Hydrogen Peroxide Essay Example for Free

Hydrogen Peroxide Essay The same reaction is catalysed by the  enzyme  catalase, found in the  liver, whose main function in the body is the removal of toxic byproducts ofmetabolism  and the reduction of  oxidative stress. The decomposition occurs more rapidly in  alkali, so  acid  is often added as a stabilizer. The liberation of oxygen and energy in the decomposition has dangerous side-effects. Spilling high concentrations of hydrogen peroxide on a flammable substance can cause an immediate fire, which is further fueled by the oxygen released by the decomposing hydrogen peroxide. High test peroxide, or HTP (also called high-strength peroxide) must be stored in a suitable, vented container to prevent the buildup of oxygen gas, which would otherwise lead to the eventual rupture of the container. In the presence of certain catalysts, such as  Fe2+  or  Ti3+, the decomposition may take a different path, with  free radicals  such as HO · (hydroxyl) and HOO · (hydroperoxyl) being formed. A combination of  H2O2  and  Fe2+  is known as  Fentons reagent. A common concentration for hydrogen peroxide is  20-volume, which means that, when 1 volume of hydrogen eroxide is decomposed, it produces 20 volumes of oxygen. A  20-volumeconcentration of hydrogen peroxide is equivalent to 1. 667  mol/dm3  (Molar solution) or about 6%. Redox reactions In acidic solutions,  H2O2  is one of the most powerful oxidizers known—stronger than  chlorine,  chlorine dioxide, and  potassium permanganate. Also, through catalysis,  H2O2  can be converted intohydroxyl radicals  (†¢OH), which are highly reactive. Oxidant/Reduced product| Oxidation  potential, V| Fluorine/Hydrogen fluoride| 3. 0| Ozone/Oxygen| 2. 1| Hydrogen peroxide/Water| 1. 8| Potassium permanganate/Manganese dioxide. Chlorine dioxide/HClO| 1. 5| Chlorine/Chloride| 1. 4| In aqueous solutions, hydrogen peroxide can oxidize or reduce a variety of inorganic ions. When it acts as a reducing agent,  oxygen  gas is also produced. In  acidic  solutions  Fe2+  is oxidized to  Fe3+  (hydrogen peroxide acting as an oxidizing agent), 2  Fe2+(aq) +  H2O2  + 2  H+(aq) ; 2  Fe3+(aq) + 2H2O(l) and  sulfite  (SO2? 3) is oxidized to  sulfate  (SO2? 4). However,  potassium permanganate  is reduced to  Mn2+  by acidic  H2O2. Under  alkaline  conditions, however, some of these reactions reverse; for example,  Mn2+  is oxidized to  Mn4+  (as  MnO2). Other examples of hydrogen peroxides action as a reducing agent are reaction with  sodium hypochlorite  or  potassium permanganate, which is a convenient method for preparing  oxygen  in the laboratory. NaOCl +  H2O2  Ã‚  O2  + NaCl +  H2O 2  KMnO4  + 3  H2O2   2  MnO2  + 2 KOH + 2  H2O  + 3  O2 Hydrogen peroxide is frequently used as an  oxidizing agent  in organic chemistry. One application is for the oxidation of  thioethers  to  sulfoxides. For example,  methyl phenyl sulfidecan be readily oxidized in high yield to  methyl phenyl sulfoxide: Ph? S? CH3  +  H2O2   Ph? S(O)? CH3  +  H2O Alkaline hydrogen peroxide is used for  epoxidation  of electron-deficient alkenes such as  acrylic acids, and also for oxidation of  alkylboranes  to  alcohols, the second step of  hydroboration-oxidation. Formation of peroxide compounds Hydrogen peroxide is a weak acid, and it can form  hydroperoxide  or  peroxide  salts  or derivatives of many metals. For example, on addition to an aqueous solution of  chromic acid  (CrO3) or acidic solutions of dichromate salts, it will form an unstable blue peroxide CrO(O2)2. In aqueous solution it rapidly decomposes to form oxygen gas and chromium salts. It can also produce peroxoanions by reaction with  anions; for example, reaction with  borax  leads to  sodium perborate, a bleach used in laundry detergents: Na2B4O7  + 4  H2O2  + 2 NaOH 2  Na2B2O4(OH)4  +  H2O H2O2  converts  carboxylic acids  (RCOOH) into peroxy acids (RCOOOH), which are themselves used as oxidizing agents. Hydrogen peroxide reacts with  acetone  to form  acetone peroxide, and it interacts with  ozone  to form  hydrogen trioxide, also known as  trioxidane. Reaction with  urea  produces  carbamide peroxide, used for whitening teeth. An acid-base adduct with  triphenylphosphine oxide  is a useful carrier for  H2O2  in some reactions. Alkalinity Hydrogen peroxide can still form adducts with very strong acids. The  superacid  HF/SbF5  forms unstable compounds containing the  [H3O2]+  ion. Domestic uses * Diluted  H2O2  (between 3% and 8%) is used to bleach human  hair  when mixed with  ammonium hydroxide, hence the phrase peroxide blonde. * It is absorbed by  skin  upon contact and creates a local skin  capillary  embolism  that appears as a temporary whitening of the skin. * It is used to whiten  bones  that are to be put on display. 3%  H2O2  is effective at treating fresh (red) blood-stains in clothing and on other items. It must be applied to clothing before blood stains can be accidentally set with heated water. Cold water and soap are then used to remove the peroxide treated  blood. Some horticulturalists and users of  hydroponics  advocate the use of weak hydrogen peroxide solution in watering solutions. Its spontaneous decomposition releases oxygen that enhances a plants root development and helps to treat  root rot  (cellular root death due to lack of oxygen) and a variety of other pests. Laboratory tests conducted by fish culturists in recent years have demonstrated that common household hydrogen peroxide can be used safely to provide oxygen for small fish. Hydrogen peroxide releases oxygen by decomposition when it is exposed to  catalysts  such as  manganese dioxide. * Hydrogen peroxide is a strong oxidizer effective in controlling sulfide and organic-related odors in wastewater collection and treatment systems. It is typically applied to a wastewater system where there is a retention time of 30 minutes to 5 hours before hydrogen sulfide is released.

Willy Russells Educating Rita Essay -- Willy Russell Educating Rita E

Willy Russells "Educating Rita" Educating Rita is a play about a working class girl who is tired of her lifestyle and asks a university tutor to educate her in an attempt to change her ways her life. Her tutor, Frank, shows her the cultures and values of the middle class world as well as teaching her about literature even though he too is tired of his lifestyle. Rita forces herself to change and realises the damage she causes to herself, acting as someone she isn't. Willy Russel writes about the clash of cultures from each of the English classes. In the beginning of the play when Rita and Frank first meet, they hardly understand each other: 'Frank stares at Rita who stands by the desk Frank: You are? Rita: What am I? Frank: Pardon? Rita: What? Frank: (looking for admission papers) Now you are? Rita: I'm a what?' The way of speaking in each class is so alien to the other and both Rita and Frank are totally bemused. Willy Russell uses this to show how much each class is separated with the other and how little to do they have with each other, each representative of each class in the play is depicted as having made stereotypes of the other: 'Rita: Can I smoke? Frank: Tobacco? Rita: Yeh. Was that a joke?' And: 'Rita: You wouldn't watch ITV would y'? Its all BBC with you, isn't it? Frank: Well I must confess Rita: It's all right, I know. Soon as I walked I here I said to meself, 'Y' can tell he's a Flora man. Frank: A what? Rita: A Flora man. Frank: Flora? Flowers?' In these two passages in scene one, it is possible to see the stereotypes that both Rita and Frank have of each other. Frank thinks that Rita might want to smoke cannabis, and Rita initially thi... ...hat she hadn't said it. But she had. And that's why I came back', Rita feels that her family is acting in pointless ways, pretending to themselves, e.g. like her mother, and feels she cannot bear to keep living a lie and wants to be able live how she wants to live, but in the end realises her education may not have been as amazing for her as she thought, in the last scene she tells of her flatmate and how she resented her lifestyle, in the end trying to kill herself. Rita realised she didn't want just to be able to regurgitate quotes and empty phrases, but to be herself, to enjoy whatever aspects of each social class she wants. In conclusion, the message that Willy Russell is trying to convey is that the boundaries of social class can be broken, and the key to success is to be yourself and embrace individuality rather to conform to the sheep of society.

Agriculture of CA and the Pacific Northwest

Since the dawn of civilization, man has always been searching for techniques to have a system of food channeling. Agriculture provided the requisite respite from hunting and gave mankind the necessary support. The United States of America, had agriculture as an integral part of the system and certain states have more affinity towards farming than others.Agriculture in California and Pacific Northwest has had its share ups and downs and both the regions have seen newer developments in agriculture due to newer laws and advances.â€Å"Agriculture of CA and the Pacific Northwest†One of the most intriguing occupation, that has not only been age old but also the most satisfying, has been ‘agriculture’.   California’s agriculture has a very unique history to it. The amount of changes that have taken place over a course of 200 years is enormous, and the agricultural industry has gone through a good and bad tenure during this phase.The changes have been intricate and precise due to a no. of factors.   The alterations in the industry has taken place in the choice of mix of crops; The kind of technology that has been altered from horse driven ploughs to high tech tractors embedded with powerful global positioning satellite guides.;The directional sources of water has been changed along with changes in ownership arrangement.   The face of the industry has completely been changed due to the growing demands of the urban population.But there are some factors of the Californian agriculture that remain the same. These core values have been with agriculture field from the start and have never been part of any change in the system.On a primary level, majority of the farming done in California has always been market eccentric and had never revolved around sustenance of famer’s family which was the basic concept of farming in the pre years of the country.The Farming community of California has always been adaptive and the entrepreneur mentali ty has always been an integral part of them.   Californian agriculture has always catered to newer markets demands and has always been part of a unique economic agricultural philosophy. Agriculture in CA has provided opportunities of fulfilling local and international market needs.From supplying wheat to Europe to vegetable in Asia, California’s agriculture has been a pioneer for varied markets.   Wine production was also fulfilled by California’s agriculture.Another factor that has been instilled in agriculture in CA is its resource dependency which has been laid out from the olden ages.   The agriculture carried out in California has always been ridden with antagonistic searching of newer lands and water resources.   Lands and water have been exploited before and the case is no different even in the latest times.This factor has been rampant in the agricultural society of California.   An additional factor that has always been with California’s agricu lture is how the absence of water has brought a shape to it. Due to the excess demand of California’s agricultural supplies, it has always been in need of apt water resources.This is exactly why California’s agriculture has always been an active participant of water wars both on an internal and external front.Like each industry, the success of production is dependent on the quality of skills and the quantity of labors that one has for effective working of the operation.   California’s agriculture was no different when it came to labor management and problems that were holed up due to the deficiency of requisite manpower.Due to the varied farming and harvesting techniques in California, the dependency on agricultural labor was a crucial factor in the olden times. Today dependency of agricultural labors is still a crucial part of the Californian agriculture, but with lenient immigration laws, the void has been filled by immigrants from Latin America and Asia.The se immigrant agricultural labors have been actively operating large scale operations on the land and have been instrumental for specialty crop farms. One of the prime decisive factors that have not changed over the course of history is the California’s agriculture’s susceptibility. Farming is one such industry that has always been affected by calamities caused by natural reasons.Agriculture which is wholly dependent on nature’s mercy gets completely dissuaded when natural fury likes floods or droughts occur. Financial crashes also affect agriculture, and California’s agricultural needs have been greatly disturbed by recessions and economic depressions.   It still is at risk when financial market around the world crash, destroying the scope of increasing market needs.California’s agriculture always driven by market needs has always opened up opportunities for functioning of large scale operations. Due to the diversity of operations, agriculture in California has always required specialized management to handle the complexity of such operations and also to monitor the success of these operations.The historic â€Å"Gold rush â€Å", was one of the front running elements that embedded the need for higher technical management in California. With passing of time and advancements in technology, the management that overlooks high end technical operations has been critical for effectuating success.California’s need for higher technologies in agriculture has always been a dominant factor amongst its community. The fact that the entire agriculture has been market oriented, the need to create a niche always existed in the agricultural sector of California.There have always been heavy investments in better technologies and irrigation equipments, large scale operational technologies, pest control are key examples of such technologies.   California agriculture also ventured into food processing and wine making to gratify the ma rket with high end.The capitalist philosophy of California’s agricultural community has been a key element in driving the state towards a technology dependent farming and production.The following will best describe the qualities of a famer, which is best felt by California’s agricultural community:â€Å"The farmer in California, to be successful, must be a skilled agronomist, a careful manager of labor, an astute businessman, a speculator, and certainly an optimist. In recent decades California agriculture has been characterized by a high degree of specialization, seasonality, and reliance (Clarke Chambers. Page 1.1952).

Economics of Love and Marriage - 2065 Words

Introduction: Love is an emotion that we feel for some fellow human beings. Love is a basic dimension of human experience that is variously conveyed as a sense of tender affection, an intense attraction, the foundation of intimacy and good interpersonal chemistry, willing self-sacrifice on behalf of another, and as an ineffable sense of affinity or connection to nature, other living beings, or even that which is unseen. According to Sri Aurobindo : â€Å"There is usually a hope of return, of benefit or advantage of some kind, or of certain pleasures and gratifications, mental, vital or physical that the person loved can give. Remove these things and the love very soon sinks, diminishes or disappears or turns into anger, reproach, indifference†¦show more content†¦It has been found that people who have no hobbies or interests will fall in love more frequently and faster and People who are out of school and working in a boring job will fall in love more frequently and faste r. Materialistic Needs: Primary Needs (Food, Water, Shelter, Transportation)-Primary needs are the minimal needs for survival and happiness. People who are unable to satisfy their primary needs will usually find someone to satisfy these needs. Some research findings in this regard are People in poor countries marry younger and People who do not have cars will be attracted to those who have cars Sexual Needs – This need in people is usually very strong. Sex produces biochemical reactions releasing endorphins and other chemicals that make you feel good. Close intimate contact also relieves stress. Therefore, sex can also be used to fulfill entertainment and safety needs. If this need is properly satisfied then the break up rate is lower whereas impotence and infertility causes stress in a relationship. Materialistic Desires - People have varying materialistic desires. Some people are able to be content with the simple things in l ife. Others could only be happy if they have the finer things in life. These people tend to find these in their lovers. Findings show that rich and powerful people are more attractive to materialistic people than non-materialistic people and the fact thatShow MoreRelatedPride And Prejudice By Jane Austen1732 Words   |  7 PagesIn Pride and Prejudice, the first marriage presented is that of Mr. and Mrs. Bennet. Being the parents of five daughters, the Bennet s marriage set the example for their children yet their relationship did not constitute true love, but more of mutual tolerance. Mrs. Bennet, an obnoxious women with an erratic temper, symbolizes society’s obsession with material wealth and social standing. 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