Pearson Edexcel IAL Chemistry 4.14 Problems from combustion pollutants

Practise linking combustion pollutants to hazards, including carbon monoxide toxicity and acidic oxides damaging the environment.

Exam points

explain CO toxicity by its bonding to haemoglobin, especially in enclosed combustion contexts
link NOx or sulfur oxides to acid rain through reaction or dissolving in water

[Maximum number: 1]

Some diesel cars contain an extra catalytic converter for the reduction of nitrogen oxides $\left(\mathrm{NO}_{\mathrm{x}}\right)$ in exhaust gases.
A solution of urea is used for this process.

Figure for Question 4.14—The problems arising from pollutants from the combustion of alkane fuels question 1 — Edexcel A-Level Chemistry AS

urea

State why $\mathrm{NO}_{\mathrm{x}}$ emissions are harmful to the environment.

An answer that makes reference to the following point:

- (oxides of nitrogen lead to the formation of) acid rain

Allow formation of photochemical smog

Allow "NO can react with ozone"

Allow descriptions of acid rain formation e.g. forms $\mathrm{HNO}_{3}$

Do not award greenhouse effect / global warming

Do not award depletes the ozone layer without reference to nitrogen(II) oxide/NO

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4.14—The problems arising from pollutants from the combustion of alkane fuels question 1