. . These reactions are termed chain reactions because the ozone-destroying radical (e.g. This result radicals can further react as such: + + + O. Chlorine monoxide reacts with one of the oxygen radicals formed by Chlorine acts as a catalyst in turning ozone into oxygen in a reaction that wasn't understood until 1973. Chlorine (Cl) is initially removed by reaction with ozone to form chlorine monoxide (ClO) in the first equation, but it is regenerated through reaction of ClO with an oxygen atom (O) in the second equation. Free chlorine atoms then react with ozone molecules, taking one oxygen atom to form chlorine monoxide and leaving an ordinary oxygen molecule. Ozone reacts with free aqueous chlorine when present as hypochlorite ion (OCl ) with a second order rate constant of 120 15 M 1 s 1 at 20C. This, in turn, will lead to the breakdown of ozone. The destruction of ozone, also animated. At the end of the sequence, another chlorine radical has been produced, and so the reaction can happen again, and again, and . The net result of the two reactions is the depletion of ozone and atomic oxygen. The chlorine radical rapidly reacts with ozone (step 2) to form molecular oxygen and a chlorine monoxide radical. + + This reaction causes the depletion of the ozone layer. Step 3 appears to be a chain termination step, as two chlorine monoxide radicals combine. Ozone Depletion Reactions. Additionally, presence of other atoms in the ozone layer have a small chance of destroying the radical chlorine, causing it to form $\ce{HCl}$ or $\ce{ClONO2}$. thats the formation of chlorine radicals the chlorine reacts with an ozone molecule forming chlorine monoxide and oxygen. About 77% of the chlorine reacts to produce Cl and 23% is oxidized to ClO 3.No ClO 4 is formed. Ozone as a pollutant in the lower atmosphere When a free chlorine atom and an ozone molecule interact, the chlorine atom strips the third oxygen molecule to form chlorine monoxide, an unstable compound, and leave a stable oxygen molecule. Chlorine monoxide is a chemical radical with the chemical formula .It plays an important role in the process of ozone depletion.In the stratosphere, chlorine atoms react with ozone molecules to form chlorine monoxide and oxygen. (1MB) If each chlorine atom released from a CFC molecule destroyed only one ozone molecule, CFCs would pose very little threat to the ozone layer. (a) Other free radicals in the stratosphere can also remove ozone. Hence, CFCs are transporting agents that are responsible for damaging the ozone layer. Chlorine monoxide radicals will further react with atomic oxygen to form more chlorine radicals. One chlorine radical has effectively destroyed two ozone molecules. If we show a free radical by the general symbol X then the mechanism for the catalytic destruction of ozone is as follows: ClO(g) + O(g) Cl(g) + O 2 (g) This process will continue and constantly regenerate chlorine radicals. The chlorine radical then reacts with ozone as follows: sp sual Cl +O3 CIO + O2 CIO + O Cl + O2 -> The O atom is from the photochemical decomposi- tion of O, molecules. Cl. Reactions like this are known as chain reactions. Other free radicals in the stratosphere can also remove ozone. Chlorine and bromine atoms are also known as free radicals. In addition to UV absorption and oxygen radical reaction (see Chapman Reactions), ozone can be destroyed by combination with other radical species.The most prominent reactions are the HO x, NO x, and Cl radical chain reactions:. + O3 -----> ClO + O2 oxygen is photodissociated into radicals, such as: O2 -----hv-----> O.

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