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III. Answer the questions:

1. What is petroleum?

2. Does it contain only carbon and hydrogen?

3. What other elements does it contain?

4. Are physical and chemical properties of different samples of petroleum uniform?

5. What do these properties depend on?

6. How many classes do gaseous and liquid hydrocarbons fall into? What are they?

7. What can you say about the colour of petroleum?

8. What is the odour of petroleum determined by?

9. What is an index to the value of oil?

10. What oils have greater value?

11. What are the main uses of natural hydrocarbons?

IV. Read and translate the following words:

a) inorganic matter, liquid, solid, gaseous, physical, chemical structure, class, paraffines, viscosity, naphthenes, aromatic hydrocarbons, oxygen;

b) yellow, green, brown, black, red, light, great, different, main;

d) consist of, contain, depend on, composition, compound, property, prove, fall into, utilize.

V. Read and translate the words of the same root:

Value – valuable, physics – physical, chemistry – chemical, gas – gaseous, considerable – considerably, agree – agreeable – disagreeable, colour – colourful - colourless, odour – odourless, vary – variable, wide – widely

VI. Translate into Russian:

a) short – shorter – shortest, important – more important – most important, good – better – best;

b) the nearer … the denser, the more … the better, the lower … the higher

VII. Find English equivalents to the following Russian sentences in the text:

1. Чем больше летучих углеводородов в сырой нефти, тем ниже точка кипения.

2. Более легкие нефти имеют большую ценность.

3. Некоторые нефти могут быть бесцветными.

4. Более легкие нефти содержат больше бензина.

VIII. Translate the following words and expressions:

состоять из, ценное сырье, другие соединения, неорганические вещества, химический состав, жидкий, твердый, удельный вес, точка кипения.

IX. Use the prореr words and expressions:

1. Petroleum (contains. consists, proves) of' carbon and hydrogen.

2. Physical and chemical properties (protect, depend) on the che­mical composition and presence of impurities.

3. The odour of сrude oil is (made up, determined) by its composition.

4. The boiling points of crude oil are quite (the same, different, variable).

X. Translate into English:

1. Нефть - ценное углеводородное сырье.

2. Она состоит из углерода и водорода.

3. Различные нефти обладают различными свойствами.

4. Жидкие и твердые углеводороды делятся на 3 класса.

5. Удельный вес нефти - показатель ее ценности.

6. Углеводороды широко используются в качестве топлива и сырья для нефтеперерабатывающей промышленности.

XI. Read and translate the text without a dictionary in a written way:

Petroleum is a hydrocarbon, that is, it consists оf molecules containing atoms of hydrogen and carbon. The raw material of crude oil is found in oil fields where oil has accumulated in reservoir rocks rather dееp below ground. Crude oil is a mixture of molecules which differ mainly in the number of atoms of hydrogen and carbon out of which it consists. Usually small amounts of other substances are also found in crude oil. There are obviously а large number of possible mixtures and crude oils vary from field to field.