Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
As fuels
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State the name of the process used to separate crude oil into useful fractions and give one reason why crude oil must be separated in this way.
Question 2
4 marks · Normal
Answer and see the solution →This question is about combustion of hydrocarbons.
(a)[1 mark]Write the word equation for the complete combustion of propane.
(b)[1 mark]State the two main products formed during complete combustion of a hydrocarbon.
(c)[2 marks]Explain, using your knowledge of incomplete combustion, why burning a hydrocarbon in a limited supply of air may produce a dangerous gas.
Question 3
3 marks · Normal
Answer and see the solution →Explain why burning hydrocarbons in a poorly ventilated room can lead to serious health risks. In your answer, refer to the products formed during incomplete combustion.
Question 4
4 marks · Normal
Answer and see the solution →The table below shows information about some fractions obtained from crude oil.
Fractions from crude oil Fraction Approximate Boiling Point (°C) Main Use Refinery gas < 40 Bottled gas Gasoline 40–100 Fuel for cars Diesel oil 250–350 Fuel for lorries Bitumen > 350 Road surfacing (a)[1 mark]Identify the fraction with the lowest boiling point and state its main use.
(b)[2 marks]Which fraction is most likely to contain the largest hydrocarbon molecules? Explain your answer using data from the table.
(c)[1 mark]Suggest why bitumen is not used as a fuel.
Question 5
1 mark · Normal
Answer and check →Which gas is a poisonous product of incomplete combustion of hydrocarbons?
- A.Carbon dioxide
- B.Nitrogen
- C.Carbon monoxide
- D.Oxygen
Question 6
2 marks · Normal
Answer and see the solution →Name two main fractions produced by the fractional distillation of crude oil and give one use for each.
Question 7
4 marks · Normal
Answer and see the solution →This question is about combustion of hydrocarbons and pollution.
(a)[1 mark]Name the two conditions necessary for the complete combustion of a hydrocarbon.
(b)[1 mark]Write the balanced word equation for the incomplete combustion of methane, producing carbon monoxide as one of the products.
(c)[2 marks]Explain why carbon monoxide is produced during incomplete combustion and state one environmental or health effect it can cause.
Question 8
3 marks · Normal
Answer and see the solution →A certain crude oil contains 1000 kg of hydrocarbons. When it is separated by fractional distillation at a refinery, the following fractions are collected:
Fraction Percentage by mass Refinery gas 4% Gasoline 20% Kerosene 15% Diesel oil 18% Fuel oil 23% Bitumen 20% Calculate the mass of the kerosene fraction obtained from this crude oil. Give your answer in kilograms.
(a)[3 marks]Show your working and give your final answer with the correct unit.