What is the main cause of depletion of ozone layer?
What is the main cause of depletion of ozone layer?
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). CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone’s ultraviolet radiation-absorbing capacity.
What depletes the ozone layer?
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).
What causes ozone depletion quizlet?
Ozone depletion occurs when chlorofluorocarbons (CFCs)—formerly found in aerosol spray cans and refrigerants—are released into the atmosphere. If not examine product labels to ensure that they do not contain ozone depleting substances such as CFCs or halons, HCFCs.
How do CFCs contribute to ozone depletion quizlet?
Ozone Depletion Ozone is destroyed by chlorofluorocarbons (CFC’s). CFC’s breakdown and release chlorine atoms which combine with O3 and break them down to O2. , CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing the chlorine that catalytically destroys ozone.
What effects can stratospheric ozone depletion have on environment?
Ozone depletion is a major environmental problem because it increases the amount of ultraviolet (UV) radiation that reaches Earth’s surface, which increases the rate of skin cancer, eye cataracts, and genetic and immune system damage.
What happens as the amount of ozone in the stratosphere decreases?
Ozone in the stratosphere absorbs most of the ultraviolet radiation from the Sun. Without ozone, the Sun’s intense UV radiation would sterilize the Earth’s surface. These reduced ozone levels have increased the amount of harmful ultraviolet radiation reaching the Earth’s surface.
Which of the following radicals are responsible for ozone depletion by CFCs quizlet?
In the stratosphere, anthropogenic chlorofluorocarbons (CFCs) react with high-energy ultraviolet radiation generating atomic chlorine radicals, which display a high level of reactivity towards ozone (O3). As a result, CFCs have been implicated as the primary cause in the depletion of the protective ozone layer.
Which of the following radicals are responsible for ozone depletion by CFCs?
chlorine radicals
How is good stratospheric ozone formed?
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.
How does the ozone layer help maintain ground level air quality quizlet?
How does the ozone layer help maintain ground-level air quality? The ozone layer absorbs a large portion of incoming UV radiation, which keeps ground-level ozone from forming. A higher percentage of UV radiation entering the troposphere would allow a greater amount of ozone to form in the troposphere.
Which if the following is not a health risk associated with a depleted ozone layer?
Respiratory illness is not a risk associated with a depleted ozone layer.
Which if the following is a health risk associated with ground level ozone?
The most appropriate answer is C. Because of diseases caused by ozone at the surface of the land most of the respiratory diseases one of which is, asthma, bronchitis, heart disease, or emphysema.
How does a small amount of chlorofluorocarbons can destroy a large amount of ozone?
Chlorine. When they are exposed to strong ultraviolet light, CFCs finally break down to release lone chlorine atoms with an unpaired electron. That’s why even small numbers of CFC molecules can destroy large quantities of ozone and remain active in the upper atmosphere for long periods of time.
Which refrigerant causes the least amount of damage to the ozone layer?
Hydrochlorofluorocarbons (HCFCs)
What can be used in place of R22?
R22 Alternative Options There are several refrigerants that do not cause the depletion of the ozone layer and that can be used as the alternatives for R22. Some of these are R-134a, R-507, R-404A, R-407c, and R- 410A. Refrigerant 507 is the azeotropic mixture comprising 50% of R-125 and 50% of R-134a.
Which of the following is an approved drop in service replacement for R22?
As a matter of fact, there are many different alternatives to R-22 that don’t deplete the ozone layer, including: R-134a, R-507, R-404A, R-407c and R-410A. R-410A is the best alternative option for air conditioning applications, while the best alternative for refrigeration applications are R-404A and R-507.
What is the replacement for R410A?
R-32