Wednesday, August 26, 2020
The Best Essay Writing Service Available On The Internet
The Best Essay Writing Service Available On The Internet The updates can help you to trace the progress of your order, and contribute to a excessive-high quality paper. As for the revisions, we perceive that even the most effective essay author on-line can make errors once in a while. This is why our customers get a number of chances to ask for enhancements and changes to their work. We are solely accomplished with the paper if you are fully happy. Nonetheless, when you ever doubt your capability to work on the assignment, think about working with an skilled essay author from our firm. We have sturdy guarantees and policies that will make sure that you get a superior paper, written consistent with your prompt. The on-line essay writing help will provide samples of earlier work. You might notice that a author doesnât offer a good deal of examples, however as a substitute offers a common concept of what a good essay should be to you. In common, you will need to know tips on how to accurately cite sources and use an appropriate format. Of course, there will be other more specific necessities, relying on the character of the project. Money is taken into account an necessary consider any situations; could or not it's emergency or regular and in needs to be identified before continuing for the deal. As a pupil, we all know you've restricted funds and restricted finances for this essay writing function. Ordering an essay with us is your quickest route to success, donât want till itâs too late, do it now for the best value and best selection of writers. Save yourself the stress of writing at the last minute, or the stress of not having time to place collectively a high-notch essay within the time frame youâve been given. Use our professional group to help, guide, and help you to a shiny future. Whether you want a easy five-paragraph essay of a 60-web page dissertation, we have your again. We also provide reasonably priced proofreading and enhancing services. Our clients benefit from common drafts and free revisions. Be positive to read the pattern over and see what you think. Essay writing help in Australia may help you acquire perception into the method of writing an essay. The essay writing help might permit you to see examples of essay writing that other writers have done. So you will get an thought of what itâs like to write down an essay. However, that was a special scenario then and now the hardships are altering for the scholars. If noticed keenly, essay writing is the one medium where one can express his or her thoughts freely and can take a stand for one thing which they honestly imagine in strongly. and forums, where you'll be able to examine the evaluations for numerous thesis writing service websites out there in the market. Not only you can learn the best essay writing service critiques of various sites, but you can also ask questions related to a specific website and get the reply. A service which seeks entry to various unimportant things corresponding to contacts, gallery, saving search history and caches, automatic password saving, your location, etc should not be thought-about. Our essay author service also ensures on-time delivery. We know that you've got other commitments to handle and should not be worrying over delayed submissions. This is why we've developed and carried out a strict policy on timeliness. It doesn't matter how close your deadline is â" your paper will arrive on time. There are these papers that it is possible for you to to complete with ease, while others may be relatively complicated. The entire writing work is done mutually by students and the skilled writers which entails equal contribution and understanding of the students. While here on this process, the coed is helped completely by making him or her perceive the topic and solving the queries. Here, the student features data, fulfilling the universityâs function behind the task in addition to the scholar is able to score the grades with justified sources. It is lawfully recognized and legit to assist someone in need with oneâs information. This is the explanation; it is advisable to seek the advice of multiple essay writing service suppliers and know their charges and expertise before keeping a hand on the first one which you come across. You can examine and choose the best one as per your wants and requirements before taking an opportunity. Avoiding this step can cost you a fortune in excessive conditions.
The Best Essay Writing Service Available On The Internet
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Tuesday, June 2, 2020
Laws and media report - Free Essay Example
1) Identify the area of laws that are relevant to the chosen media report, and explain how they are relevant to the matters outlined in the report. This media article commentates about the link-up between the radio station of Macquarie Radio Network and that of Fairfax Mediaââ¬â¢s Radio Business. The ACCC (Australian Competition and Consumer Commission) authorized the merger. The ACCC encourages competition and legal and equitable trade in the market to profit businesses, the community and consumers. They are Australiaââ¬â¢s competition regulator and National Consumer law champion (Australian Competition and Consumer Commission 2015). Administrative law In order for the merger to take place, it should undergo various processes. Each company should apply for a licence providing all appropriate details in order to be able to operate legally in the future. The body that is responsible for handling all the rules of the paperwork is the ACCC. These rules are known as the administrative law. To further explain, administrative law are those rules and regulations that govern the processes of any official decision making; in this case, application for the link-up of Macquarie Radio Network and Fairfax Mediaââ¬â¢s radio business. As this article reports, the Australian Competition and Consumer Commission has granted the proposal of the merger. This d ecision making process falls under the category of the administrative law. Furthermore it is also stated that the ACCC granted licences for Macquarie Radio in Sydney for radio stations 2CH, 2UE and 2GB. The licensing also falls under the administrative law. Consumer Protection Law Consumer protection law concerns the provisions government provides in order to help protect the rights of consumers while dealing with their supplies of goods or services. By considering the effects of this link-up on the radio advertising prices, quality of service delivered such as news and other radio programmes and variety of radio stations available for customers, the national competition regulator protected the rights of consumers. The ACCC made sure that despite this link up, customers will continue to benefit from a variety of radio programmes to choose from. Property Law The article quotes that Sydneyââ¬â¢s 2UE, the 3AW of Melbourne, 4BC of Brisbane and 6PR of Perth will belong to Fairfax Radio and radio stations 2CH and 2GB will be owned by Macquarie Radio. Property law is all about acquiring private rights in goods and lands. In this case, both Radio companies own their respective radio stations and are therefore entitled under the property law. Trespassing of any private show will lead to legal consequences. The consideration of the contract is also a form of property law. As mentioned in the article, after the completion of the deal Macquarie Radio would own Fairfax Mediaââ¬â¢s radio assets and the latter would own 54.5 percent of Macquarie Radio. Contract Law There are various forms of contract law, some formal, some informal. In this article it is a commercial relationship. Therefore in order for the merger to occur, there must have been some paperwork and agreements to begin with. These agreements are referred to as contracts. The contract for the merger exists because there is a serious intention from both radio stations, an agreement b etween them and a consideration being the 54.5 percent ownership for Fairfax Media and the latterââ¬â¢s assets for Macquarie Radio. Furthermore it is also mentioned in the article that this contract is a new multi-million dollar one and the amount of money needed to be invested is quoted $200 million. Though, this amount is still subject to the approval of the shareholders. The contract law allows rights and duties that can be legally enforced. A breach of contract may lead to serious legal actions such as fine. 2) Demonstrate how the law functions in these various ways, by reference to specific examples within the chosen media report and the areas of law you identified in question 1. Ensures reasonable predictability in daily life. For this particular function, the law that best supports this statement is the contract law. One good example from the article could be the link-up. This link-up helped the Macquarie Radio and the Fairfax Media to plan their business ventures as one big company. Knowing that their application has been sanctioned and that they each own a certain amount of assets it is easier for them to get involved in future transactions. Also, as mentioned in the article, they both now own their share of radio shows and Macquarie Radio would also be licensed for Sydney stationsââ¬â¢ 2UE, 2CH and 2GB once the deal is sealed. This information can help them plan their future investments knowing now they own these shows. However the mergerââ¬â¢s worth is quite high and this is still subject to the approval of the shareholders and may comprise of an element of risk. On a more positive note though, this is another example as to how a contract can ensure predictability. The fact that the owne rs are aware of the amount of money needed to be invested, they can plan on a strategy to raise money on their own or publicly by selling shares. Encourages and discourages certain conduct. A good example of this function could be the proper investigation ACCC carried out before giving the go ahead. The consumer protection law encompasses a clause where consumers have the right to proper disclosure of information within a firm in order to be able to make informed choices depending on their needs and wants. The ACCC dutifully made sure that the radio stations would still face competition and that audiences would continue receiving good quality content. The advertising agencies, who are also the consumers of the radio station, will still get reasonable advertising prices. Therefore, by creating such a clause, the law is encouraging transparency of businesses and fair trade and discouraging or rather minimizing fraud and corruption. Grants rights and powers to individuals/ groups of people. Given Fairfax Media owns the 2UE, 3AW, 4BC and 6PR and Macquarie Radio owns 2GB and 2CH they have certain rights on these stations. These rights are the property rights. Having these property rights, the owners of these stations can exert certain powers which allow them to take decisions. For example, each of them are granted the rights and powers to remodel their studio or make any changes within their periphery. Any trespassing of a private property may and will lead to serious legal issues. Imposes obligations on individuals or organisations to meet their legal responsibility. The contract law best explains this function because as a person gets into an agreement, it is already implied that there are certain conditions that each party has to fulfil on their end. For example, the contract in this article is the link-up between the two radio networks. In exchange of the merger of their companies and working as one whole unit, each radio network shall gain their share of benefits. Both owners will have to meet their legal responsibilities, work in the utmost interest of the firm and in return both should gain their part. In case of breach of contract, that is, one owner not complying to the rules of the deal, there shall be a lawsuit. Allows for the enforcement of recognised rights and duties. As the ACCC sanctions the proposal of the merger, the rights of each party are legally enforced. To further explain, this means that both parties have now legal rights to the daily transactions of the unit as a whole. More importantly, Fairfax-Macquarie Radio Network will have the legal right to operate in the foreseeable future. Therefore, this law permits the society to distinguish between legal bodies and illegal ones. Provides remedies when an injustice has been done. In businesses, directors have certain duties to fulfil. In case these duties are breached, these directors may be sued according to the corporation law. There are certain legal rights created by the corporation law that may provide remedies in case of breach of responsibilities. In this article for example, though the ACCC has given the go ahead, the link-up is still hinged on the consent of the shareholders. This shows that the rights of the shareholders are respected. In case this was not the case, the shareholders themselves would have been able to take civil actions against the directors for failing to shoulder up their responsibilities. 3) By reference to the legal issues contained in the media report, explain why it was important for the relevant party/parties to know the law in the circumstances? How did, or could, the party/parties have applied the law to their advantage? In order to be able to gain maximum profit in the future, be it for an individual or for a fi rm, proper knowledge of the laws is very important. This is because ignorance of the law is no excuse of breaking it. Knowing the law makes oneââ¬â¢s rights and duties more transparent resulting into a stronger position. For example, in this article the transactions of the radio networks such as their profit are clearly revealed as well as the details about the link up. This is a good example depicting the consumer protection law and the duties of the directors which they correctly fulfilled. Consumers also may use this law in their advantage, by use of the information provided and make the best decision for their own benefit. In case of ignorance of this law companies would be able to fool people without their knowing of it. Another example of a good knowledge of the law is that of the paperwork of the link-up. Knowing the law correctly, the directors stayed in their boundary and waited dutifully for the administration departmentââ¬â¢s verdict. Having done everything withi n the periphery of the law and having earned licences, this business will now flourish better. Had they not known the law, they might have faced negative consequences in the future or might have unknowingly trespass the law which would result in their loss. Hence they knew how to use the law in their favour. 4) How do the media influence public perceptions about the law and its administration? How might public pressure impact legislators and judges in establishing the law? It is undeniable that media plays a crucial role in the lives of people. While media has been the medium to know about facts in many cases, there are many such cases as well where people misjudged matters on the basis of the information presented. Normally, it can be noted that the press will cover a story only at the beginning stages of the enquiry, that is, prior to anyone being found guilty. The details of the accused go viral almost instantly and biased reports are made. These types of sensationalized an d one-sided reports can signify that the suspect is portrayed very negatively and already accused for the crime he is not yet proven guilty for. Peopleââ¬â¢s perceptions may definitely get influenced and often compromises their ability to make proper judgments. A survey carried out in Canada revealed that people who passed out judgments based on the media articles supported more severe sentences than those who read the summary of the real facts from the courtââ¬â¢s sentencing hearing (Roberts and Doob 1990, 468). Another example of such media influences may be The Trayvon Martin case where the media made several mistakes concerning the accused Zimmerman (The Week April 3, 2012). As far as the impact of public pressure in the establishment of law is concerned, this issue is subject to debate. Under normal circumstances, law making people are those who belong to the parliament and at times the judges. However, under extreme cases, the public often proved to have raised the ir voice against matters they found baffling. Such an example could be the famous UK school massacre in Dunblane. The inhabitants, who were so appalled of such a horrible incident, could not understand how a man like Hamilton could have the licences to guns. They therefore set up a very successful campaign which led into a petition with approximately 75000 signatures. After such a strong campaign the Scottish government was forced to reconsider the gun laws in order to better protect the country (Wilkinson 2013). Reference list: Australian Competition and Consumer Commission. 2015. Welcome to the ACCC. https://www.accc.gov.au/ Roberts, Julian V and Anthony N. Doob. 1990. ââ¬Å"News Media Influences on Public Views of Sentencing.â⬠Law and Human Behaviour 14(5): 451-468. Doi: 10.1007/BF01044222. The Week (April 3, 2012) https://news.yahoo.com/trayvon-martin-case-4-things-media-got-wrong-130500344.html Wilkinson, Peter. 2013. ââ¬Å"Dunblane: How UK school m assacre led to tighter gun control.â⬠CNN, January 30. https://edition.cnn.com/2012/12/17/world/europe/dunblane-lessons/ 1 Ghanishta Gungaram 18030273
Wednesday, May 6, 2020
Hurricanes Devastating Natural Disasters - 999 Words
Hurricanes are one of natureââ¬â¢s deadliest natural disasters. They cause massive property damage to towns and cities in the warmer hemospheres all over the world. In 2004, for example, the United States of America was hit by Hurricane Katrina, one of the most devastating natural disasters to hit the USA. Hurricane Katrina destroyed huge parts of Louisiana, but also affected Mississippi, Alabama and even states farther up north like New Jersey and even Pennsylvania. Hurricanes are put into 5 categories. The categories rate the hurricanes from weakest to strongest. Most hurricanes form around the equator. The World Meteorologists Organization names hurricanes to better keep track of them. Hurricanes are an awesome but deadly force that should be respected. Hurricanes are very powerful. They can range vastly in size, power and destructive capability. Hurricanes come in five categories. Each category is stronger than the last and the higher the category the bigger the hurr icane is. Category 1 hurricanes have sustained winds that range from 75 to 95 miles per hour(Stewart) and can cause minor damage to man made structures. Category 2 hurricanes are a little bigger, with wind that ranges from 96 to 110 miles per hour(Stewart) and can damage homes but not destroy them.. Category 3 hurricanes have winds that range from 111 to 130 miles per hour(Stewart). Category 3 hurricanes can rip trees from the ground and destroy small houses and other small man made structures.Show MoreRelatedDisaster : The Causes And Effects Of Natural Disasters1012 Words à |à 5 PagesWhat are natural disasters? Natural disasters are defined as any disastrous event caused by nature or the natural movements of the earth, itself. How severe a disaster is is determined by how bad a loss the economy has suffered, how many lives were lost, and whether or not it will be possible to rebuild the city/town and population effected. If one of these natural disasters were to happen in a n area of the world that is not populated, for example, a wildfire on some island that nobody has ever livedRead MoreThe Disaster Of The Hurricane Katrina1344 Words à |à 6 PagesThe devastating Hurricane Katrina left Louisiana, and the rest of America, distraught. The mighty category 5 hurricane left thousands of Louisiana residents without food, water and shelter. The devastation of the storm led the levies of the flood-protecting dam to break leaving the city underwater during the catastrophe. This natural disaster will go down in American history as the worst of its kind. Although all the unfortunate natural events that made this tragedy possible, the supervision ofRead MorePaper1113 Words à |à 5 PagesMrs. Armstrong English 101-10 8 December 2015 Hurricanes Manifestations of Disaster Winds of disaster, waves of multitude, preparations galore, the wait is on to determine the outcome of a hurricane. Being one of the most devastating and feared natural disasters, hurricanes are a brutal and unpredictable force. Never knowing what could happen or what they will do, forewarning and preparation for hurricanes are highly recommended. A hurricane is a form of a tropical cyclone or severe tropicalRead MoreThe Toll Left by Hurracens Katrina and Hugo836 Words à |à 3 PagesOver the past few centuries, the natural disaster of hurricanes has had a huge impact on the land around us. It could cost millions, or even billions of dollars in repairing the damages done by hurricanes. These natural disasters can not only result in property damage but also many lives lost and injured victims. Hurricanes usually leave many without homes, forcing victims to find shelters or relocate to a different city or state for safety. A hurricane is a violent, tropical, cyclonic storm withRea d MoreNatural And Man Made Disasters1730 Words à |à 7 Pagesdifferences between two different natural and man-made disasters. The disasters that will be discussed are Hurricane Katrina and the Deepwater Horizon oil spill. Additionally, this paper will look into the specifics of what constitutes a natural and man-made disaster. Specifically, this paper will look into each disaster to include the events surrounding them; the risks; and the assessments. Furthermore, this paper will look at some of the details of each disaster and why there was so much devastationRead MoreU.s. Government s Impact On The United States877 Words à |à 4 PagesThe U.S. has suffered from many Natural Disasters from Hurricane Katrina to wildfires in California. When it comes too natural disasters Hurricanes are by far one of the most devastating. The results can be catastrophic, possibly leaving the death tolls in thousands and leaving millions homeless. Even though the U.S. has responded to and re covered from Hurricanes, Meteorologists are presently not able to predict them early enough, and the U.S. government is unprepared financially, and responsivelyRead MoreHurricane Sandy : Preparing For The Future Essay1122 Words à |à 5 Pages Hurricane Sandy: Preparing for the Future Junot Diaz once said ââ¬Å"Disasters donââ¬â¢t just happen. They are always made possible by a series of often-invisible societal choices that implicate more than just those being drowned or buried in rubbleâ⬠(Junot Diaz, 1). This quote introduces the idea of what is referred to as a social disaster. A social disaster can be a natural disaster such as earthquakes, tsunamis, or hurricanes etc. that are associated with some environmental, cultural, or politicalRead MoreHurricane Katrin Disasters And Disasters909 Words à |à 4 PagesHurricane Katrina Weather disasters come in all different forms, everything from volcanos to earthquakes and tsunamis and hurricanes. All of these are natural disasters and all have their own significant impacts. We have experienced several of these within the past 10 years. Many with great impacts, however as far as hurricanes go, Katrina was one of the five the most dangerous and devastating hurricanes of U.S. history. On August 28, 2005, Hurricane Katrina struck the Gulf Coast of the United StatesRead MoreHurricane Katrin A Devastating Storm1576 Words à |à 7 PagesHurricane Katrina was a devastating storm that ravaged New Orleans, but it was more than just a natural disaster. The general public and even some top officials are quick to dismiss this great storm as an inevitable force of mother nature as if it was just another hurricane of the season. In doing so, they subscribe to a mindset that is actually a disservice to those who suffered Hurricane Katrinaââ¬â¢s wrath. A myriad of publicatio ns like Come Hell or High Water, Overcoming Katrina, and There is NoRead MoreSocial Media Negatives780 Words à |à 4 Pagesrecent events, like politics and natural disasters, social media can widely benefit us to getting this news quickly and efficiently. A great example of how social media gives us our news quickly is with the recent devastating events of hurricane Harvey. When this devastating hurricane hit in Houston, Tx, news outlets used social media to help let people know what safety precautions to take and what the people could do to help those who were greatly affected by the hurricane. The down side of the easy
Tuesday, May 5, 2020
Biography of Zaha Hadid Samples for Students â⬠MyAssignmenthelp.com
Question: Discuss about the Biography of Dame Zaha Mohammad Hadid. Answer: Dame Zaha Mohammad Hadid was an Iraqi British architect, born on 31st of October in the year 1950. Inthe year 2004, Zaha Hadid became the first woman to recieve the Pritzker Architecture Prize. The architect has also won the Stirling Prize, which is the United Kingdoms most prestigious award in the field of architecture. For the services in architecture, Elizabeth II made Zaha Hadid the Dame (Zaha Hadid, 2018). The Guardian described the architect with Queen of the Curve title. Zaha Hadid was the only woman to receive the honor of Royal Gold Medal given by the Royal Institute of British Architects. The major projects that was undertaken by Zaha Hadid are Maxxi, Bridge Pavilion, Maggies Centre, Contemporary Arts Centre. The architect also constructed the aquatic centre, which was a part of the London Olympics in the year 2012. There were a number of projects that were under construction when the architect passed away. The most important and major project among these was the Al Wakrah Stadium that is present in Qatar. This stadium is also a venue for the 2022 Fifa World Cup. The architect passed away on the 31st of March, 2016 in Florida at the age of sixty five. References: Zaha-Hadid.Com. https://www.zaha-hadid.com
Saturday, April 18, 2020
PovertyDisappearing American Dream Essays (1075 words)
While you are hanging out with your friends in a luxurious club; or driving your polished car to work, the word ?poverty? has probably never crossed your mind. It is true that most of us do not realize how serious this issue has become, and more effort should be taken. According to the US Census Bureau, the official poverty rate in 2008 for US was 13.2 percent?a statistically significant increase since it was 12.5 percent in 2007. That counts 39.8 million people (19% of them are children under the age of 18) are living under poverty and that number was the highest in past fifty years. The reality hurts. As poverty has become more and more devastating, it makes people wonder what causes the rich to be richer and the poor to be poorer. Amount many theories proposed by so called ?economists?, I think the central idea is that we are neglecting the truth?there is not enough social equality for the poor, and a lacking of social mobility. Although we cannot change the fact that we were born differently and those who were born in rich families took a big advantage in their early life, what we want to pursuit later on in our lives determine what we will end up being. But it seems hopeless for the poor to seek for their American Dreams, which once means that you would success if you work harder. Because of social inequality, the poor has have less opportunity. Angela Locke, a writer for the feminist news journal off our backs, in her article ?Born Poor and Smart (2005)? describes that poor people are treated unequally such as their intelligence is scorned within the ranks of the poor. (Locke, 2008, 2) Locke?s mom is an assiduous, loyal and diligent worker, with years and years hard working in E-Z Bargain Center and assembly line, she finally got a position in the lab of Nestle factory?making coffee for her male coworkers! (Locke, 2008, 3) Was that because she was not smart enough? No, it was because she came from a poor family. At the same time, Herbert J. Gans, a professor of sociology at Columbia University, in his article "The War Against the Poor (1992)" also claims that poverty is not being treated properly. ?Conservatives, often mute about the responsibilities of the rich, stress the responsibilities of the poor,? Gans stated. (Gans, 2008, 26) Lack of education, basic healthcare, job supply, and so forth, poor people rarely have access to experts or to clinical treatment, so how would we expect them to take their responsibilities if we cannot treat them equally? An article named ?Middle of the Class? publicized on in The Economist?a weekly magazine published in England by The Economist Group, emphasizes that ?equality of opportunity is under threat.? (The Economist, 2008, 1) Statistic show that with a 200 percent income increase in the past quarter-century, the rich have been doing dramatically better than the less well off. The middle class had an 18 percent increase, but the bottom fifth only received 4.4 percent of total national income. (The Economist, 2008, 3) It use to be possible if you start at the bottom of a big firm and work your way up, but now facing more and more college graduates, the opportunities for poor to get a decent degree is even less, let alone a well paid job. Increasing tuition and stiffer competition has driven the poor into an impasse. Social inequalities create an invisible barrier for the poor to escape poverty. What makes matter worse is that it also generates a lack of social mobility, which makes it even harder for poor people to breaking away. Our author Gans suggests that there is a drastic scarcity of work for the poor. (Gans, 2008, 27) Ironically, many Americans, including too many economists, have long believed that jobs supplied are always more than jobs demanded, and it is ridiculous to be truly jobless. (Gans, 2008, 27) Sadly the truth is just the opposite. There were no longer decent jobs that are open to the poor, especially to blacks. With the poor?s dropping out of the labor force, their only chance to escape poverty has also vanished. Similarly, The Economist
Saturday, March 14, 2020
Chemistry of the stratosphere Essay Example
Chemistry of the stratosphere Essay Example Chemistry of the stratosphere Essay Chemistry of the stratosphere Essay Measurements can be taken using the helium balloons. A 10 miles long cord is used to attach the balloon and the measuring device which can be reeled in and out to take measurements at different altitudes. Spectroscopic measurements can also be taken from the ground stations by looking upwards through the vertical column of the air. Laboratory measurements We need to know which species absorb solar radiation, the wavelength of the radiation absorbed and the strength of the radiation. It is also important to know which products are formed as a result of which reaction and the rate of the reaction, using the flash photolysis technique. In this, an intense laser flash starts the reaction and the composition is measured spectroscopically using a carefully times second flash. Meteorology It is essential to know about the conditions in the stratosphere and the how the gases mix up. Distances are vast in the stratosphere and the mixing between the vertical layers is slow, whereas air circulating around latitude lines, help gasses to mix within a layer. The information collected by the sources mentioned above is used to create models and therefore make predictions. Evidence that led scientists to link ozone depletion with the use of CFCs In 1972, a method of detecting the CFCs in the troposphere was developed. A gas chromatograph was used to split the air into different components. This was coupled to an electron-capture detector which was sensitive to the halogen compounds. Small concentrations of CCl3F in rural areas were detected, which was able to diffuse intact to Antarctica. It was thought that a CFC molecule would get involved in the following reaction. The Cl radicals could destroy the ozone in the reaction shown in the diagram. This information lead to the conclusion that Cl radicals had a very long lifetime and one radical could destroy 100 000 molecules of ozone. Extensive global monitoring of CFCs was carried out and this amount was compared with the amounts released in troposphere and it was concluded that most of the molecules released were still there. The chemicals reactions by which ozone is depleted in the stratosphere and why ozone depletion is most severe over Antarctica in the southern spring. Ozone depletion occurs by the release of CFCs and some other ozone-depleting substances. A single chlorine atom can break about 1million ozone molecules. When CFCs reach the stratosphere, the strong ultraviolet radiation from the sun breaks them apart, releasing chlorine which react with ozone. Cl + O3 ClO + O2 ClO formed is another radical which reacts with oxygen atoms. ClO + O2 Cl + O2 This could start the chemical cycles of ozone destruction depleting the ozone layer. Cl atoms are regenerated and can go on to react with more O3 Following is another way that the ozone could be removed. O + O3 O2 + O2 Hydroxyl radicals can also play a part in the depletion of ozone. HO + O3 HO2 + O2 The HO2 could then react with oxygen atoms. HO2 + O HO + O2 The ozone depletion is most severe over Antarctica in the southern spring which results from the weather conditions in winter because the sun disappears for a period of six months. Air cools down making the temperature fall and clouds form in the stratosphere. These clouds contain particles of nitric acid triydrate (HNO33H2O) below 195K which are frozen around the sulphuric acid nuclei. A decrease in temperature leads to the condensation of water vapour as ice on the surface of these particles. The solid particles provide a surface for the chemical reactions to take place. Chlorine reservoirs collect on these surfaces and react. HCl + ClONO2 cloud Cl2 + HNO3 surface These chlorine atoms are released into the stratosphere. Te return of sunlight after six months splits the chlorine molecules into chlorine atoms which leads to dramatic fall in the ozone concentration. Why the CFCs have been used so widely and the advantages and disadvantages of their replacements Chlorofluorocarbons are found to combine lox toxicity, high chemical stability and non-flammability with good performance. CFCs and the HCFCs were use as refrigerants because they have appropriate boiling point which is low enough to evaporate efficiently but high enough to liquefy by compression. They also have a freezing point low enough to prevent the liquid from solidifying. CFCs were used for several applications, which include air conditioners, water chillers, aerosols, domestic fridges and freezers, dry cleaning and biomedical freezers. After discovering about the ozone depletion related to the use of CFCs, various other substances were to be found which would be environmentally friendly. HFCs seemed like the solution. The hydro fluorocarbons (HFCs) compounds contain only carbon, hydrogen and fluorine. They are chosen because they contain fluorine as their only halogen. Free fluorine atoms can only be liberated from a fluorine-containing substance by putting in a considerable amount of energy. This required energy input is far more than is available in the solar radiation I the stratosphere. If the fluorine atom was to be produced, it would be highly reactive and would abstract a hydrogen atom from a molecule like water to form an inert hydrogen fluoride. No free fluorine atoms in the stratosphere would lead to no ozone destruction. Also, HFCs are usually destroyed in the lower atmosphere by hydroxyl radicals so only a small proportion can reach the stratosphere. The disadvantage of using HFCs is that the equipment was designed to optimise the performance of CFCs and HCFCs and the use of HFCs would mean the redesigning of all the equipment. In future, cooling technologies not involving HFCs maybe introduced, especially where they have technical advantages and where the potential hazards can be easily controlled. Bibliography 1) How do we know that CFCs destroy the ozone layer? By Mike Pilling. Chemistry Review, March 1993. Philip Allan Publishers Ltd. 2) The rise and fall of CFCs by Dr Richard Dick Powel. Chemistry Review, September 1996. Philip Allan Publishers Ltd:Ã epa.gov
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