When oxides of nitrogen escape into the atmosphere they may be involved in: - formation of acid rain from sulfur dioxide - formation of photochemical smog. (i) Identify the role of NO and $$$\mathrm{NO}_{2}$$$ in the formation of $$$\mathrm{H}_{2} \mathrm{SO}_{4}$$$ from $$$\mathrm{SO}_{2}$$$ in the atmosphere to produce acid rain. Use relevant equations to support your answer. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ................................................................................................................................. (ii) Outline how NO and $$$\mathrm{NO}_{2}$$$ may contribute to the formation of photochemical smog. ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_23 Year：2024 Question No：2(d)

Answer:

8.3.1.1 explain that, in the presence of a catalyst, a reaction has a different mechanism, i.e. one of lower activation energy

8.3.1.2 explain this catalytic effect in terms of the Boltzmann distribution

8.3.1.3 construct and interpret a reaction pathway diagram, for a reaction in the presence and absence of an effective catalyst