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Access the answers to hundreds of Ozone layer questions that are explained in a way that's easy for you to understand. The global recognition of the destructive potential of CFCs led to the 1987 Montreal Protocol, a treaty phasing out the production of ozone-depleting chemicals. The Federal Water Pollution Control Act of 1948 was the first federal action regarding water pollution and provided technical assistance but nothing else. The CFCs remain enclosed within the cells of the plastic and increase the thermal insulation of the air-filled foams. is catalyzed through a free chlorine (Cl) atom. The stratospheric ozone is a naturally occurring atmospheric gas that forms the ozone layer that protects the Earth from catastrophic ultraviolet rays produced by the sun. Since the stratospheric ozone layer helps protect all of Earth and society from the ultraviolet radiation given off from the sun it is crucial that we all do our part to help protect the environment that we live in. https://quizlet.com/124687089/apes-pollution-test-flash-cards The environmental concern for CFCs follows from their long atmospheric lifetime (55 years for CFC-11 and 140 years for CFC-12, CCl 2 F 2) 9 which limits our ability to reduce their abundance in the atmosphere and associated future ozone loss. CFCs are particularly harmful when released into the atmosphere because of their destructive reaction with O-zone particles, which provide the … The main effect of ozone depletion is an increase in UV-B rays reaching the earth's surface.. The Montreal Protocol on Substances that Deplete the Ozone Layer (the Montreal Protocol) is an international agreement made in 1987. a. carbon dioxide and water b. nitrogen oxides and sulfur compounds c. water vapor and sulfur compounds d. carbon dioxide and NOx. Trichlorofluoromethane, or CFC-11, hurts the ozone layer and was phased out of production by 2010. Thus, the ODP of CFC-11 is defined to be 1.0. Fossil fuels contribute to global warming by releasing CO2 and other greenhouse gases when they are burned along wit the energy released. use of chlorofluorocarbons (CFCS) What most likely happens when a cold air mass comes into contact with a warm, moist air mass? Ozone (O 3) is a gas which is present naturally within Earth’s atmosphere.It is formed of three oxygen atoms (giving it the chemical formula, O 3).Its structure means that it’s much less stable than oxygen (O 2), and is therefore much more reactive; this means it can be more easily formed and broken down through interaction with other compounds. "The gas molecules undergo chemical changes and once they do, looking at them after they've mixed and changed in the atmosphere doesn't give an accurate picture of their effect," Shindell said. Ozone is a gas made up of molecules with three oxygen atoms. Never use an open flame to heat a refrigerant tank because. The ODP is the ratio of the impact on ozone of a chemical compared to the impact of a similar mass of CFC-11. Chlorofluorocarbons are man-made chemicals with many industrial applications that were commonly used in refrigeration and air-conditioning systems in the mid-20th century. sewage-borne bacteria caused infectious diseases. Further research by Montzka showed that the recovery of the ozone hole could be delayed because of these emissions. II. Explain why the chlorine atoms liberated from CFCs are thought to be a serious threat to the ozone … causing disease. These atoms react with ozone and destroy it. 15 Practice Exam | Quizlet 7/13 21. CFCs account for about 13% of the total energy absorbed by human-produced greenhouse gases. Each of the O atoms can react with unsplit O 2 to make O 3 (ozone). CFCs and HCFCs also warm the lower atmosphere of the earth, changing global climate. - series of chem reactions that happen after the cars give out pollution. Effect of Temperature on Ozone Depletion. The Montreal Protocol has also evolved over time to adjust to a changing environment. It mandated the gradual phasing out of chlorofluorocarbons (CFCs) and other ozone-depleting chemicals. Beneficial ozone is present naturally in the Earth’s upper atmosphere, 10–30 miles above the Earth’s surface. The Ozone layer is a deep blanket in the stratosphere made up of comparatively high concentration of the ozone. The United States already has phased out the ozone depleting substances that Congress identified as "most damaging," such as CFCs and halons. heat. We want to extend a warm W&M welcome to our new students moving in this week, and can’t wait to kick off a new semester with all of our students - both near and far - next week. Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, ozone and some artificial chemicals such as chlorofluorocarbons (CFCs). Scientists first began to realize the potential for chlorine to interact destructively with ozone in the early 1970s, and Sherwood Rowland and Mario Molina warned of the danger that CFCs posed to the ozone layer in 1974. The ultimate Called stratospheric ozone, good ozone occurs naturally in the upper atmosphere, where it forms a protective layer that shields us from the sun's harmful ultraviolet rays. -CFC get stuck in band of winds (PV) and break down ozone additional ozone destruction special high-altitude polar clouds provide reaction surfaces at just the right altitude for ozone destruction C. Ozone can be good or bad, depending on where it is found. It was designed to stop the production and import of ozone -ozone formation: one of main contributors to smog. -Urban air pollution: brownish-orange haze. How Do CFCs Damage the Ozone?. Starting in the early 1970's, however, scientists found evidence that human activities were disrupting the ozone balance. It only takes about five years for atmospheric wind currents to bring molecules up to the stratosphere which is where the CFC molecules end up, leading to ozone depletion. Get help with your Ozone layer homework. Chemical reactions on the surfaces of ice crystals in the clouds release active forms of CFCs. 20 miles. CFCs were also used in the production of many foamed plastics. The phase-out for Class I substances was implemented 4-6 years faster, included 13 more chemicals, and cost 30 percent less than was predicted at the time the 1990 Clean Air Act Amendments were enacted. As a result of its chemical composition, ozone is regarded as a special type of oxygen as it contains three oxygen molecules (O3) as opposed to the usual two oxygen molecules (O2). Good ozone is continually created and destroyed by a number of complex chemical reactions. Acid deposition. The Largest Ozone Holes Are Often Associated with The Coldest Winters For the Antarctic ozone hole, there is a clear link between the additional amount of chlorine injected into the stratosphere, the additional polar ozone loss and the delay to recovery. CFCs are broken down by UV photolysis, but the process takes a long time since it takes decades to cycle all of the air in the troposphere through the upper stratosphere. Causes: chlorofluorocarbon (CFCs), halons, and other compounds deplete the ozone layer.These chemicals are found in cleaning agents, aerosols, insulating foam, and refrigerants. The ozone hole itself has a minor cooling effect (about 2 percent of the warming effect of greenhouses gases) because ozone in the stratosphere absorbs heat radiated to space by gases in a lower layer of Earth’s atmosphere (the upper troposphere). Another negative effect is the reduced lifespan of certain materials. C) refrigerant in the tank may decompose, forming a toxic … III. More information on the phaseout of ODS is found here . If a freed atom collides with another O2, it joins up, forming ozone O3. The ozone layer is a high level layer of gas in the stratosphere. The Clean Air Act of 1990 also placed new regulations on automobile emissions. , CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing the chlorine that catalytically destroys ozone. The breakdown of stratospheric ozone. Ozone Layer Questions and Answers. Start studying APES Chapter 15 Study Guide. The occurrence of this gas is in the upper atmosphere of Earth as well as on the ground level. Human production of chlorine-containing chemicals such as chlorofluorocarbons (CFCs) has added an additional factor that destroys ozone. It is found in the lower atmosphere (troposphere) and has nothing to do with the "ozone hole." One of the greatest factors that affect ozone depletion is the temperature of the air. is catalyzed through a free chlorine (Cl) atom. Carbon dioxide (CO2) , Methane (CH4), Water Vapor (H2O) ,Nitrous Oxide (N2O), Ozone (o3), and chlorofluorocarbons (CFCs). hazardous air pollutants quizlet . Strong ultraviolet light breaks apart the CFC … A) UV radiation frees a chlorine atom, which breaks down ozone B) Infrared radiation frees a chlorine atom, which breaks down ozone C) UV radiation frees a fluorine atom, which breaks down ozone D) Infrared radiation frees a chlorine atom, which breaks down ozone They damage the 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). Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and halons destroy the earth's protective ozone layer, which shields the earth from harmful ultraviolet (UV-B) rays generated from the sun. Ozone can be beneficial or harmful to people, depending where it occurs. prevents UV … Because CFC molecules can linger for as long as a century, their effects are not yet over.But the level of chlorine from CFCs in the atmosphere has already begun to fall,indicating that the CFC ban will have positive,long-term effects on the global environment.Current data predict that the ozone holes should shrink and disappear within 50 years. This process is called the Chapman cycle. Synthetic compounds entirely of industrial origin used in a number of applications, but now largely regulated in production and release to the atmosphere by international agreement for their ability to contribute to destruction of the ozone … This beneficial ozone has been How far above the Earth would we find the highest concentration of "good" ozone? When the Sun’s energy reaches the Earth’s atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. While HFCs do not deplete the ozone layer, they are powerful greenhouse gases (GHGs) that contribute to climate change. High level or “good” ozone occurs in the stratosphere and accounts for the vast majority of atmospheric ozone. Supposedly. A. UV radiation frees a chlorine atom, which breaks down ozone. The ozone layer is expected to return to normal levels by about 2050. The Montreal Protocol The Montreal Protocol on Substances that Deplete the Ozone Layer is the landmark multilateral environmental agreement that regulates the production and consumption of nearly 100 man-made chemicals referred to as ozone depleting substances (ODS). In 2014, these restrictions were extended to H-FC gases because of their high global warming potential . But it was used a lot by the media during the 1980s and 1990s to refer to the spray cans that released chlorofluorocarbons (CFCs) into the air, which damage the ozone layer and created the ozone hole. Renewed production and emission of CFC-11 will delay the recovery of the ozone layer. see page 94. The most severe case of ozone depletion was first documented in 1985 in a paper by British Antarctic Survey (BAS) scientists Joseph C. Farman, Brian G. Gardiner, and Jonathan D. Shanklin. Ozone-depleting substances are present throughout the stratospheric ozone layer because they are transported great dis-tances by atmospheric air motions. Ozone molecules are made up of three atoms of oxygen instead of the usual two atoms that make up normal atmospheric oxygen. Recovery of the ozone layer. C) virgin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. III. Solving the Problem of Ozone Destruction. Explain why the radiant energy found in the troposphere is unable to liberate chlorine atoms from CFC molecules but the radiant energy in the stratosphere is able to do this. The CFCs remain enclosed within the cells of the plastic and increase the thermal insulation of the air-filled foams. 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. CFCs are compounds made up of chlorine, fluorine and carbon bound together. The kind of oxygen we breathe has two. Chlorofluorocarbons, also known as CFCs, consist of chemical compounds made up of chlorine, fluorine and carbon. It set targets for reducing the emissions of hydrocarbons and nitrogen oxides by … It takes years for CFCs and other ozone-depleting compounds to reach the stratosphere. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc. The ban came into effect in 1989. Hydrofluorocarbons (HFCs) also act to warm the planet. The chlorine atom released from a CFC wreaks havoc on ozone molecules. After a period of several years, CFC molecules reach the stratosphere, about 10 kilometers above the Earth's surface, where the ozone layer is. The severe depletion of the Antarctic ozone layer known as the “ozone hole” occurs because of the special atmospheric and chemical conditions that exist there and nowhere else on the globe. When temperatures drop below -78°C (-109°F), thin clouds form of ice, nitric acid, and sulphuric acid mixtures. chapters 12, 18-20. This natural ozone shields us from the sun’s ultraviolet rays. This is a trick question! But a NOAA study says CFC-11 emissions began to rise after 2012. In addition, UVB has been linked to the development of cataracts, a clouding of the eye’s lens. How do CFCs affect ozone production? Trichlorofluoromethane, or CFC-11, hurts the ozone layer and was phased out of production by 2010. Ozone layer: Banned CFCs traced to China say scientists. The ozone layer is expected to return to normal levels by about 2050. -formed by reactions of sunlight, nitrogen oxide, and hydrocarbons. As a result of CFCs phase-out, recent years have seen a growth of hydrofluorocarbons (HFCs) in air conditioning and refrigeration systems. Ozone (O 3) is a reactive gas that exists in two layers of the atmosphere: the stratosphere (upper layer) and the troposphere (at ground level and up to 15km).In the stratosphere, ozone protects life on Earth from the sun’s ultraviolet radiation. Learn more about the current status of the ozone layer. Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. Under the original Montreal Protocol agreement (1987), developed countries were required to begin phasing out CFCs in 1993 and achieve a 20% reduction relative to 1986 Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and halons destroy the earth's protective ozone layer, which shields the earth from harmful ultraviolet (UV-B) rays generated from the sun. CFC-11 was primarily used for home insulation but global production was due to … An example is CFC-12 (CCI2F2), used as a refrigerant in refrigerators and air conditioners and as a foam blowing agent. These emissions would be in violation of the Montreal Protocol, the international treaty designed to phase out the production and consumption of CFCs and other ozone-damaging chemicals. Recycling is one way to reduce waste. An animation shows a single ozone molecule, made of three oxygen atoms. Researchers say that they have pinpointed the major sources of a mysterious recent rise in a dangerous, ozone-destroying chemical. Hydrofluorocarbons (HFCs) also act to warm the planet. -enhanced by inversions. The Montreal Protocol - factsheet Introduction to the Montreal Protocol The Montreal Protocol on Substances that Deplete the Ozone Layer (the Montreal Protocol) is an international agreement made in 1987. CFCs are extremely stable, and they do not dissolve in rain, so they stay in the atmosphere and some of them gradually gain height. UV radiation frees a chlorine atom, which breaks down ozone A) it can result in venting refrigerant to the atmosphere. CFCs, or chlorofluorocarbons, are normally stable molecules, but when UV rays strike them, they are broken down. Ozone is produced naturally in the stratosphere when highly energetic solar radiation strikes molecules of oxygen, O2, and cause the two oxygen atoms to split apart in a process called photolysis. The original Montreal Protocol, signed in 1987, was the first step in international efforts to protect stratospheric ozone. It was designed to stop the production and import of ozone depleting substances and reduce their concentration in the atmosphere to help protect the earth’s ozone … Other CFCs and HCFCs have ODPs that range from 0.01 to 1.0. After the Montreal Protocol was signed, new data showed worse-than-expected damage to the ozone layer. Ozone is made up of a combination of three oxygen atoms. The greenhouse effect happens when certain gases, which are known as greenhouse gases, accumulate in the Earth's atmosphere.Greenhouse gases include carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N 2 O), ozone (O 3), and fluorinated gases.. Greenhouse gases allow the sun's light to shine onto the Earth's surface, and then the gases, such as ozone, trap the heat that reflects back … This concentration of CFC-11 was perhaps the result of unauthorized industrial production, going against the Montreal Protocol. B) the tank may explode, causing serious injury to people nearby. Write the series of chemical reactions that were proposed by Sherwood Rowland and Mario Molina to explain ozone depletion by CFCs. The Montreal Protocol, an international agreement to address the global problem of ozone destruction, was signed by more than 70 countries in 1986. Move-In looks a little different this year, and we know there are mixed emotions right now. released into the atmosphere do not. I. can originate from the emission of chlorofluorocarbons (CFCs). CFCs are already known to deplete ozone, but in-depth statistical analysis now shows that CFCs are also the key driver in global climate change, rather than carbon dioxide (CO2) emissions. The strength of CFC absorption bands and the unique susceptibility of the atmosphere at wavelengths where CFCs (indeed all covalent fluorine compounds) absorb creates a “super” greenhouse effect from CFCs and other unreactive fluorine-containing gases such as perfluorocarbons, HFCs, HCFCs, bromofluorocarbons, SF 6, and NF 3. 4/12/2021 Test: APES Ch. 22. CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone’s ultraviolet radiation-absorbing capacity. Ozone depletion is primarily caused by human activities. Near the ground, ozone forming as a result of chemical reactions involving traffic pollution and sunlight may cause a number of respiratory problems, particularly for young children. The top two equations show how ozone is produced in the stratosphere. CFCs have been responsible for depleting the ozone layer as they attack and destroy ozone molecules. Stratospheric Ozone Depletion. … 23. deforestation ocean release cement production industrial activity (generation of coal) motor vehicles How do CFCs affect ozone production? The greenhouse effect is a natural process that warms the Earth’s surface. Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Ozone is found in two different parts of our atmosphere. Each chlorine atom would react immediately with an ozone molecule, setting off a chain reaction that would destroy thousands of ozone molecules. The basics of the science of strato-spheric ozone and its depletion by chlorofluorocarbons (CFCs) are illustrated schematically in figure 1. Where are CFCs banned? It set goals of reducing CFC production 20% by 1993 and 50% by 1998. TIM: The ozone layer is a part of Earth's atmosphere where a high concentration of this gas protects us from the sun's powerful ultraviolet radiation. In layman's terms: Pollution from ground level all the way up to the highest levels of the atmosphere is neutralized by Ozone, which then turns back into pure oxygen. Specifically, the analysis points to new emissions of CFC-11, CFC-12, and CFC-113. CFCs and HCFCs also warm the lower atmosphere of the earth, changing global climate. [3] The production of these materials using CFCs began to decrease when the connection between CFCs and the destruction of the ozone layer became public in 1974. The breakdown of stratospheric ozone I. can originate from the emission of chlorofluorocarbons (CFCs). The halons have ODPs ranging up to 10. Ozone is both beneficial and harmful to us. The ozone layer is created when ultraviolet rays react with oxygen molecules (O 2) to create ozone (O 3) and atomic oxygen (O). The effects of burning fossil fuels include the production of acid rain and an increased greenhouse effect. In contrast, at lower levels, it is an important greenhouse gas and air pollutant, which is harmful to human and ecosystem health. CFCs were also used in the production of many foamed plastics. These concerns led to the adoption of the Montreal Protocol in 1987, which bans the production of CFCs, halons, and other ozone-depleting chemicals. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development. Which of these has been controlled in an attempt to reduce the depletion of ozone in Earth's atmosphere? In the late 1800s, it was showed that. II. But, it is very important that the world comply with the Montreal Protocol; delays in ending production and use of ozone-depleting substances could cause additional damage to the ozone layer and prolong its recovery. Ozone-depleting substances only affect the stratospheric ozone layer. Q. Supposedly. The Ozone Layer is located within the Ozonosphere within the Stratosphere. Ground level or “bad” ozone is a human health irritant and component of smog. 20. The molecules of chlorofluorocarbons in the stratosphere are broken down by the ultraviolet radiations and release chlorine atoms. Step 1: An oxygen molecules is photolyzed by solar radiation, creating two oxygen radicals: (7.3.1) h ν + O 2 → 2 O. Alternative & Holistic Health Service. B. Infrared radiation frees a chlorine atom, which breaks down ozone. Considering this, where is most of the ozone layer located quizlet? This danger is a direct consequence of the fact that CFCs -- which contain carbon, fluorine and chlorine -- are so inert. CFCs affect the ozone layer by destroying ozone molecules. But a NOAA study says CFC-11 emissions began to rise after 2012. A distinction must be made between ozone in the stratosphere – the part of the atmosphere about 15 km above the earth’s surface (commonly referred to as the ozone layer) – and ground-level ozone. When released to the atmosphere, those chemicals damage the stratospheric ozone layer, Earth’s protective shield that … Methane (CH 4) is a greenhouse gas that is much stronger than carbon dioxide (CO 2 ), 34 times stronger if compared over a 100-year period. While concentrations of methane … Ozone depletion begins, and the ozone "hole" appears. Ultraviolet (UV) light splits an O 2 molecule into two O atoms (photodissociation). No one knows for certain how much more ozone depletion will occur. Carbon tetrachloride has an ODP of 1.2, and methyl chloroform's ODP is 0.11. CFC's breakdown and release chlorine atoms which combine with O3 and break them down to O2. There is a substantial time lag between the time when ODS emissions begin to decline and the point at which the ozone layer begins to recover. The European Union Regulations 1 have planned and implemented the phasing out of the CFC and H-CFC fluorinated gases between 1995 and 2015 because of their effect on the ozone layer (see table). CFCs can only be destroyed by extremely energetic ultraviolet radiation, such as is found above most of the ozone layer. Ozone is a colorless gas found in the air we breathe. The creation of NOx requires nitrogen, oxygen, and. In their paper, they estimated that if CFC use was banned immediately, ozone loss would go on for years. Chlorofluorocarbons (CFCs). In 1992, the Parties to the Protocol decided to alter the terms of the 1987 agreement to end production of halons by 1994 and CFCs by 1996 in developed countries. [3] The production of these materials using CFCs began to decrease when the connection between CFCs and the destruction of the ozone layer became public in 1974. 21. Act of 1972? Montreal Protocol factsheet For key facts and information at a glance, please read our Montreal Protocol factsheet. Learn more about the current status of the ozone layer. Despite this, Montzka doesn’t believe that the ozone layer is facing a significant risk from CFCs. If CFC production continued, however, ozone loss would be even greater. Ozone occurs both in the Earth's upper atmosphere and at ground level. Antarctic ozone hole. This resulted in the Copenhagen Amendment that further limited production and was approved later in 1992. Low temperatures create polar stratospheric clouds that lead to the production of free radicals of chlorine, which result in the breakdown of ozone at the beginning of the antarctic spring. The word “aerosol” is used by scientists to mean “atmospheric particulate”. smog. Ozone is a gas composed of three atoms of oxygen (O3). But, it is very important that the world comply with the Montreal Protocol; delays in ending production and use of ozone-depleting substances could cause additional damage to the ozone layer and prolong its recovery.

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