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SQA National 5 Chemistry Crude Oil

Crude Oil

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Crude oil is made up of decayed organisms (mostly plankton) that died millions of years ago and became buried within the Earth's crust. It is a hydrocarbon mixture used as a source for fuels and plastics.

What is crude oil

Fractional distillation is a method to separate crude oil into 'fractions' depending on the length of the hydrocarbon chains. It is very hot at the bottom and becomes cooler to the top to condense fractions at different points.

Fractional distillation

Going up the fractional distillation column the temperature decreases so fractions have lower condensation points. Using this information you can infer the other properties of the fractions.

Physical properties of fractions

Crude oil has a variety of applications in industry and everyday life.

Uses of crude oil

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What type of chemical compounds are found in crude oil?

SQA National 5 Chemistry Crude Oil What type of chemical compounds are found in crude oil?
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2

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How does running heated crude oil through the column separate fractions?

SQA National 5 Chemistry Crude Oil How does running heated crude oil through the column separate fractions?
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3

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Are molecules at the top of the column more or less volatile than molecules that leave at the bottom of the column in the distillation of crude oil? Why?

SQA National 5 Chemistry Crude Oil Are molecules at the top of the column more or less volatile than molecules that leave at the bottom of the column in the distillation of crude oil? Why?
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4

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Would you expect diesel to be condensed out of the column higher or lower than petrol? Why?

SQA National 5 Chemistry Crude Oil Would you expect diesel to be condensed out of the column higher or lower than petrol? Why?
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5

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Which is lighter in colour, petrol or kerosene? Why?

SQA National 5 Chemistry Crude Oil Which is lighter in colour, petrol or kerosene? Why?
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6

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Other than petrol, what other product, derived from crude oil, is regularly used in car engines?

SQA National 5 Chemistry Crude Oil Other than petrol, what other product, derived from crude oil, is regularly used in car engines?
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7

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Why are smaller fractions usually more useful than longer chain fractions?

SQA National 5 Chemistry Crude Oil Why are smaller fractions usually more useful than longer chain fractions?
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8

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What is one advantage of using crude oil?

SQA National 5 Chemistry Crude Oil What is one advantage of using crude oil?
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