Sulfur Dioxide and Oxides of Nitrogen

Sulfur Dioxide and Oxides of Nitrogen Alan Chan Since the Industrial revolution, there were great increases in emissions of sulfur dioxide and particulates, deteriorating air qualities more dominantly in industrial cities but also suburban areas and environments close by. Two of the very evident and dominant gases which cause much damage to our Earth include both sulfur dioxides and oxides of nitrogen which when reacted with water turn acidic through acid rain such that SO2(g) + H2O(l) > H2SO3(aq) and 2NO2(g) + H2O(l) > HNO2(aq) + HNO3(aq). As shown, the reaction between the sulfur dioxides and oxides of nitrogen form acidic solutions when reacted with water as they release hydronium ions which indicate their acidic natures. There are much of both (sulfur dioxide and oxides of nitrogen) produced naturally and also industrially. Natural sources of sulfur dioxide contribute to of the total sulfur dioxide released to the atmosphere where it reacts with water and causes acid raid comes from activities of geothermal hot springs and volcanoes and the combustion of organic matter, eg bushfires and decomposition of organic matter. Natural sources of the oxides of nitrogen, such as nitric oxide is lightning. These oxides of N2 are generated by lightning such that atmospheric oxygen and nitrogen gases combine to form nitric oxide: O2(g) + N2(g) > 2NO(g) Then the nitric oxide slowly reacts with oxygen to form nitrogen dioxide: 2NO(g) + O2(g) > 2NO2(g) The above is the major natural source of nitrogen dioxide. And finally, nitrous oxide is formed naturally by the action of certain bacteria on nitrogenous material in soils. Main industrial origins of sulfur dioxide come from the combustion of fossil fuels (especially in power plants and motor vehicles). Smelting of sulphide ores during conversions of minerals to metals (such as lead, copper and zinc); incineration of garbage; petroleum refineries and industries using sulfur dioxide for production of sulfuric acid, production of paper, food processing and sewage treatment all contribute to the oxide of sulfur in the air. The main industrial origins of oxides of nitrogen include the large amounts of nitric oxide and nitrogen dioxide is combustion, both in stationary sources (power stations) and moving ones (motor vehicles). At high temperatures in combustion chambers, oxygen and nitrogen from air combine to form nitric oxide, and then nitric oxide is slowly converted to nitrogen dioxide. Releases of nitrous oxides to the atmosphere include the increased uses of nitrogenous fertiliser which provides more raw material for the bacteria. In terms of concern for their release into the environment, there are many: Effects of sulfur dioxide and nitrogen oxides on human health ie; sulfur dioxide irritates the respiratory system and causes breathing difficulties at concentrations as low as 1ppm. Effects of sulfur dioxide are magnified if particulates are present also. Nitrogen dioxide irritates the respiratory tract and causes breathing discomfort at concentration levels of about 3-5ppm and greater that causes tissue damage. Effects of sulfur dioxide and nitrogen oxides on the environment -> formation of acid rain H2O(l) + SO2 > H2SO3(g) and 2NO2(g) + H2O(l) > HNO2(aq) + HNO3(aq) which contributes to the increasing acidity of lakes (aquatic animals hence), damage to forests (such as pine forests in parts of Europe and North America), erosion of the marble and limestone of building surfaces and decorations and severe damage to vegetation especially around mine and smelter sites. Even though this has happened very slowly over a long period of time, it is greatly concerning as these releases of gases will only increase as industries and mining in particular grows for the future. In the long term, these effects will become even more evident and greater and may be very difficult to restore or even slow down. As mentioned before, the main contributor to high sulfur dioxide levels comes from the combustion of fossil fuels in power plants and motor vehicles. Coal and petroleum products contain sulfur, which combines with oxygen in air to form sulfur dioxide. S(s) + O2(g) > SO2(g) Smelting of metal sulfides, eg copper sulphide, also produces sulfur dioxide. CuS(s) + O2(g) > SO2(g) + Cu(s) Nitrogen undergoes combustion to form nitrogen monoxide and dinitrogen monoxide. Fossil fuels and biomass contain nitrogen (in proteins), so they also burn to produce these oxides. N2(g) + O2(g) > 2NO(g) 2N2(g) + O2(g) > 2N2O(g) N2(g) + 2O2(g) > 2NO2(g) Nitrogen monoxide burns to produce nitrogen dioxide. 2NO(g) + O2(g) > 2NO2(g) Although we may hear a lot about the effects of sulfur dioxides and oxides of nitrogen when reacted with water (acid rain), it is difficult to quantitatively state that oxides of sulfur and nitrogen have been increasing in the atmosphere because these oxides occur in relatively low concentrations, such as 0.01ppm, and the instruments used to measure these very low concentrations such as for SO2 have only been commercially available since the 1970s, so there is no reliable date for these gases before this time. However, analysis of gases found in Antarctic ice core samples by the CSIRO and the Australian Antarctic Division showed that levels of N2O in the atmosphere has increased by about 10%. Also, the increased burning of fossil fuels after the Industrial Revolution lead to a rise in oxides of sulfur, and evidence for this is the air quality of major industrial cities that deteriorated greatly. Increase in acid rain, which is mainly caused by acidic oxides of nitrogen and sulfur dissolved in water, eg SO2(g) + H2O(l) > H2SO3(aq) which is acidic and 2NO2(g) + H2O(l) > HNO2(aq) + HNO3(aq), of which both are acidic. This lead to the increasing damage to buildings, forests and aquatic organisms. Also, it was found that higher atmospheric concentrations of sulfur dioxide and nitrogen oxides in industrial areas than in non-industrial areas. Although we do not have accurate measures of atmospheric oxides of sulfur and nitrogen taken over a long period of time, there is enough indirect evidence to conclude that significant increases in atmospheric concentrations of oxides of sulfur and nitrogen have indeed taken place, especially since industrial revolution With the aforementioned much dangerous particulates, sulfur dioxides and oxides of nitrogen especially when reacted with water forming acid rain, it is very important to use indicators to determine if levels of pH in the environment are at damaging levels for organisms and growth of nature. A few of many every day uses of indicators include testing the pH (acidity/basicity) of water in aquariums and swimming pools, chemical wastes and soils. The testing of pH in the water of aquariums is extremely important as marine life are sensitive to changes in their water. If the water becomes too acidic or alkaline/basic, organisms including fish and plants may not be able to survive. A few drops of indicator can be placed in a sample of the water, or a pH paper already soaked in indicator can be used to measure the pH of the water. As swimming pools are widely used by the public, the pH of the water also needs to be monitored regularly as it needs to be kept at almost neutral to avoid skin and eye irritations. Adding chlorine (hypochlorite ion) is one way to control acidity and stop algae from growing. The testing of pH will be similar to that of the testing of pH of water in aquarium. Other than the public interactive environments, there are also chemical wastes which are produced industrially. The waste solutions from industries are tested before they are pumped into rivers or seas as they tend to be highly acidic. The pH of the wastes must be neutralised or they can be very harmful to the environment. The pH of chemical wastes is also measured by indicators, and substances are added to neutralise it. Many plants only tolerate a narrow pH range, so the soil has to be tested regularly to ensure its survival. A way of testing the pH is to place a neutral white powder (such as barium sulfate or calcium sulfate) on top of moist soil, and then place a few drops of universal indicator on it. The powder then absorbs the moisture from the soil allowing the colour of the indicator to be clearly seen. Other than sulfur dioxides and oxides of nitrogen when reacted with water which produces acid rain eg SO2(g) + H2O(l) > H2SO3(aq) and 2NO2(g) + H2O(l) > HNO2(aq) + HNO3(aq) and hence affecting society and environment, there are many other naturally occurring acids and bases. Some commonly known naturally occurring acids include hydrochloric acid, acetic acid, citric acid and ascorbic acid. Hydrochloric acid HCl is produced by the glands in the lining of our stomachs to form an acidic environment for the breaking of complex food molecules by the enzymes. Acetic acid CH3-COOH such that vinegar is about 4% solution of acetic acid and helps to preserve food. It is produced naturally by the bacterial action on alcohol in air. Citric acid C6H8O7 is widespread in plant and animal tissue, especially in citrus fruit. It is also formed in our bodies during cellular respiration. Ascorbic acid C6H8O6 also known as vitamin C is present in fresh fruits and vegetables. It is involved in many metabolic pathways and has an important role in healing, blood cell formation and tissue growth. There are also many naturally occurring bases which may include ammonia, metallic oxides and carbonates. Ammonia NH3 is present in the stale urine of humans and other animals. It is also formed through the anaerobic decay of organic matter. Metallic Oxides such as iron(III) oxide, copper oxide and titanium (IV) oxides are insoluble and are solid bases found in minerals. Carbonates such as calcium carbonate CaCO3 is found naturally as limestones. As shown, there are many naturally occurring acids and this has been used to our advantage in homes such as using them as food additives. Acids are used as food additives to improve the taste and/or to preserve them. This is because many bacteria cannot survive in acidic conditions and if the acid used is weak enough and not harmful for human consumption, this will allow food to last over a period of time. Common acids for this use include acetic acid, citric acid and phosphoric acid. Acetic acid(vinegar), phosphoric acid and citric acid is used to improve taste. Propanoic acid is used as a preservative in bread. Another advantage of having many acids is the use of them to make esters, which are â€Å"compounds formed when alkanoic acids react with alkanols, or more generally, when carboxylic acids combine with alcohols.† â€Å"Esters have pleasant, fruity odours and occur widely in nature as perfumes and flavouring agents†, hence its use as food additives, artificial fruit essences and in the manufacture of perfumes and cosmetics. As flavours, it is a combination of crude taste (sweet, salt, bitter) and odour, and it is these odours which contribute to flavours. It is easier to mass-produce these synthetic esters for use as flavours and perfumes in processed foods and cosmetics than to use naturally occurring ones and they represent little health hazards as â€Å"they contain only substances that occur in natural flavours†. Overall, our environment is acidic as shown through the need to test the pH in our waters and soils, which was caused by sulfur dioxide, oxides of nitrogen and particulates released into the atmosphere where it reacts with water releasing hydronium ions through acid rain. These acids are very damaging to our society and environment in the long term as discussed through their lowering pH levels in waters, soils and corrosion of buildings. However, advantages of having acids were also discussed; being used to preserve foods, improve their tastes and using them as esters. The negative effects of acids may seem to outweigh the positive effects on a much wider scale but there are nonetheless both many advantages alongside the disadvantages which benefit our society and are essential to our everyday lives. Bibliography Excel HSC Chemistry – Jim Stamell – Reprinted 2012; P69-70 Conquering Chemistry HSC Course Fourth Edition – Roland Smith; P121-126,131-133. Module 3: The Acidic Environment Theory Notes HSC Chemistry – Johnson for Irwin’s Atoms 2003

Panera Bread Essay

In this paper I will be discussing the company Panera Bread, its history, and how they decided on the business strategy that the company uses. I will also give a description of Panera’s strategic vision and how its stakeholders enable the success of Panera. Panera was built by Ron Shaich and originally started out in 1980 with a little store that used to be called the Cookie Jar. After three decades, a merger, and an acquisition later, Shaich’s empire turned into what we now know and love as Panera Bread. (Kowitt, 2012). Shaich started this bread empire when he was attending Clark University and was kicked out of a convenience store that didn’t cater to college students. So Shaich, who was the treasurer of the student body, decided that the college should make their own store, and that is exactly what they did. After running this store for the college, Shaich loved it so much that he decided to open his own store called the Cookie Jar, and in an effort to expand his offerings he became a licensee of the French bakery company, Au Bon Pain, whom later on merged with his company. Kowitt, 2012). Later Shaich stated that â€Å"[he] was worried because the French baked goods we sold at our half-a-dozen stores were becoming pedestrianized. We decided to use the croissant and bread as a platform to sell soups, salads, and sandwiches† (Kowitt, 2012). This is where they started becoming the store we are familiar with, however they had one more change to go through before they evolved into their current format. In 1993 Shaich purchased a small lunchtime soup, salad, and sandwich chain called St. Louis Bread Co. Shaich soon realized that this is where the gem of his business was located, so he changed the name to Panera, changed the environment to encourage people to gather, and sold off the other portions of his company such as Au Bon Pain. (Kowitt, 2012). This was the turning point for the company where Shaich decided to make the full business strategy for Panera to be that of the bakery cafe set up. With a vision of providing good quality breads and foods, with excellent customer service, this is key for while other companies have cut back due to the economy. Panera has continued their game plan to ensure the greatest experience for their customers. If you walk into other companies restaurants you will see longer lines, waits, and dirty tables due to those companies cutting back, whereas Panera continues to invest in labor in their cafes and the quality of their workers, as well as in the quality of their food. (â€Å"How panera bread,† 2010). This is their long term strategy and what I believe is the key to their success and the most important part of their strategy. They put emphasis on the quality of their food and the dining experience; this has really won over the customers that want a fast, clean, and healthy dining experience. This business plan of taking care of the customer first is due to the fact that the stockholders, and Shaich, who is the largest stockholder, allow Panera to remember that they started the company to provide quality service to customers, not to make money. Realizing that the stock price is a byproduct of them ensuring the customers are happy, and not the whole point of the company. A lot of companies think only of profits and hitting the bottom line, whereas Panera views their role as delivering a valued service to their customers. (Shaich, 2011). Shaich states that â€Å"We have to spend less time figuring out how to extract economic value from our stakeholders and more time creating what is valuable to them. Doing so is what ultimately creates long-term value† (Shaich, 2011). Arguing the fact that if you make sure the service you are providing is great then the customers will come, and your stock value will rise. Just like the old adage â€Å"if you build it they will come† this is the same thing, if you build a clean friendly restaurant with quality food, then the customers will come and spend money, and this is exactly what Panera has done and why they are so successful. My recommendation to Panera is to continue doing what they are doing, ensuring that the food and service quality at their restaurants stays at the high level that they already are. Never forgetting that this is what brings them long term profits, and to always keep that goal in view, instead of stripping down their services to create vast short term profits, but hurting customer loyalty and future sells. In conclusion we can see that Panera was able to start from a small little cookie store and transform into the huge restaurant chain it is today by focusing on taking care of their customers and not just looking at the bottom line of a balance sheet.

Good Concept Essay Topics Explained

Good Concept Essay Topics Explained What to Expect From Good Concept Essay Topics? In an academic setting, but the paper ought to be formatted and organized based on the corresponding standards without the usage of informal languages like slang or jargon. Try to remember that if you pick a fantastic title for your work, it gets really easy that you proceed with it and present a great paper generally speaking. It actually is crucial to realize that academic papers are very diverse than other varieties of writing. Well, grading papers can be very dull. How dates differ in type and the various types. Another good idea is to receive some completely free essay examples of different sorts and on various subjects to find a general idea of the way in which a prosperous debatable paper looks. Make certain you give clear explanations of the things on your list also. There are lots of web based functions that are advertised in addition to in the event you are fascinated you need to inspect the details where to find suitable jobs for you. Social media is essential once you've got an Etsy shop. You must read enough small business ideas from successful businessmen. Television is developing a new variant of culture The senior classes ought to be profiled Education for boys and girls ought to be separate Many individuals think the perfect way to travel is by car Activity is the sole method to knowledge The significance of education is underestimated now. When you receive a paper to write about it, you will need to understand that it doesn 't always just must be about a nation or a government. Why it isn't so bad to be homeless. F. Bacon The main goal of the capital isn't to get as much money as possible, yet to guarantee that money produces a better life. The Pain of Good Concept Essay Topics On-line work provedn't existent such enormous amounts two or three years back. Writing is an enjoyable way to pass the time for the two adults and kids alike. Life, Death and Good Concept Essay Topics Folks work to assist you a fantastic considerable selection related to people such while institutions as well as showing off organizations. The help here comes in various categories. Plenty of students put on a uniform. It is also feasible to come across fantastic issues to describe in literature. You ought to think about the significance of your favourite topic. Usually, it's crucial that you choose a topic from a collection of societal networking promoting research paper difficulties. Therefore, it's possible to eas ily find an appropriate topic. At any time you catch yourself feeling captivated by somebody's essay or article, take a close look at it. Remember you may make funny argumentative essays if you do a few things. Select a distinctive topic that others may not think of, and whatever you select, make certain you know a lot about it! For example, let's say you select the very first topic from our list. The Number One Question You Must Ask for Good Concept Essay Topics Permit the professional academic writers help to your informative paper! You are a genuine expert in regards to persuasive essay topics. The essay portion of the GED will request that you write a concise article on a pre-selected topic. Writing the college application essay is a difficult gig. Learn how funny argumentative essay topics can receive the interest of your tutor. The most suitable essay they help you get a rough feel of the actual essays. Also, prevent the obvious if you need your essay to be readable. A definition essay is among the simplest sorts of writing assignments that you may be given. Strategies for writing book reports on books you haven't even read. A thesis has to be arguable like in an argumentative or persuasive essay to create the readers wish to debate. There are a lot of fun essay topics that you may write on. Luckily, you have our top-class group of writers who can assist students and teach them how to opt for the most suitable essay direction. You have the best experience or achievement in your life before going to college. Describe the college you would like to visit. The student needs to be in a place to recognize the matter and the best way to resolve such problems systematically. Attempt to consider what age is very good for students to date with one another.

Coming Back to Cultural Imperialism - 623 Words

Coming back to Cultural Imperialism. We would like to start with the most rudimentary questions. What is culture. Why do we need to talk about it. What does Imperialism have to do with culture. And what is Cultural Imperialism. When Steger talks about the cultural dimension of globalization, he uses the words â€Å"symbolic construction, articulation, and dissemination of meaning† (90). Culture can define an individual, a group, a society, a nation or even the globe. Humans are social beings and since pre-historic times humans have been inquisitive and have embarked upon journeys to find new civilization. Today we are looking for life on other planets. When a person interacts with another, the first judgment he makes is about his nature. Similarly when we find ourselves in a new atmosphere, a new culture, the first few things we pick up are the culture not the economic status or the political scenario. It could be as simple as a greeting in the native language, or knowledge ab out the local cuisine, clothes or traditions. We all know that Vasco Da Gama brought along spices from his visit to India. What intrigues us so much, must be of huge importance. Culture exists in the form of ideas, language, identity, images and everything the human mind can perceive. Cultural is the inherent reactions, the way we behave socially, what we believe in and what makes us stand apart or defines us as a group. An interesting term at the heart of our discussion is ‘cultural products’. According toShow MoreRelatedBrionna Johnson. Mr. T.Kemiksizgil, Period 4. Mrs. K. Prinzo,1310 Words   |  6 Pages Period 4 Mrs. K. Prinzo, Period 6 03 March 2017 European Imperialism Good for Colonized Countries? Imagine you re in the 1700s and live in South Africa or another colonized country. You’ve gotten used to the new lifestyle, but then the Europeans come in and force imperialism onto you and your country. 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