01. Hydrocarbons and fractional distillation of crude oil

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9 Terms

1
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What are hydrocarbons?

Molecules that have carbon and hydrogen only

2
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What is crude oil?

A mixture of hydrocarbons

3
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How can you separate different hydrocarbons in crude oil?

Can be separated into fractions -> Each having molecules with similar number of C atoms

4
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Why does fractional distillation work?

Different fractions boil at different temperatures

5
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What happens first in fractional distillation?

Crude oil is boiled/vapourised before entering fractioning column

6
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What happens to the hydrocarbons in the fractioning column?

They condense at different heights in the column

7
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Describe the molecules that condense at the bottom of the fractioning column?

Large molecules -> long chain, HBP, high viscosity, low flammability

8
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Describe the molecules that condense at the top of the fractioning column?

Small molecules -> short chain, LBP, low viscosity, high flammability

9
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What are the colours of the fractioning column?

Bottom is red top is blue