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CAIE A-Level Chemistry 14.1.6 Alkane Combustion Pollutants

Practise identifying CO, NOx and unburned hydrocarbons from engines and explaining their catalytic removal.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • link incomplete combustion to toxic CO and unburned fuel, and high engine temperature to NOx formation
  • state that CO and hydrocarbons are oxidised while nitrogen oxides are reduced in a catalytic converter
  • connect NOx and unburned hydrocarbons to PAN and photochemical smog without treating every pollutant alike

14.1.6—Combustion pollutants and catalysts question 1

[Maximum number: 1]

Polymer Z is useful because it absorbs large amounts of water. However, there are problems associated with the disposal of products containing polymer Z.

Combustion is not an appropriate method to dispose of pure Z because the process releases harmful gases. Some of these gases contribute to the enhanced greenhouse effect.

Identify another gas which could be produced during the combustion of pure Z. Describe a consequence, other than the enhanced greenhouse effect, of its release into the atmosphere.
gas
consequence

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