Review Questions

1. Explain why OH" reacts more quickly than HOO" to abstract hydrogen from other molecules.

2. How does OH* react with molecules that contain hydrogen but not multiple bonds?

3. What are the two different initial steps by which atmospheric formaldehyde, H2CO, is decomposed in air?

4- What is the reaction by which most nitric oxide molecules in the troposphere are oxidized to nitrogen dioxide?

5, What are the two common reactions by which diatomic oxygen reacts with tree radicals?

6. Explain why photochemical smog is an autocatalytic process.

7. What is the fate of OH* radicals that react with NO * ? With NOJ ? With other OH' ?

8. What is the fate of NOj molecules that photodissociate? That react with ozone? That react withRCOO' radicals?

9. Why does the production of high concentrations of NOj lead to an increase in ozone levels in air? Why does this not occur if much NO" is present?

10. What is the formula of nitrate radicals? Explain how they are similar in reactivity to hydroxyl radicals.

11. Explain how atmospheric sulfur dioxide is oxidized by gas-phase reactions in the atmosphere.

12. Explain what is meant by the term loosely bound oxygen. What are its four characteristic reactions in stratospheric chemistry?

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