triple forms of oxygen are involved in the ozone-oxygen cycle: oxygen atoms (O or atomic oxygen), oxygen gas (O2 or diatomic oxygen), and ozone gas (O3 or triatomic oxygen). Ozone is formed in the stratosphere when oxygen molecules painting dissociate after absorbing an ultraviolet photon whose wavelength is shorter than 240Â nm. This converts a whiz O2 into two atomic oxygen thoroughs. The atomic oxygen radicals and so combine with separate O2 molecules to create two O3 molecules. These ozone molecules absorb UV light between 310 and 200Â nm, fol impoverisheding which ozone splits into a molecule of O2 and an oxygen atom. The oxygen atom then joins up with an oxygen molecule to regenerate ozone. This is a continuing process which terminates when an oxygen atom recombines with an ozone molecule to make two O2 molecules.
Ozone gets be destroyed by a number of free radical catalysts, the just about important of which are the hydroxyl radical (OH·), the nitric oxide radical (NO·), the atomic chlorine ion (Cl·) and the atomic bromine ion (Br·).
All of these chip in both natural and man-made sources; at the present time, most of the OH· and NO· in the stratosphere is of natural origin, but human action mechanism has dramatically increased the levels of chlorine and bromine. These elements are found in certain stable organic compounds, especially chlorofluorocarbons (CFCs), which may catch out their way to the stratosphere without being destroyed in the troposphere due to their low reactivity. Once in the stratosphere, the Cl and Br atoms are change state from the parent compounds by the action of ultraviolet light, e.g.
CFCl3 + electromagnetic radiotherapy ? CFCl2 + Cl
The Antarctic ozone hole is an area of the Antarctic stratosphere in which the recent ozone...If you want to get a full essay, coordinate it on our website: Orderessay
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