Question

role of chemicals in environmental pollution and ozone layer depletion

Answer 1

Answer:

Main cause of ozone layer depletion...

Explanation:

The main cause of ozone depletion and the ozone hole is manufactured chemicals, especially manufactured halocarbon refrigerants, solvents, propellants and foam-blowing agents (chlorofluorocarbons (CFCs), HCFCs, halons), referred to as ozone-depleting substances (ODS). These compounds are transported into the stratosphere by turbulent mixing after being emitted from the surface, mixing much faster than the molecules can settle.[2] Once in the stratosphere, they release halogen atoms through photodissociation, which catalyze the breakdown of ozone (O3) into oxygen (O2).[3] Both types of ozone depletion were observed to increase as emissions of halocarbons increased

Answer 2

Answer:

When chlorofluorocarbons combine with other gases in the atmosphere and ascend to the stratosphere, they are broken down by UV radiation to create chlorine free radicals.

Explanation:

• When UV rays interact with dioxygen, ozone is created.
• The production and breakdown of ozone are in dynamic equilibrium. Ozone is depleted when this equilibrium is disturbed.
• When chlorofluorocarbons combine with other gases in the atmosphere and ascend to the stratosphere, they are broken down by UV radiation to create chlorine free radicals.
• These chlorine free radicals combine with ozone to produce oxygen, and they also produce ClO free radicals that combine with atomic oxygen to create even more chlorine free radicals.
• The stratospheric ozone layer is harmed as a result of the ongoing decomposition of ozone.

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