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Edexcel IGCSE Chemistry 4.14 Alkene formulae

Practise explaining how high engine temperatures form oxides of nitrogen and how those gases contribute to acid rain.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • explain that nitrogen and oxygen from air react at high engine temperatures
  • link oxides of nitrogen dissolving or reacting with water to acid rain formation

4.14 Nitrogen oxides in engines question 1

[Maximum number: 2]

This question is about octane (C8H18)\left(\mathrm{C}_{8} \mathrm{H}_{18}\right) which is produced in the gasoline fraction during fractional distillation of crude oil.

A car is driven at constant speed for 4.00 km .

The exhaust gases are collected and their volume at room temperature and pressure (rtp) is 5.02×105 cm35.02 \times 10^{5} \mathrm{~cm}^{3}.

The exhaust gases include carbon dioxide and oxides of nitrogen.
The carbon dioxide is removed from the exhaust gases. The volume of the remaining gases at rtp is 2.96×105 cm32.96 \times 10^{5} \mathrm{~cm}^{3}.

Explain how oxides of nitrogen form in a car engine.

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