Lawrie Ryan and Roger Norris Solutions for Chapter: Nitrogen, Exercise 5: Question

State one source of nitrogen oxides in our atmosphere that is natural. 

State one source of nitrogen oxides in our atmosphere that is human-made.

Explain why PAN is called a secondary pollutant.

Identify the type of pollution PAN contributes to.

State the condition needed to start off the reaction between VOC's and nitrogen oxides that produces PAN in the atmosphere.

How nitrogen oxides are involved in the formation of atmospheric sulphur trioxide $\left({\mathrm{SO}}_3\right)$. Then write an explanation and equation.

The following reaction takes place in the car's catalytic converter once it is warmed up: 

$2\mathrm{CO}\left(\mathrm{g}\right) + 2\mathrm{NO}\left(\mathrm{g}\right) \to 2{\mathrm{CO}}_2\left(\mathrm{g}\right) +{\mathrm{N}}_2\left(\mathrm{g}\right)$

Use oxidation numbers to explain which species is reduced and which is oxidised in the reaction.