Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Crude Oil
106 practice questions
Topics covered
Practice questions
41–44 of 44 · Easy
Question 41
5 marks · Easy
Answer and see the solution →Crude oil is very important in modern life. It is separated into fractions for different uses.
(a)[1 mark]State what crude oil is mainly made of.
(b)[1 mark]Crude oil is separated into fractions. Give one example of a product obtained from a fraction of crude oil and state its use.
(c)[2 marks]Describe how the viscosity and colour of hydrocarbon liquids change as the size of their molecules increases.
(d)[1 mark]Explain why larger hydrocarbon molecules have higher boiling points than smaller ones.
Question 42
5 marks · Easy
Answer and see the solution →Burning fuels from crude oil can cause air pollution and environmental problems. These fuels can be separated into different fractions with different properties and uses.
(a)[2 marks]Explain how burning fuels from crude oil can contribute to acid rain. State one pollutant involved.
(b)[1 mark]Give one way in which using fractions with larger hydrocarbon molecules can increase air pollution compared to using fractions with smaller molecules.
(c)[2 marks]State one property and one use of the gasoline fraction from crude oil.
Question 43
5 marks · Easy
Answer and see the solution →The oil in underground rocks forms over a long time and is separated into fractions by boiling.
(a)[1 mark]State how crude oil forms from ancient sea plants and animals.
(b)[1 mark]A crude oil fraction boils at 350°C. A second fraction boils at 120°C. Calculate the difference in boiling points.
(c)[2 marks]Suggest what you can conclude about the size of hydrocarbon molecules in these two fractions, based on their boiling points.
(d)[1 mark]Give one reason why smaller hydrocarbons are more useful as fuels than larger molecules.
Question 44
5 marks · Easy
Answer and see the solution →Hydrocarbons in crude oil are separated into different groups, called fractions, for different uses. These fractions have different properties.
(a)[1 mark]State what a hydrocarbon is.
(b)[1 mark]State one reason why crude oil is called a non-renewable resource.
(c)[2 marks]Describe one way the boiling point and one way the colour of a hydrocarbon fraction would change as its molecules get bigger.
(d)[1 mark]Explain why smaller hydrocarbon fractions are often used as fuels.