Table of Contents
- 1 What types of chemical pollutants are responsible for ozone depletion?
- 2 What chemical is responsible for damaging the ozone why did we use this chemical in the past?
- 3 How primary pollutants are responsible for ozone layer depletion explain it with the help of chemical reactions?
- 4 How do CFCs destroy ozone?
- 5 Where does ozone come from?
- 6 What is an ozone molecule formed from?
What types of chemical pollutants are responsible for ozone depletion?
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below).
What chemical is responsible for damaging the ozone why did we use this chemical in the past?
Molina discovered that chlorofluorocarbons (CFCs) could deplete Earth’s atmospheric ozone layer, which blocks the sun’s damaging ultraviolet rays. When the scientists reported their findings in 1974, CFCs were widely used as refrigerant gases and as propellants in aerosol sprays.
Where do CFCs come from?
The most common source of CFCs are refrigerants, but fire suppression systems for aircraft and aerosols also emit CFCs into the atmosphere.
What is the source of CFCs which cause ozone depletion?
Human activities cause the emission of halogen source gases that contain chlorine and bromine atoms. These emissions into the atmosphere ultimately lead to stratospheric ozone depletion. The source gases that con- tain only carbon, chlorine, and fluorine are called “chlo- rofluorocarbons,” usually abbreviated as CFCs.
How primary pollutants are responsible for ozone layer depletion explain it with the help of chemical reactions?
As explained above, the primary cause of ozone depletion is the presence of chlorine-containing source gases (primarily CFCs and related halocarbons). In the presence of UV light, these gases dissociate, releasing chlorine atoms, which then go on to catalyze ozone destruction.
How do CFCs destroy ozone?
Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules. When sunlight returns in the spring, the chlorine begins to destroy ozone.
What causes ozone depletion?
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).
How CFCs deplete the ozone layer?
Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules. See Ozone Depleting Substance.)
Where does ozone come from?
Where does ozone come from? Ozone is formed in the atmosphere through chemical reactions between pollutants emitted from vehicles, factories and other industrial sources, fossil fuels, combustion, consumer products, evaporation of paints, and many other sources.
What is an ozone molecule formed from?
Ozone is a molecule made up of three oxygen atoms, often referenced as O3. 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.
What are 3 causes of depletion to the ozone layer?
Which chemical released by CFC is harmful to ozone?
Chlorine released from CFCs destroys ozone in catalytic reactions where 100,000 molecules of ozone can be destroyed per chlorine atom. A large springtime depletion of stratospheric ozone was getting worse each following year.