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Crude Oil
Crude oil contains mainly saturated hydrocarbons called alkanes.

Crude Oil

This Chemistry quiz is called 'Crude Oil' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.

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Crude oil is nicknamed 'black gold' as it has made many people very rich. It is formed from the remains of dead sea creatures and plants that sink to the bottom of the oceans where they decay anaerobically as they become buried in the sea bed mud. As the mud turns to rock and becomes buried by newer sediments, the oil, being a liquid, will rise and can become trapped underground by an impermeable rock layer. This trapped oil can be released by drilling through the impermeable rock. This high school Chemistry quiz is all about the compounds that can be extracted from it.

Some oil does not get trapped and seeps out at the surface of the Earth, for example at the 'Fountains of Pitch' in Iraq. At the surface, most of the volatile chemicals evaporate leaving behind a thick tar-like substance called either pitch or asphalt. Crude oil was first used in this form about 6000 years ago by ancient civilisations of the Middle East for waterproofing boats and pottery as well as to stick building stones together. The Chinese are thought to have been the first to have drilled for oil almost 2000 years ago.

The modern petroleum industry began in the nineteenth century. Scottish drugstore James Young managed to successfully distill a light oil that could be used in oil lamps from a seepage of petroleum from a mine in Derbyshire. He was also the first person to be able to obtain a substance like crude oil from coal and set up what is regarded as the first commercial oil refinery with two business partners in Glasgow. Drugstores in Eastern Europe were also distilling crude oil at about the same time as Young but it is generally accepted that this industry really began when an American called Edwin Drake drilled his oil well in 1859 in Pennsylvania in the USA. There were earlier wells but this was the first to be mechanically drilled.

Young's successful distillation relied on the fact that the compounds in crude oil have different boiling points. Crude oil is a mixture of hydrocarbons from the alkane family which can be extracted. As you heat up the mixture, the alkanes with the lowest boiling points will start to evaporate. Their vapor can be collected and condensed - you may have seen this demonstrated at school. As each alkane evaporates off, the temperature will rise and the next will boil and so on until you are left with the alkane with the highest boiling point.

The industrial process is slightly different. The crude oil is completely vapourised and introduced into a tall steel vessel called a fractionating column. Inside this, there is a temperature gradient; the base is the hottest and the top is the coolest. As the vapors rise, they cool. When they reach the part of the column that is at the temerature equal to their boiling point, they condense. There are collecting trays at different points within the column that collect the condensed fractions of oil. Each of the fractions of crude oil still contains a mixture of alkanes, but with a much smaller range of carbon chain lengths than the original oil.

Try this quiz and see how well you understand the compounds that can be extracted from crude oil.

1.
Which of the following is the thickest liquid?
C3H8
C8H18
C12H26
C16H34
Viscosity of the alkanes increases as the molecule gets bigger
2.
Which of these compounds catches fire most easily?
C3H8
C8H18
C12H26
C16H34
Alkanes with smaller molecules are far more volatile than large ones. It is the vapor from a flammable liquid that burns so the more volatile chemicals from crude oil are easier to ignite
3.
Which of these compounds is collected at the top of the fractionating column?
C3H8
C8H18
C12H26
C16H34
This is propane which is a gas at room temperature
4.
Fractional distillation uses which physical property to separate the substances in crude oil?
Melting point
Boiling point
Tensile strength
Freezing point
Crude oil is a mixture of hundreds of alkanes and each has a different boiling point
5.
Which of these compounds has the highest boiling point?
C3H8
C8H18
C12H26
C16H34 
The more carbon atoms there are in an alkane, the larger the molecule and the higher the boiling point
6.
Which of the following is a saturated hydrocarbon that could be found in diesel oil?
C4H10
C16H32
C17H36
C18H38O
Diesel cars give better fuel consumption figures than gasoline cars because diesel fuel molecules are larger and therefore release more energy than gasoline molecules which only have about 8 carbon atoms
7.
Crude oil is fed into the fractionating column...
at high pressure
with a catalyst
as a vapor
with water
It is heated to a temperature in excess of 300oC
8.
Hydrocarbons with the smallest molecules have the...
lowest boiling points
lowest flammability
lowest volatility
highest viscosity
Smaller molecules have smaller inter-molecular forces to hold them together
9.
Crude oil contains mainly saturated hydrocarbons called...
haloalkanes
alkenes
alkanes
cycloalkanes
A saturated hydrocarbon contains only single bonds
10.
Petrol...
has a higher boiling point than diesel oil
is a thinner liquid than diesel oil
ignites less easily than kerosene
has larger molecules than kerosene
It contains alkanes with fewer carbon atoms than diesel
Author:  Kate Gardiner

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