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2. Read and translate the text below and do the exercises: ПЕРЕВОД и ЗАДАНИЕ OIL FORMATION 1. Crude oil is a complex mixture of hydrocarbons
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2. Read and translate the text below and do the exercises:
ПЕРЕВОД и ЗАДАНИЕ
OIL FORMATION
1. Crude oil is a complex mixture of hydrocarbons with minor proportions of other chemicals such as compounds of sulphur, nitrogen and oxygen. To use the different parts of the mixture they must be separated from each other. This separation is called refining.
2. Crude oils from different parts of the world, or even from different depths in the same oilfield, contain different mixtures of hydrocarbons and other compounds. This is why they vary from light colored volatile liquids to thick, dark oils – so viscous that they are difficult to pump from the ground.
3. Hydrocarbons vary in structure depending on the number of carbon atoms and the way in which the hydrogen atoms combine with them. Hydrocarbons can be arranged as straight chains, branched chains or closed rings. There are two main chemical families of hydrocarbons – the alkanes and the alkenes.
4. As the structure of hydrocarbons varies so much, thousands of synthetic products can be manufactured with many different properties. Hydrocarbons with small molecules make good fuels. Methane (CH4) has the smallest molecules, and is a gas, used for cooking and heating and generating electricity. Gasoline, diesel, aviation fuel and fuel oil are all liquid fuels.
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