The Synthesis And Characterization Of Ferrocene Essays -

The Synthesis and Characterization of Ferrocene A Modern Iterative Approach to a Classical Organometallic Laboratory Experiment Pamela S. Tanner, Gennady Dantsin, Stephen M. Gross, Alistair J. Lees, Clifford E. Myers, M. Stanley Whittingham and Wayne E. Jones, Jr. [1] State University of New York at Binghamton, Binghamton, New York 13902 (Funded by the National Science Foundation) (Submitted to J. Chemical Education) -------------------------------------------------------------------------------- Since ferrocene is credited with the rapid acceleration of modern organotransition metal chemistry (1,2) and the cyclopentadienyl group is extensively used as a stabilizing ligand, it is only fitting that the synthesis of ferrocene be incorporated into an advanced undergraduate inorganic laboratory. In our four credit course, the students work in pairs and have the opportunity to select six experiments from a total of nine. Three of these experiments must be selected from the area of materials chemistry and the topics include the synthesis of anhydrous CrCl3, a high temperature superconductor, the ZSM-5 zeolite and the lithium intercalation of WO3. Three wet experiments are also selected. These include the synthesis of W(CO)4, metal complexes of DMSO, a tris(bipyridyl)ruthenium complex, ferrocene, and the acetylation of ferrocene. If ferrocene is selected, it must be done in conjunction with the acetylation of ferrocene and these labs make up two of the three wet labs that are done b y the student. Each lab incorporates an open ended question that the student may answer with the aid of library research or CAChe molecular modeling software with the Project Leader extension. This iterative approach builds confidence in the students ability to explore the unknown and reinforces the basic idea of the scientific method. The ferrocene synthesis has been an extremely successful and popular selection. The students enjoy the diverse technical skills acquired during this experiment. These are techniques that a student may not be introduced to again as an undergraduate and include the use of air-less glassware while working on a vacuum line, cyclic voltammetry, bulk electrolysis, thin-layer and column chromatography. In addition, the compounds are characterized by standard methods such as melting point determination, IR and UV-Vis spectroscopies. -------------------------------------------------------------------------------- Experiments Preparation of Ferrocene Ferrocene is synthesized with a modification of the preparation reported by Jolly (3). The yield in the reported synthesis was 93% (3). Cyclopentadiene undergoes a 4+2 cycloaddition to form dicyclopentadiene. For this reason, cyclopentadiene is usually purified before use. Dicyclopentadiene boils at 170C and cyclopentadiene boils at 42.5 C. For efficiency, the dicyclopentadiene dimer is thermally cracked using a fractional distillation apparatus in advance by the teaching assistant. While this is usually done on the day of the experiment, we have found that cyclopentadiene may be stored without significant dimerization in a foil covered container in a freezer for several days. At the beginning of the lab period, the students grind KOH in a mortar and quickly transfer it to a tared vial. KOH is hygroscopic and should be ground in small portions (2 g). A nitrogen glove bag is a worthwhile investment for this step in the procedure. In addition to protecting the students from the corrosi ve KOH, it ensures that the KOH is dry. The FeCl2.4H20 will also go into solution more effectively if it is finely ground. It is then placed in a tared vial. The pre-weighed KOH (15 g) is placed in a 100 mL (14/20) three-neck round bottom flask equipped with a magnetic stirring bar. 1,2-Dimethoxyethane (30 mL) is added with stirring to the KOH. One side of the neck is stoppered and the other is connected to a vacuum line through a gas adapter. While the mixture is slowly stirred and the flask is being purged with a stream of nitrogen, the cyclopentadiene (2.75 mL) is added. The resulting solution is rose colored. The main neck is then fitted with a pressure equalizing dropping funnel (25 mL) with its stopcock open. In a second one neck round bottom flask that is fitted with a septum, FeCl2.4H20 (3.25 g) and DMSO (12.5 mL) are stirred under a nitrogen atmosphere to dissolve the FeCl2.4H20. After about five minutes, the stopcock is closed and the FeCl2 solution is added to the pressure equalizing dropping funnel. The reaction mixture in the three-neck flask is stirred vigorously and the purging with nitrogen is continued. After about ten minutes, the stopper is placed

rainbow essays

rainbow essays Rainbows A rainbow is one of our atmospheres most exquisite and marvelous creations; "one of the most spectacular light shows observed on earth" (Ahrens, 1998). When a person views a rainbow, they are getting a personal light show that no other person can see as they do. Humphreys points out that: "Since the rainbow is a special distribution of colors (produced in a particular way) with reference to a definite point - the eye of the observer - and as no single distribution can be the same for two separate points, it follows that two observers do not, and cannot, see the same rainbow." (Humphreys, 1929). Of course, a camera lens will record an image of a rainbow which can then be seen my many people (Lynds, 1995). A rainbow is essentially made up of seven brilliant colors: red, orange, yellow, green, blue, indigo, and violet; moreover, it is comprised of many coloration that the eyes cannot see. No painter can manufacture the colors of the rainbow, for they create color by mixing, but no mixing will give red, green, or purple. These are the colors of the rainbow, though between the red and the green an orange color is often seen (Aristotle, 350 BC). To understand how the awesome production of a rainbow occurs is a feat of physics and mathematics. The two most important ingredients are light and drops of water. The manner and position in which the light and water droplets transverse, and the reactions between the two, are complex formulas of nature. Additionally, certain circumstances make it possible for a rainbow to occur. You cannot have a rainbow without some source of light. It is possible to create an artificial rainbow utilizing artificial light, but for this paper, I will only use instances and circumstances of naturally occurring light which produce naturally occurring rainbows. The sun is natures primary source of rainbow creating light; however, occasionally, the light of the moon can produce a rainbow. For a lunar...

Optimal Cognitive Development With the Help of Play Research Paper

Optimal Cognitive Development With the Help of Play - Research Paper Example A potential example of learning according to Piaget’s theory is in a kindergarten classroom. It is noteworthy here that in the kindergarten classroom, children are in the preoperational stage in which, they are egocentric. When a teacher in the kindergarten classroom asks the students to discuss their activity when it snows outside, different children share different thoughts; some might say that they like to make snowmen while others might say that they like making snow angels. None of these responses can be regarded as incorrect because these responses are grounded in children’s personal experiences of being outside in the snow. Such a discussion in the kindergarten classroom helps the children visualize and realize different activities that can be performed out in the snow with the information provided by their fellow classmates. Children in the kindergarten classroom think that the only correct answer to the teacher’s question is theirs since they are egocent ric. It is extremely important to realize different ways of employing the theories of cognitive development. Teachers can use Piaget’s cognitive theory of play in the kindergarten classroom to help the students become master learners. Major components of Piaget’s theory of play will be evidenced in my classroom through the division of the classroom into different centres or sections, each for a different type of play, as well as one where different types of plays can be organized in combination. For example, children will be given musical instruments like pianos and guitars to play.

Humorous exhumation hypocrisy in Moliere's Tartuffe Essay

Humorous exhumation hypocrisy in Moliere's Tartuffe - Essay Example For an instance, the US involvement in the Iraq War can be described satirically as following: Mr. Bush, the President, along with his whole Army led an enterprise in Iraq to beat in the bush. But what he got there ultimately kept him busy with beating about the bush in America. Finally, the innocent Americans with blood-washed hands raised their voice: â€Å"Mr. Bush! Will you please stop beating around the bush? Now It is time to hear about the truth!† The salient ingredients of satire are humor, criticism and moral tone. The object of satire can be any foul and objectionable idea, concept and practice in either an individual or a group. The main literary tool of satire is the use of both sarcastic and mild ironies, sarcasm, exaggeration, etc. But sarcastic satires often pivot on bitterly cynical denunciation that tends to injure its intellectual brilliance. For example, if one says, â€Å"Once upon a time, in Iraq the Americans would chop the tender Iraqi boys and girls and prepared the dishes for the leaders†. This line is not satirical; rather it is sarcastic because it lacks humor as well as wit. Yet a satire can refer to some socially acknowledged taboos such as obscene sexuality, invectives against religion, etc. Griffin Dustin defines satire as following: Satire is a wit contest, a kind of game in which the participants do their worst for the pleasure of themselves and their spectators. . . . If the exchange of insults is serious on one side, playful on the other, the satiric element is reduced. (Dustin 23) Indeed a satire attacks foolishness, follies, vices, wrongs, etc by making fun of them wittily. Moliere’s â€Å"Tartuffe† is such a successful satire that humorously criticizes the religious hypocrisy during the latter half of the Seventeenth Century. Moliere has declared the moral purpose of the play in bold line in the preface of the play: â€Å"distinguish clearly the character of the hypocrite from that of the truly devout man† (Moliere 2). On the surface level, he depicts Tartuffe as a devoutly religious character. But the underlying message of the play is that Tartuffe is ultimately a fraud under the religious apparel. Obviously in the play, the object of his satire is to criticize the late seventeenth century religious hypocrisy with humor and wit. The most remarkable passage that is significant for its role in the satire as a whole is as following: Your husband? Why concern about that rube? He drinks in every story like a boob! If he caught us, en flagra nte, that dull lout, He'd offer up to God a joyful shout! And even when he realized, that clown, He'd chastise you, be careful of your gown! (Act IV Scene V) This passage -in fact, one of Tartuffe’s speeches- is the most precious part of the satire as a whole. Its satirical role is double-folds. On one hand, it exhumes the filthy nature of Tartuffe before his most devout follower, Oregon, who is hiding beneath the table. Indeed such exhumation of Tartuffe’s fraudulence before his most obedient devotee significantly refers to the witty and humorous exhumation of the hypocrisy of Moliere’s contemporary religious institution. On the other hand, it criticizes the blind faith of Oregon, generally the commoners while evoking the convulsion of laughter of the audience. Obviously Oregon stands for the death of common sense that is an essential part of a satire. At the beginning of the play he has been fooled by Tartuffe and remains befooled till this episode. Therefore this passage also contains the moral and pedagogic part of Moliere’s satire. Here Moliere opens Oregon’s as well as the audience’s eyes. In this passage, it is as clear as broad daylight to both Oregon and the

WA3 Assignment Example | Topics and Well Written Essays - 500 words

WA3 - Assignment Example Halmann and Steinberg (1) explain that Earth has blanket like atmospheres that prevent heat from the solar radiation directed from the sun to the earth. The authors point out that the atmosphere maintains the temperature of the earth at 15 degrees Celsius. However, without atmosphere, the temperatures would have been lower, approximately -19 degrees Celsius. This fact can be explained clearly from the lower surface temperatures of the moon. The moon has no atmosphere making it inhabitable, unlike the earth. The earth surface is warm due to blanket like atmosphere; the atmosphere is created by gases in the atmosphere of the earth. The gases are referred to as greenhouse gases because their capability to trap heat. Some of the gases behind the earth’s atmosphere are carbon dioxide and water vapor. Other greenhouse gases include nitrous oxide and methane (Greenhouse Effect). Some of the greenhouse gases mentioned above are carbon dioxide and water vapor. Carbon dioxide CO2 as name suggest has a carbon atom and two-oxygen atoms. Two atoms of oxygen are bonded to CO2. As a molecule, all the three atoms are bonded making it easy to absorb energy from the sun inform of infrared radiation. The infrared radiation is absorbed by the molecule and so the molecule vibrates. Vibrating molecule loses the previously absorbed radiation easily which in turn another molecule absorbs it. This goes in the cycle and in the end the infrared radiation is not lost, therefore, the surface of the earth is kept warm. Nitrous oxide, methane and water vapor does the same as carbon dioxide. Their molecules absorb and lose heat because they are loosely bounded to compound atoms (Greenhouse Effect). Greenhouse gases previously in 19th century were seen as natural functioning gases with positive effects. However, in mid 20th-century people became more concern with greenhouse gases due change of climate and increasing temperatures. Some greenhouse gases such as carbon dioxide,

The Glass Menagerie Title Meaning

The Glass Menagerie Title Meaning Even though the familys relationship towards one another in The Glass Menagerie by Tennessee Williams is both dysfunctional, and questionable you begin to see a deeper meaning to which the title of the story foreshadows. The story begins with the family having supper. As this dinner continues we learn that they are in a single parent household with a mother, Amanda, who is stuck in her youth, a son, Tom, who is trying to separate himself from the dysfunction of his mother, and a daughter, Laura, who has a physical handicap that hinders her from taking part in normal activities including interacting with people. But as the story moves along Laura is somewhat broken out of her shell, Tom moves out, and Amanda develops a closer relationship with her daughter. The title The Glass Menagerie seems to suggest transparency, fragileness, and special attention and care which describe exactly what this family is and needs. Reading the play and basing it in relations to the title it is clear tha t the title has more meaning then meets first glance. Some may argue that the title has no relation what so ever to the play because of things like, who is the mains character? and how the title does not help in defining the underline meaning of the play? These points may very well be true but the question is asked, why is The Glass Menagerie a good title? The glass menagerie is a good title because it leaves a certain mystery to the story, it suggests deeper aspects to the characters in relation to life, and it gives depth to the characters. Â  In the story there is a scene between Tom and Amanda when they are having a confrontation about Tom and where he goes when he leaves home after work. As the argument is escalading Lauras class menagerie breaks. Glass is both fragile and delicate which seems to describe Tom and his mothers relationship, and the breaking of the glass comes at a time when there own relationship cracks. The mystery is why this glass? Why the glass menagerie at this particular time? The suggestive mystery would seem to be the fact they are in some ways like the glass animals and are in cased in a glass case making them venerable, fragile and easily broken. The titles mystery is not just towards the characters weakness, but the mystery of the titles relation to life. It is clear to point out the irrelevance of Amandas Scarlett OHara attitude, toms get away attitude, and Lauras over the top shyness, but there behaviors are not totally irrelevant to real life. At the beginning of the play Tom says I reverse it to that quaint period, the thirties, when the huge middle class of America was matriculating in a school for the blind.(282-83) Tom gave insight to a time period when the economy is struggling due to the great depression. Life in that time was harder, and for Amanda being the only parent in her household it was even tougher. Her reverting back to her past is not at all for fetched or uncommon. Humans tend to go back to happier times in there lives so they are able to cope with the present. All the characters found ways to cope with there situations whether it was skipping school or going to the movies. Lauras defect gave her server introversion that most people suffer from, especially those in her position, and Toms itch to get out of the nes t stems from him getting older and not being able to experience what young men his age do. The weak time period and the fragileness of the economy fit the title and its relevance to life and add a certain depth to each character. The underline meaning of the title helps to add depth to the characters. With out the title the play and its characters would be just that, characters. Because the play uses real life situations it makes it easier to relate to the characters and actually understand each of them. Tom says at the end of the story I didnt go to the moon, I went much further-for time is the longest distance between places.(329) By Tom saying this it shows that these characters are deep and aspire for more then given. By Tom being the narrator he represents all the characters and there insight of how they perceive the world around them. As the play comes to an end you see the characters evolve from being associated from being in a glass case to finding there way out of that enclosure. The Glass Menagerie is no longer a relic or just a title about a glass case, but instead a window into the characters lives. Even through The Glass Menagerie is a great title for such a deep play. Some would not agree that The Glass Menagerie is a good title. Amandas fascination with the past, Lauras inferiority complex (321), and Toms urge to get out is as transparent as the title and is simple as deep as either of the characters get. This could be understood to be true because this family obviously has been this way for quit sometime and there depth cannot be seen pass there ways. Although they seem to not be as deep or as transparent as the title suggest, still there are moments where you are inclined to believe that there is more to them. You see that Amandas reasonings to live in the pass is based on her present and because of that she wants her kids have better lives then she has. Toms unhappiest causes him to write poems, and narrate the play so we are able to understand and know what the familys current situation is about and could find a relation to them and our own lives. Lauras shyness and her b lossoming at the end of the play shows how much more she is as a character and how she is the most important figure in what the title has to do with the play. The more you begin to look out side the box and the more you look at the play for meaning instead of logic the more you see that the title is more interesting then any other title put in its place. Tennessee Williams takes a look into the world of an under class family in the 1930s who have many issue that they may or may not be aware of, and puts it in the fore front so that the readers can feel what these characters feel. He has a mother play both parents because of their broken household and gives her an outlet from her current situation which is recapturing her youth. He brings forth a son who sees his broken family and cannot help or fight the urge to get away so he retreats to watch movies or to drink, and a daughter who is physically handicap and is letting this disability whole her back for becoming the women she should be, and the beauty she should feel. These characters give insight to what is real and ultimately the end to happily ever after. But for this to be bought to anyones attention the title of the story has to be up to pare with what the author is trying to accomplish, and the point that is trying to be proven. Though some argue that choosing The Glass Menage rie as the title of this play gives no meaning to what the plays message truly is, this title makes perfect sense. We are quick to judge what we do not understand therefore to some it would not, but this title goes beyond just words and focus on the meaning. The Glass Menagerie means glass is easily broken, can have cracks, and makes even the tiniest flaws visible, but it can always be repaired. What we see looking in is not whats really going on, but it is what is done to break that glass and let that something out is whats more important.

Essay --

Book Review of January by: Elizabeth Nguyen 8B â€Å"Henry Ford† by Regina Z. Kelly is a non-fiction biography, which follows the life of a clever man born in a town called Greenfield Township, Michigan. This book revolves around Henry’s personal life, his successes, and the problems he faced. Henry was born on July 30, 1863. Over the years, Henry always had a small talent creating and fixing devices. Although he was never the best at literature, he usually found an interest in mechanical things as he grew up. He detested farming, but loved how mechanics worked. In 1879, he decided that he wanted to go work in a mechanic shop in Detroit. He started in the Michigan Car Company, and as the years passed he worked at others, like the Edison Illuminating Company, ran by Thomas Edison. On New Year’s Eve in 1885, Henry met an eighteen year old girl named Clara Bryant, who he soon married three years later. Clara was one of the key people in this book, by being a great supporter to his ideas, even if they seemed unbelievable. Especially the one about the â€Å"horseless carriage.† It was an idea that Henry had thought of. He wanted to create an automobile that wasn’t dependant on horses but rather something better. He soon began to undertake experiments to tr y to create his first automobile. When he personally met Thomas Edison, he gained his approval of Henry’s first automobile he made, and from that day, they grew a strong relationship with each other. They always supported and spent quality time with each other. After resigning from the Edison Illuminating Company in August 15, 1899, The Ford Motor Company was incorporated in 1903 with him and along with others. The Fo... ...gh man who was an executive of the business. Not many people liked him; Henry was only one of his close friends. For me, I would recommend this to other people only under a few circumstances. I find that biographies wouldn’t be a first choice for me, since I’m not really fond with them, unless it’s anyone I find intriguing. Yet, some people may be up for this type of book ¬Ã¢â‚¬â€ personal preference right? Ideally, the ones who enjoy biographies that tell the experiences of people who made an impact on the world would like this. But also, anyone who’s inspired to be a mechanic or a business person would enjoy this book, as they can get an idea of what might be happening in a business environment. Lastly, people ages ten and up will be able to read this book. Any person younger than that may not be able to understand the vocabulary and the main purpose of this biography.