Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
As fuels
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State the trend in boiling point and position within the fractionating column for hydrocarbons with increasing chain length, giving a reason for each.
Question 2
5 marks · Hard
Answer and see the solution →Pentane (C₅H₁₂) is a hydrocarbon fuel.
(a)[2 marks]Write a balanced chemical equation, using formulae, for the complete combustion of pentane.
(b)The supply of oxygen is reduced so that incomplete combustion occurs.
(i)[2 marks]Name two products, other than water, that could be formed during incomplete combustion of pentane.
(ii)[1 mark]Explain why less heat is released during incomplete combustion than during complete combustion.
Question 3
2 marks · Hard
Answer and see the solution →State two reasons why the fractions obtained from crude oil by fractional distillation are useful as fuels.