Question

What is ozone layer. what are the diffrent causes for ozone deplicion. how is ozone formed?

Answer 1

Ozone Layer

What is the Ozone Layer?

Almost always the ozone has only been correlated with the hole in the ozone layer and the damages it has caused to the environment. The richness of the ozone layer that makes the hole so significant and the science behind the hole is far less popular. Schönbein in the year 1840 confirmed its existence and Jacques-Louis Soret rooted the chemical formula of ozone as O3 and proved that ozone is an allotropic form of Oxygen.

The importance of ozone is defined by the fact that it protects the earth from harmful ultraviolet rays from the sun. The ozone layer is found in the upper regions of the stratosphere where it protects the earth from the harmful ultraviolet rays of the sun. These radiations can cause skin cancer in the humans. The ultraviolet rays split the oxygen molecule into free oxygen atoms, these free oxygen atoms combine with the oxygen molecule to form ozone. This salient layer lies at distance of 12-15 miles beyond the earth surface.

The importance of ozone is defined by the fact that it protects the earth from harmful ultraviolet rays from the sun. The ozone layer is found in the upper regions of the stratosphere where it protects the earth from the harmful ultraviolet rays of the sun. These radiations can cause skin cancer in the humans. The ultraviolet rays split the oxygen molecule into free oxygen atoms, these free oxygen atoms combine with the oxygen molecule to form ozone. This salient layer lies at distance of 12-15 miles beyond the earth surface.



Ozone Layer Depletion – Ozone Hole

Preparation of ozone

This allotropic form of oxygen is formed by passing dry oxygen through a salient electric current. By doing so a part of the oxygen molecules undergo dissociation and then atomic oxygen gets associated with the oxygen molecule to give 5%-10% of the allotropic form of oxygen. The product obtained is called as ozonized oxygen.

O2        O+O

O2+O    →   O3

3O2↔2O3 – energy (endothermic reaction)

Ozone is unstable and decomposes to molecular oxygen. A dynamic equilibrium is maintained between the formation and decomposition of ozone. It has been found that this protective ozone layer is getting depleted because of the presence of CFC (chlorofluorocarbon) compounds.

When CFC is released into the atmosphere, they mix with atmospheric gases and reach the stratosphere. In presence of ultraviolet rays, they are broken down to form chlorine radicals. This chlorine radical reacts with ozone to form chlorine monoxide and oxygen molecule.

CF2Cl2 (g)      Cl (g) + CF2Cl (g) (Note: Cl is in the form of radical)

(Note: Cl is in the form of radical)

Cl (g) + O3 (g) → ClO (g) + O2 (g)

This reaction breaks down the ozone. CFC compounds are agents which release chlorine radical in the atmosphere and cause damage to the ozone layer.

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Answer 2

Answer:

Ozone layer is the outermist layer of the atmosphere with 3 molecules of oxygen ... It protects us from harmful UV rays ....

CFCS are the main cause of depletion of ozone layer .

When the uv rays fall on the ozone layer . It breaks into two parts .

o3 ---> o2 + o

this o forms bond with o2 to form o3

o + o2 --> o2

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