QUIZ ORGANIC CHEMISTRY

Crude oil is a mixture of a large number of compounds most of which are hydrocarbons such as

the molecule shown below.

i. What is a Hydrocarbons_______?

ii. What is the chemical formula of the molecule shown above?

Alkanes are hydrocarbons found in crude oil. Hydrocarbons contain the elements_________and_________only.

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Alkanes are hydrocarbons with the general formula

• CnHn

• CnH2n

• CnH2n+2

Describe and explain how crude oil is separated into fractions by fractional distillation?

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Dodecane (C12H26) from crude oil is cracked to produce ethene (C2H4).

(i) Complete the equation for this reaction above

C12H26 --------> 2C2H4 + _________

Give two conditions needed for cracking.

________ and ________

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Propane (C3H8) is used as a fuel.

Complete the equation for the complete combustion of propane.

C3H8 + 5O2 ------> 3______ + 4_______

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iExplain why C8H18 has a lower boiling point than C14H30

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A molecule of ethene (C2H4) is represented above.

A sample of ethene is shaken with bromine water.

Complete the sentence.

The bromine water turns from orange to _________

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