите предложения, где конструкции с глаголами to have, to be выражают долженствование, предложения переведите.

1. The patient has a running temperature.

2. For many years our scientists were doing great attempts in search of new cardiac drugs.

1. 3 Elements with the same properties are at definite intervals in the Periodic Table.

3. The doctor has to take the patient's temperature.

4. Penicillin is an antibiotic which is to be injected intramuscularly.

Задание 7: Перепишите предложения, подчеркните в каждом придаточное предложение; подчинительный союз или союзное слово обведите кружком; при бессоюзном подчинении укажите на место, где мог бы находиться опущенный союз. Предложения переведите.

1. The double sulphates form a large group of salts whose structure is often very difficult to determine.

2. The first compound of chlorine we shall study in detail is its compound with hydrogen.

3. We saw how the rise of temperature influences the solubility of these substances.

4. We know that nitric acid is widely used in chemical industry.

Контрольная работа № 2

по английскому языку

для студентов I курса

фармацевтического факультета заочного отделения

ВАРИАНТ IV

Задание 1: Прочитайте и письменно переведите текст на русский язык.