Science cfc ace
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CFCs (chlorofluorocarbons) are man-made substances that were formerly used in refrigerants and aerosol sprays. CFCs deplete the ozone layer by breaking ozone molecules into their constituent oxygen atoms. When UV radiation hits a CFC molecule, it releases a chlorine atom that catalyzes the breakdown of many thousands of ozone molecules. International agreements like the Montreal Protocol have led countries to phase out CFC production to allow the ozone layer to recover. While CFCs are being removed from the atmosphere, their long lifetime means they continue to impact the ozone layer. Public awareness of products containing CFCs and support for initiatives that protect the ozone layer can help address
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Science cfc ace
CFCs (chlorofluorocarbons) are man-made substances that were formerly used in aerosols and refrigerants. CFCs deplete the ozone layer by breaking ozone molecules into oxygen when exposed to ultraviolet radiation. A single CFC molecule can destroy 100,000 ozone molecules in its lifetime. An international agreement called the Montreal Protocol was implemented to phase out CFC production and allow the ozone layer to recover. While CFCs are being eliminated, continued monitoring is important to ensure protection of the ozone layer.
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ozone depletion
Ozone layer depletion is one of the major environmental issues which is getting thinner day by day as a result of increasing pollution.
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Ozone in the stratosphere protects the Earth from harmful UV rays but its concentration is being reduced by ozone-depleting pollutants like CFCs and NOx. CFCs were commonly used in aerosol sprays and refrigerants until they were banned, but their effects will persist for a long time. When CFCs and NOx reach the stratosphere, their breakdown releases chlorine and nitrogen atoms that catalyze the destruction of ozone molecules, reducing the protective ozone layer. Alternatives to CFCs without chlorine, like HFCs and HCFCs, have been developed to prevent further ozone depletion.
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An ozone layer located 20-25 km above the earth's surface absorbs harmful ultraviolet radiation from the sun, protecting life on earth. Ultraviolet rays decompose oxygen into atomic oxygen, which then combines with molecular oxygen to form ozone. However, chlorofluorocarbons (CFCs) released into the atmosphere destroy ozone molecules. One chlorine atom can destroy up to 100,000 ozone molecules over time. The Montreal Protocol was formed to phase out the production of CFCs and other ozone-depleting substances.
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The document discusses the ozone layer and its depletion. It begins by defining ozone and describing where it is located in the atmosphere, forming an important protective layer. It then explains that ozone depletion is primarily caused by chlorofluorocarbons and other ozone depleting substances released into the air. This leads to increased UV radiation reaching the Earth's surface and causes problems like skin cancer, as well as broader issues like global warming. International agreements like the Montreal Protocol have helped phase out the harmful substances and allow the ozone layer to recover over time.
Ozone Depletion
The document discusses the importance of the ozone layer in protecting life on Earth from harmful UV rays. It explains that while the ozone layer formed naturally, human activities involving chemicals like CFCs are depleting it. The effects of ozone depletion include increased UV radiation at the surface. International agreements have sought to regulate emissions and find alternatives to ozone-depleting substances. The document also discusses the formation of ozone holes over the Arctic and Antarctic regions.
Greenhouse effect global worming
Ozone layer depletion occurs when ozone-depleting substances like CFCs break down ozone molecules in the stratosphere. This allows more ultraviolet radiation to reach the Earth's surface, increasing health and environmental risks. The ozone hole was first detected in 1975 and grew substantially in size through the 1980s and 1990s before stabilizing due to the Montreal Protocol banning CFCs. Global warming occurs when greenhouse gases like carbon dioxide trap heat in the lower atmosphere, increasing average surface and lower atmospheric temperatures globally over long periods of time. Both phenomena pose risks but international agreements have led to reductions in their drivers.
Option 1 b.5
1) Ozone in the stratosphere protects the Earth from harmful UV radiation but was being depleted by CFCs.
2) CFCs were stable in the lower atmosphere but broken down by UV radiation in the stratosphere, releasing chlorine atoms that destroy ozone molecules and cause chain reactions.
3) The discovery of the ozone hole over Antarctica in 1984 showed the damage caused by CFCs to the ozone layer.
Ozone depletion (preetamm iiserb)
1) The document discusses the ozone layer and the effects of ozone depletion on human health and the environment.
2) It describes how chlorofluorocarbons (CFCs) released chemicals that destroy the ozone layer, increasing UV radiation levels and potentially causing skin cancer, cataracts, and other negative impacts.
3) International agreements like the Montreal Protocol have sought to phase out CFCs and other ozone-depleting substances to allow the ozone layer to recover over time.
Ozone Depletion
Ozone depletion describes a decline in stratospheric ozone levels since the 1970s, with a seasonal ozone hole forming over Antarctica each spring. The primary cause is chlorine and bromine atoms released from man-made chemicals like CFCs. In polar regions, ozone depletion is greatly enhanced by reactions on surfaces of polar stratospheric clouds that convert stable reservoir compounds into reactive radicals, catalytically destroying ozone. The Antarctic ozone hole forms each spring when sunlight drives these reactions after polar stratospheric clouds form over the winter.
Ozone depletion (2)
Ozone depletion refers to two phenomena: a slow 4% per decade decline in total stratospheric ozone and a larger seasonal decrease over polar regions known as the ozone hole. The main cause is catalytic destruction of ozone by chlorine and bromine from chlorofluorocarbons (CFCs) released into the atmosphere. In polar regions, ozone depletion is greatly enhanced by reactions on polar stratospheric clouds, leading to severe thinning over Antarctica known as the ozone hole. Increased UV exposure due to ozone depletion is suspected to increase risks of skin cancer and damage to plants and marine life.
C6e Ozone Layer
The document discusses chlorofluorocarbons (CFCs) and their impact on the ozone layer. It notes that CFCs contain chlorine, fluorine and carbon atoms and were originally used as refrigerants and aerosol propellants. However, scientists later discovered that CFCs deplete the ozone layer by releasing chlorine atoms when broken down by UV light, triggering a chain reaction that destroys ozone molecules. As a result, CFCs have been banned internationally to help stop further ozone layer depletion.
Chem
The ozone layer protects the Earth from harmful UV rays, but it has been depleted due to man-made chemicals like CFCs. CFCs remain stable in the atmosphere until reaching the stratosphere, where high-energy photons break them down and release chlorine radicals. These radicals catalytically destroy ozone through reactions that convert it into oxygen. One chlorine radical can destroy thousands of ozone molecules through this cyclic process. The natural Chapman cycle continually creates and destroys ozone, but human activities have increased ozone depletion beyond natural levels.
Topic ozone deplation final ppt
The document discusses ozone depletion and the ozone layer. It defines ozone and how it forms, and describes the ozone layer's location and role in protecting the Earth. It then discusses the discovery of the ozone hole, the causes of ozone depletion including CFCs, and solutions implemented through the Montreal Protocol to phase out ozone-depleting substances and allow the ozone layer to recover by 2050.
The thinning of the ozone layer
The document summarizes information about the ozone layer, including:
- The ozone layer is a region of the stratosphere that absorbs UV radiation and protects the Earth. It contains high concentrations of ozone relative to other atmospheric gases.
- Ozone is created through interactions between oxygen molecules and UV light in the stratosphere. Chlorofluorocarbons (CFCs) released chemicals like chlorine that deplete the ozone layer by catalyzing the breakdown of ozone molecules.
- Significant ozone depletion occurs seasonally over Antarctica, forming an "ozone hole." The discovery of the Antarctic ozone hole in 1985 prompted international agreements to phase out ozone-depleting substances like
Ozone layer depletion
This document discusses the ozone layer and its depletion. It begins with an introduction to the discovery of ozone layer depletion by scientists in the 1970s. It then discusses the formation and location of stratospheric and tropospheric ozone. The main causes of ozone layer depletion are chlorofluorocarbons (CFCs) and other ozone depleting substances like halons. The impacts of depletion include increased UV radiation reaching Earth's surface, harming human health, agriculture and plants. International agreements like the Montreal Protocol have sought to phase out the production and use of ozone depleting substances to protect the ozone layer.
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Science cfc ace
- 1. By: Brian K Chen
- 5. Atoms and elements Oxygen -1 oxygen atom is not very important -2 oxygen atoms=the oxygen in the air we breathe -3 oxygen atoms=an ozone molecule Flourine Carbon Chlorine
- 6. The natural way Normally, the process of producing ozone is very balanced One ozone molecule breaks into two oxygen atoms and one oxygen atom. The two oxygen atoms joins with one oxygen atom form another ozone molecule The one oxygen atom joins with two oxygen atoms to form another ozone molecule. The process is very balanced.
- 7. What is the ozone layer The ozone layer is part of the stratosphere and is made mostly by one element, oxygen. Ozone itself is a substance. One ozone molecule is made of 3 oxygen molecules. The Ozone layer is part of the stratosphere which is one section of the atmosphere Without the ozone layer, we would be exposed to ultra-violet radiation from the sun. This would cause widespread skin cancer and other problems
- 8. What is the common perception
- 10. Where do CFCs come from coolants such as refrigerators and air conditioners. Aerosols like antiseptic sprays
- 11. The scientific truth Chloroflouro carbons can be written as CF3Cl The C is carbon-1 atom F is Flourine-3 atom Cl is Chlorine-1 atoms After ultraviolet radiation from the sun, one chlorine atom breaks off we have CF3+Cl The single Chlorine atom is the most dangerous.
- 12. The scientific truth The single chlorine atom will, after it has broken off, combine with ozone molecule and break it into 1 oxygen atom and one oxygen molecule with two atoms. Then it will combine with one of the oxygen atoms.
- 13. The scientific truth After wards, the combination will combine with an oxygen atom and break down into another oxygen molecule. The following word equations explains this
- 14. The result The process was balanced but now the CFCs are causing ozone molecules to be destroyed faster than they are being created That is real bad
- 15. Why is the CFC so dangerous The problem is how long it takes for a CFC molecule to leave the stratosphere Normal physical means cannot get rid of it On average, one CFC molecule can destroy 100,000 Ozone molecules in its life time There are only a few ways of getting rid of it
- 16. How is the CFC gotten rid of When the chlorine atom collides with other molecules such as hydrocarbons, it forms hydrogen chloride which can leave the atmosphere dissolved in water. Other way is to let the atom slowly drift out
- 17. What has been done There is the Montreal protocol -It links countries together -In this agreement, they all set aims together to cut producing of CFCs -Singapore is included -It has been changed many times to improve it
- 18. What should we do????? We should check if the goods we buy such as refrigerators don’t have CFC Do projects like this to raise public awareness
- 19. Interesting facts In some urban areas although the ozone layer is thinner, there is actually less Ultra-violet radiation reaching the ground This is because of pollution The carbon dioxide and smog in the air actually helps to block the ultra-violet radiation!!!
- 20. Sources Wikipedia Collins advanced science chemistry http://answers.ask.com/Science/Nature/where_do_cfc_come_from