Table of Contents
What is the mechanism of ozone depletion?
Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.
What are the reactions involved in ozone layer depletion?
The most reactive of these gases are chlorine monoxide (ClO), bro- mine monoxide (BrO), and chlorine and bromine atoms (Cl and Br). These gases participate in three principal reaction cycles that destroy ozone.
What is ozone layer depletion explain its mechanism and source?
Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules. One chlorine can destroy 100,000 molecules of ozone. It is destroyed more quickly than it is created.
How ozone depletion is an example of the action of a catalyst?
Chemistry of Ozone Depletion Chlorine is able to destroy so much of the ozone because it acts as a catalyst. Chlorine initiates the breakdown of ozone and combines with a freed oxygen to create two oxygen molecules. After each reaction, chlorine begins the destructive cycle again with another ozone molecule.
What are the 6 steps of ozone depletion?
The stratospheric ozone depletion process begins with the emission of halogen source gases by human activities and natural processes. Those emitted by human activities are also called ozone-depleting substances (ODSs). Subsequent steps are accumulation, transport, conversion, chemical reaction, and removal.
How does CFC react with ozone?
When chlorofluorocarbons (CFC) drift upwards towards the stratosphere, they come in contact with the Ozone layer. This leads to a chemical reaction where the CFC molecules are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules.
What is the chemical equation for ozone depletion?
ClO + O = Cl + O2 The ozone depletion is also referred to as the “ozone hole”, due to the fact that its reduction is not uniform, but mainly concentrated in the Antarctic region, with reductions up to 70 per cent.
What are the main sources of the reactants in the ozone forming reaction?
Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons. This reaction can occur both near the ground and high in the atmosphere.
What is the mechanism of formation of ozone in stratosphere?
Stratospheric ozone is formed naturally through the interaction of solar ultraviolet (UV) radiation with molecular oxygen (O2). The “ozone layer,” approximately 6 through 30 miles above the Earth’s surface, reduces the amount of harmful UV radiation reaching the Earth’s surface.
What is the chemical equation for ozone formation?
Each oxygen atom then quickly combines with an oxygen molecule to form an ozone molecule: O + O2 → O.
What is ozone layer chemical reaction?
How is ozone formed chemical reaction?
What is the mechanism of ground-level ozone formation?
How does ground-level ozone form? Tropospheric, or ground level ozone, is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC).
What is ozone layer Slideshare?
1. A molecule containing three atoms of oxygen is called ozone. Ozone is very rare in our atmosphere, averaging about three molecules of ozone for every 10 million air molecules. ozone plays a vital role in the atmosphere. It shields the entire Earth from much of the harmful UV radiation that comes from the sun.
How is ozone layer formed?
What is ozone how is it formed in atmosphere explain with equation?
Formation of Ozone : The UV radiations split molecular oxygen O2 apart into free oxygen atoms O + O. These atoms then combine with molecular oxygen to form ozone. O2 → O + O O + O2 → O3Effect : Ozone layer shields the surface of the earth from damaging UV radiations of the sun.
What is Chapman mechanism?
10.1 CHAPMAN MECHANISM The presence of a high-altitude ozone layer in the atmosphere was first determined in the 1920s from observations of the solar UV spectrum. A theory for the origin of this ozone layer was proposed in 1930 by a British scientist, Sydney Chapman, and is known as the Chapman mechanism.