Prayer in Public Schools - 894 Words

Should prayer be allowed in public schools? This is a question with a highly controversial answer. There are many different angles to this question with varying ideas and opinions that never seem to agree with one another. The issue of prayer in public schools has, and will continue to be, at the center of many controversial debates. Just consider the fact that public educational system in United States is a secular or non-religious one that is quick to shut down any religious actions. This is the main reason why it is so difficult to bring forth any kind of change that will bridge the gap between school and religion. There have been several attempts over the years to use the power of the first amendment of the United States constitution which expresses the right to freedom of speech and religion to justify prayer in schools. Although the first amendment clearly sets out to protect religion from government intervention, the U.S Supreme court has ruled prayer in public school â€Å" unconstitutional† because it violates the separation of the church and the state. The separation of the church and state is one of the fundamental principles of U.S. government and law and with it, comes a deep history to back it up. It began many years prior to the establishment of the first public educational institution. Towards the end of the 1700s, many different religious groups began to flourish which made it impossible for them all to be under the control of the states. This is where theShow MoreRelatedThe Prayer On Public Schools1240 Words   |  5 PagesFor much of the 20th Century and into the 21st, school prayer has been the focal point of an ongoing debate about the position of religion in American civilization. The question of the legality of prayer in public schools brings together a number of important notions in American government and legal philosophy. Opponents and proponents of school prayer set forth their arguments in such major constitutional issues as the separation of church and state, the right to free exercise of religion, and theRead M orePrayer in Public Schools656 Words   |  3 PagesThe United States was built on prayer. Prayer or religion is on our currency in the many halls of our justice and federal buildings so no matter where we go, we cannot escape prayer. Our founding fathers did not exclude the bible in building our nation and educating our future and there will be no expectation. No matter what there will be prayer no matter where you are. Some people just don’t believe in God that’s why some don’t want prayer in public school. Though each of the clauses are originallyRead MorePrayer in the Public Schools1111 Words   |  5 PagesPrayer in the Public Schools Diana Brown Everest Online Composition 1-226 ABSTRACT This essay is composed of facts supporting that prayer in Public Schools would be beneficial for the children and the United States of America. Prayer is an address to God or a god in word or thoughts. The Anti- Defamation League states that, â€Å"A moment of silence will inevitably be unconstitutional or the purpose and effect of such moments of silence are invariably to advance religion. The U.S. Supreme CourtRead MorePrayer On Public Schools : The Public School System1032 Words   |  5 PagesAllow Prayer in Public Schools The public school system should allow students, all across the United States of America, to express themselves freely whenever they would like. Most Americans support the idea of allowing students to pray during school. In the year 2001, 66% of Americans voted that they favor the idea of prayer during school; however, 34% opposed the idea of praying during school. In the year 2014, 61% of Americans voted that they support the idea of praying during school; howeverRead MoreThe Prayer Of A Public School768 Words   |  4 PagesMany people in Southern Missouri believe that we need to have more religion in schools. â€Å"Keep Christ in Christmas,† â€Å"One nation under God,† and post the Ten Commandments on every wall in public buildings. This is an easy rallying cry because most people in rural Southwest Missouri share the same Christian beliefs. There is a place for these types of soapboxes. That place is called church. Schools are designed to prepare students for the college and career. Churches are designed to prepare congregationsRead MoreEssay on Prayer in Public Schools1051 Words   |  5 PagesPrayer in Public Schools An issue that has been constantly debated for years is whether voluntary prayer in public schools should be permitted. A student should be allowed to pray voluntarily at the beginning of each school day based on many reasons. Prayer based on moral beliefs reinforce good citizenship as defined by our forefathers. A daily reminder of a need for the belief of good over evil is a necessary part of this society. Daily voluntary school prayer should be re-instated in publicRead More No Prayer in Public Schools Essay746 Words   |  3 PagesNo Prayer in Public Schools Chapter three of Civil Liberties: Opposing Viewpoints inspired me to research today’s issues of school prayer. To understand how we got to where we are today, I first delved into our countries history of court cases pertaining to rulings on prayer in schools. Lastly, to update my audience on how our lives are being affected today, I directed my efforts toward finding current situations. By analyzing these situations, I gained knowledge for a better understanding ofRead MorePrayer in Public Schools Essay1440 Words   |  6 Pagestype of school students attend, organized prayer is mandatory, allowed, or banned. In the United States, organized prayer in public schools is prohibited because it goes against the Constitution’s separation of church and state (Jinkins 123). The United States promises religious freedom, but is yet to define the degree and limitation of that liberty. However, American citizens have been debating for many years, whether organized prayer should be an option or obligation in public schools. Some peopleRead More Prayer in Public School Essay3032 Words   |  13 Pagesthere is a way to express ones deepest thoughts and feelings--prayer. Prayer is something that most people due naturally. Whether it is in the morning before you start your day, before a meal, before you go to sleep, or when you just feel the need to express your feelings, prayer is always there. Religious faiths believe that this is central to human life. Even those who are not religious pray. Prayer affects the material universe. Prayer can be defined as an earnest request; a humble entreaty addressedRead More No Prayer in the Public Schools Essay3232 Words   |  13 Pages   Ã‚  Ã‚   Over the past three decades, the issue of the role of prayer in the public school system has become increasingly controversial. The current debate juggles the opposing interpretations of the exact intentions of Americas Founders, who came from an other country, England, in pursuite of expanded freedoms. The first colonists in the 17th century especially desired religious freedom, because their former British government forced them all to learn and practice a centralized religion. Consequently

Case Study Hunt Construction Group Inc. - 1657 Words

Case Number and Title United States Court of Appeals Seventh Circuit, Case Number 06-4335 Hunt Construction Group Inc. vs. Allianz Global Risks U.S. Insurance Company Parties Involved †¢ Hunt Construction Group Inc.; Plaintiff-Appellant †¢ Allianz Global Risks U.S. Insurance Company; Defendant-Appellee †¢ Seventh Circuit of Appeals Presiding Judges: o Richard A. Posner o Joel M. Flaum o Daniel A. Manion Project Specifications (Name, Type, Contract Amount, Location) Name: Edward H. McNamara Midfield Terminal (Northwest WorldGateway) Type: Airport Main Terminal Contract Value: $420M Location: Detroit, Michigan Place and Date of Case Place: Detroit, Michigan Date Decided: October 1st, 2007 Summary: The Plaintiff, Hunt Construction†¦show more content†¦The insurance policy issued to hunt did cover fire damage, as most builders risk policies due; however, it also covered almost every other kind of damage that a construction company might encounter as well, and Hunts damages were mostly caused due to water damage. In order for Allianz to call the builders risk policy a fire insurance policy, and subject the policy to have the Plaintiff seek indemnification that was not caused by fire or means covered in a â€Å"fire insurance policy†, there are several ramifications involved. Fire is one of the risks of a construction project against which Allianz’s policy insures; yet it is only one, and given the wide range coverage of the policy, it seemed odd to the presiding judges to classify it as a fire risk insurance policy. A fire insurance policy is subjected to 19 separate requirements, and until 1990, Michigan legislature, rather than trying to define â€Å"fire insurance policy†, provided that a â€Å"standard fire policy† (with all 19 mandatory minimum provisions) would not be required for a variety of types of insurance. The structure of this Michigan statute implied any form of insurance that was not exempt was a â€Å"standard fire policy†, including a builders risk policy, and so the 19 mandatory provisions would have to have been included when indemnity was sought after. However, this legislature was repealed in 1990, well before Allianz issued the

Riordan Manufacturing Accounting Systems, Part Ii Free Essays

RiordanManufacturingAccounting Systems, Part II Business Systems I/BSA 500 November 19, 2012 LiseHautzinger Riordan Manufacturing Accounting Systems, Part II Comprehensive accounting systems and practices assist companies in monitoring cash flow expenses and investments as well as identify new sources of income. Riordan Manufacturing’s current accounting system lacks consistency across multiple locations and basic accounting modules. Each location has a closed system and dos not incorporate other department systems such as Marketing and Sales, Production, and Operations. We will write a custom essay sample on Riordan Manufacturing Accounting Systems, Part Ii or any similar topic only for you Order Now Streamlining each accounting system to include the basic accounting modules and incorporating other company systems will help to ensure compliance and identify spending costs and potential capital investments. With the three operating entities (Georgia, Michigan, and California) and the joint venture in the People’s Republic of China, Riordan Manufacturing has a complex accounting setup. All information gathered from the operating entities is compiled at their corporate office in San Jose, California. Similar to that of other companies, Riordan Manufacturing must ensure that there is cohesion between the various entities by instilling basic use of accounting functions and methods. Although the accounting configuration and distribution is transparent to their customers and suppliers, the aggregation process is complex. The recommendations presented by Team A will help to build an integrated approach to their accounting and distribution setup. At a minimum, the basic components of each operating entity accounting system include the following functions: General Ledger, Accounts Payable, Accounts Receivable, and Inventory. The company has published balance sheet information that shows this level of data by comparing fiscal year ending September 30, 2010 vs. September 30, 2011. Assets for the Riordan Manufacturing include the following: information received from General Ledger, Accounts Payable, Accounts Receivable, and Inventories. Fiscal year ending September 2011 yield total assets of $47,409,137 compared to fiscal year 2010 numbers of $34,825,498. That is an increase of $12,583,639 or approximately 26. % in 2011 compared to 2010 assets. In addition to the aforementioned accounting functions, Riordan Manufacturing uses the standard accounting methods of cash and accrual. Both methods are similar, but one of these methods will be used based on timing. In financial reporting, the cash method of accounting is used when accounting records revenue when cash from customers is received, and records expenses when they are paid in cash (Sanker, 2012). Therefore, cash basis does not recognize accounts receivab le or payable. Conversely, accrual method of account include items when they are earned in addition to claiming deductions when expenses are incurred (Sanker, 2012). There are plenty of software programs available to help an organization’s accounting needs. With so many available finding the right software program can be a burden. Evaluating the needs of an organization as well as the size of the organization will help one find the correct software program. When selecting the software program it should be upgradeable for future needs as well as be able to troubleshoot and fix any errors in the program. The cost of the accounting software will also play a huge part in deciding on an accounting program. Riordan Manufacturing has multiple divisions of the company. When it comes to accounting software there are different programs used throughout Riordan Manufacturing. The San Jose plant use a different accounting software program than the Michigan and Georgia plants. This often causes a delay in financial reporting, which has caused Riordan Manufacturing investor’s confidence to decrease. The delay will also impact the outcome of future capital investments. When are there errors in accounting and financial documents this will often lead to errors and spark costly audits (Perry, 2006). The different departments of accounting such as accounts payable, accounts receivable, and order entry need to be maintained by one system and an individual server with mirroring will suffice for the above needs and of course, a proper backup solution will be for safekeeping of this data (Perry, 2006). Microsoft produces a program that can meet the needs of Riordan Manufacturing. Solomon Great Plains program is the recommendation for Riordan Manufacturing. The functions needed by Riordan Manufacturing and pricing makes this the logical choice for accounting software. This program will allow all divisions to report back to the central point, therefore providing instance reports. One must find a compatible program that works well with the system currently in place. Riordan Manufacturing requires certain systems to create an effective and efficient accounting system. Systems such as sales, accounting, financing and human resources need to have access to the accounting system (Apollo Group, Inc. , 2012). Point of sale and cash register systems must continuously, during business hours, be connected to the accounting system. Reason being, sales are tracked and verified instantaneously. Inventory must also be considered within the accounting system to make certain that all inventory levels are monitored and replenish without user input. Monetary needs for inventory replenishing is tracked within the accounting software system. Billable hours must be tracked for cost purposes to make certain the company is working within budgetary and time constraints. The accounting systems directly connected to accounting software must also contain the general ledger accounts, accounts payable, and accounts receivable. Purchase orders for plastics orders must generate bills to customers. Collections must also have access to the company’s accounting system because many times bills do not get paid, therefore collection action must be pursued. These requirements must also be as secure as possible, behind a firewall, and virtual local area network (VLAN). Expense accounts must also be tracked within the accounting software to make certain every expense is accounted for. Finally, payroll, which includes salary and wages, payroll taxes, and deductions must be accounted for and budgeted. Integrating different modules provide a well-rounded accounting software package with the ability to keep management informed of the financial status of the company. Riordan’s current system does not include basic accounting departmental functions or modules. The company must devote funds and time to generate accurate Income Statements, Balance Sheets and the General Ledger in a consolidated effort with external auditors. As a result, a coordinated effort should be made to consolidate systems, link associated databases, and purchase appropriate accounting software. Purchase or development of software will reduce data redundancies and increase efficiency and productivity. By undertaking these measures Riordan will be able to ensure compliance, therefore cutting costs, and focus on identifying new sources of revenues and cost savings initiatives. References Apollo Group, Inc. (2012). Riordan manufacturing – intranet. Retrieved on November 4, 2012, from https://ecampus. hoenix. edu/secure/aapd/cist/vop/Business/Riordan/index. asp University of Phoenix. (2010). BSA/500 course notes. Retrieved from University of Phoenix, BSA500 – Business Systems I website. Perry, Cornell. (2006). Riordan Manufacturing Proposal. Retrieved November 18, 2012 from http://www. scribd. com/doc/48198199/Riordan-Manufacturing-Proposal Sanker, S. (2012). Accounting Methods: Cash vs. Accrual. Small Business Chronicle. Retrieved November 19, 2012, from http://smallbusiness. chron. com/accounting-methods-cash-vs-accrual-3732. html How to cite Riordan Manufacturing Accounting Systems, Part Ii, Essay examples

Dramatic speeches Essay Example For Students

Dramatic speeches Essay The Crucible: Arthur Miller builds up tension for the audience by a skilful use of dialogue, dramatic speeches, entrances and actions. By discussing at least one example of each from Act Two say how he does this. Arthur Millers The Crucible is set in Salem, Massachusetts where they didnt understand either medicine or science. They thought when someone became ill it was because either God was punishing them or witchcraft was at work. The Crucible is based on a group of teenage girls who are discovered dancing naked in the woods, playing with witchcraft. When the girls realised how severe their punishment would be, they claimed other members of the community possessed them. There was no defence against witchcraft. If people denied it they were hung, as they believed they were possessed by the devil. If people admitted it they were put in jail. Anyone who was accused had his or her life ruined. The group of girls lead by Abigail Williams began accusing perfectly innocent members of the community of witchcraft. Usually the people accused were outcasts such as beggars or old women who lived alone, but respectable women were finding they too were being accused. Take Elizabeth Proctor, she was accused because Abigail Williams wanted her out of the way so she could continue her affair with her husband John Proctor. In Act two there is an immense row between Elizabeth and John Proctor about two main points: the fact that Elizabeth has been accused and Johns affair with Abigail. Miller expresses their anger by the vulgar language they use, the exclamations and the questions asked. Then you go and tell her shes a Whore. Whatever promise she may sense break it, John, break it. This was what Elizabeth said to John. This would astound the audience because Elizabeth was a respectable woman and would not be expected to use such ill-mannered language. The fact that Elizabeth had used such language would make the audience unbelievably stunned; it would also increase the tension tremendously. Not only dose Elizabeth use foul language she orders John to go and break the relationship between Abigail and himself. This shows Elizabeths anger, as she is livid and not asking but ordering John to do as she wishes. Elizabeths anger is also shown by the use or repetition: Oh, the noose, the noose is up! Elizabeth is scared as she has been accused and thinks she is going to be hung. She is hysterical and this is shown with the use of exclamations and repetition. This too would make the audience anxious. Half way through Act 2 there is an enormous burst of stimulation and apprehension for the audience. This is when Giles and Francis burst in on a particularly anxious moment between John, Elizabeth and Hale. Giles and Francis intensify the tension by announcing the startling news that both their wives have been arrested. This comes as a shock because both their wives are exceptionally respectable women. The tension is show by the respondents using exclamations. Rebeccas in the jail! This comes as a shock because like Elizabeth, Martha and Rebecca are highly regarded women. Now they have been arrested there is a grater chance that Elizabeth too will be arrested.

Faustus Renaissance Martyr Or Tragic Hero Faustus Died A Death That F

Faustus: Renaissance Martyr or Tragic Hero Faustus died a death that few could bear to imagine, much less experience. After knowing for many years when exactly he would die, he reached the stroke of the hour of his destiny in a cowardly, horrid demeanor. Finally, when the devils appeared at the stroke of midnight, tearing at his flesh as they draw him into his eternal torment, he screams for mercy without a soul, not even God Himself, to help him. However, what to consider Doctor John Faustus from Christopher Marlow's dramatic masterpiece The Tragical History of the Life and Death of Doctor Faustus is a very debatable issue. For example, one can see that he threw his life away for the sake of knowledge, becoming obsessed with the knowledge that he could possess. In this case, he is unarguably a medieval tragic hero. However, when considering the fact that he died for the sake of gaining knowledge, pushing the limits of what is possible in spite of obvious limitations and, eventually, paying the ultimate penalty, he could be considered a Renaissance martyr. These two points of view have their obvious differences, and depending on from what time period one chooses to place this piece of literature varies the way that the play is viewed. However, the idea of considering him a martyr has many flaws, several of which are evident when considering who Faustus was before he turned to necromancy and what he did once he obtained the powers of the universe. Therefore, inevitably, the audience in this play should realize that Faustus was a great man who did many great things, but because of his hubris and his lack of vision, he died the most tragic of heroes. Christopher Marlowe was borne on February 6, 1564 (Discovering Christopher Marlowe 2), in Canterbury, England, and baptized at St. George's Church on the 26th of the same month, exactly two months before William Shakespeare was baptized at Stratford-upon-Avon (Henderson 275). He was the eldest son of John Marlowe of the Shoemaker's Guild and Katherine Arthur, a Dover girl of yeoman stock (Henderson 275). Upon graduating King's School, Canterbury, he received a six-year scholarship to Cambridge upon the condition that he studies for the church. He went to Cambridge, but had to be reviewed by the Privy Council before the university could award him his M.A. degree because of his supposed abandonment of going to church. He was awarded his degree in July of 1587 at the age of twenty-three after the Privy Council had convinced Cambridge authorities that he had behaved himself orderly and discreetly whereby he had done Her Majesty good service (Henderson 276). After this, he completed his education from Cambridge over a period of six years. During this time he wrote some plays, including Hero and Leander, along with translating others, such as Ovid's Amores and Book I of Lucan's Pharsalia (Henderson 276). During the next five years he lived in London where he wrote and produced some of his plays and traveled a great deal on government commissions, something that he had done while trying to earn his M.A. degree. In 1589, however, he was imprisoned for taking part in a street fight in which a man was killed; later he was discharged with a warning to keep the peace (Henderson 276). He failed to do so; three years later he was summoned to court for assaulting two Shoreditch constables, although there is no knowledge on whether or not he answered these charges (Henderson 276). Later Marlowe was suspected of being involved in the siege of Roven where troops were sent to contain some Protestants who were causing unrest in spite of the Catholic League. Then, after sharing a room with a fellow writer Thomas Kyd, he was accused by Kyd for having heretical papers which denied the deity of Jesus Christ (Discovering Christopher Marlowe 2). Finally, a certain Richard Baines accused him of being an atheist. Before he could answer any of these charges, however, he was violently stabbed above his right eye while in a fight Ingram Frizer (Discovering Christopher Marlowe 2). Doctor Faustus could be considered one of Marlowe's masterpieces of drama. It was his turn from politics, which he established himself in with his plays Edward II and Tamburlaine the Great, to principalities and power. In it he asks the reader to analyze what the limits are for human power and knowledge and ponder what would happen if one man tried to exceed those limits. The play opens up with Faustus, who is supposedly the most learned man in the world, talking about how he has mastered every field of knowledge known to man. He is bored with theology, finding that man is doomed no matter what happens, and he

Police and Career Choice Essay Example

Police and Career Choice Essay Example Police and Career Choice Essay Police and Career Choice Essay

Choose a specific cultural policy(either national, regional,local..)in Essay

Choose a specific cultural policy(either national, regional,local..)in a particular place and period. Investigate its background,analyse its development and eva - Essay Example ‘Roots’ was a national television event of enormous educational value that necessarily showed the brutality of the institution of slavery. The made-for-television movie ‘The Burning Bed’ was credited with bringing about reform of existing spousal-abuse laws and included what some would call disturbingly violent scenes† (â€Å"ACLU Comments†, 2004). Hollywood success in America has demonstrated the great extent to which the film industry can function to increase the economy, define national opinions and sentiment and preserve cultural heritage while encouraging individual creativity. Although Britain saw a short pioneering period in the industry in the late 1800s and early 1900s, it has since fallen into some disrespect, proving unable to support its superior talent, frequently losing them to Hollywood or other markets and losing out on these positive benefits, although it has been working hard to foster increased interest and participation. In a n effort to increase the appeal of the British film industry, a number of policies and programs have been put in place over the years designed to encourage participation and support of the industry. However, there are areas in which film can cause significant damage to a society, in the introduction to too much violence, for instance, or in misleading political propaganda. This trivializing of important issues is most traceable in television as news programs filter out what they feel to be important – the breaking news story – against what they feel is old hat – long-term political issues such as social welfare, etc. â€Å"Television predominantly is a source of entertainment. If it also is the source of people’s news and involvement in public issues, there is a high risk that they will interpret that information within a framework provided by entertainment. If politics is like sport, for instance, it is fitting that

Biomechnics lab report Essay Example | Topics and Well Written Essays - 1500 words

Biomechnics lab report - Essay Example The change in the horizontal velocity during the braking, propulsive and stance phase are calculated. In the results the changes are summarized and the variables are presented in relation to the body weight of the individual rather than in Newtons. The discussion includes the explanation of the general pattern of the Fz- and Fy- time traces an dthe change in magnitude of the Ground Reaction Force (GRF) variables between each running speed. The paper aims to investigate the effect of increasing running speed on ground reaction force (GRF) related variables. According to the Newton’s Law of Gravitation, any two objects with masses attract each other and the magnitude of this attracting force is proportional to the product of the masses and inversely proportional to the square of the distance. The gravitational force acted upon an object by the earth is called gravity or weight of the object. Since we always have contact with the ground due to this gravity there is always an interaction between our bodies and the ground. The reaction from the ground is called the Ground Reaction Force (GRF). The GRF is important external force acting upon the human body in motion. This force is used as propulsion to initiate and control the movement. A single male weighing 74kg uninjured participant was subjected to an exercise to determine the ground reaction force. Following habituation, GRF was recorded while he was running across the Kistler Force Plate five times at 3, 4 and 5 m-s-1 10% . Following each trial during the laboratory session, a MS-Excel spreadsheet containing Fz (i.e the vertical component of GRF) and the Fy (i.e. the anterior-posterior component of GRF) versus time data and the braking and propulsive impulse were produced. From this raw data, we will need to obtain the magnitude of the following GRF related variables (shown in fig. 1) for each trial. Calculation of the changes in horizontal velocity during the braking

Magnet Schools and the Pursuit of Racial Balance Essay

Magnet Schools and the Pursuit of Racial Balance - Essay Example There are 3 goals of magnet schools - to reduce minority isolation, to eliminate minority isolation and to prevent minority enrolment. Out of 54 schools in Cincinnati sample frame 10 magnet schools and 10 non magnet schools were selected. A questionnaire was distributed to all the fifth grade parents and to all non administrative staff in each school of the selected temple. Magnet schools are a tool for racial balance. Many parents believe that the goal of integration is beneficial for both the parents as well as the students. In conclusion we may say that the students will derive benefits from encounters with students from different races. In 1802, Nassau Hall was consumed by fire, the next year Dickson College's building was burned down likewise there were many such college buildings which were either burned or affected by other natural calamities like lightening. Often when a college had a building, it had no students and when it had students it had no buildings. And it if had both than it didn't have money, professors or president. College founding in the 19th century was undertaken with the same spirit as canal-building, farming etc. Yale men were responsible for setting up Christian goals in the west. For the Methodists and the Baptists founding colleges became a part of their process of coming to terms with middle class societies.

Coordination Compounds and Ligands

Coordination Compounds and Ligands In order to explain the formulae and structures of the complex compounds, or complexes, formed by transition metal salts with molecular species such as ammonia, Werner coined the terms primary valence and secondary valence, as explained in Chapter 1. These concepts remain valid today except that the term oxidation state has replaced primary valence and the term coordination number has replaced secondary valence. Werner had recognized that a transition metal salt could form a complex compound in which the metal ion became bonded to a number of groups which need not necessarily be the counter anions originally present in the salt. The orientations in space of these metal-bound groups would lead to the complex having a particular geometric structure. In this chapter the structures of transition element complexes are examined in more detail and some definitions of key terms are provided. One definition of a metal complex or coordination compound is a compound formed from a Lewis acid and a Brà ¸nsted base, a Lewis acid being an electron pair acceptor and a Brà ¸nsted base a proton acceptor. Thus the interaction of the Lewis acid metal centre in Ni(ClO4)2 with the Brà ¸nsted base ammonia to form a complex according to equation 4.1 Ni(ClO4)2 + 6NH3 † Ã¢â‚¬â„¢ [Ni(NH3)6](ClO4)2 (4.1) provides an example of the formation of a coordination compound. In writing the formulae of metal complexes it is conventional to include the complete coordination complex within square brackets, an example being provided by [Co(NH3)5Cl]Cl2, in which the coordination complex is [Co(NH3)5Cl]2+ with two chloride counterions. The Brà ¸nsted bases attached to the metal ion in such compounds are called ligands. These may be simple ions such as Cl-, small molecules such as H2O or NH3, larger molecules such as H2NCH2CH2NH2 or N(CH2CH2NH2)3, or even macromolecules, such as proteins. The co ordination number (CN) of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded. In the case of [Co(NH3)5Cl]2+ this will be 6, the sum of one chloride and five ammonia ligands each donating an electron pair. Although this definition usually works well for coordination compounds, it is not always appropriate for organometallic compounds. An alternative definition of CN would be the number of electron pairs arising from the ligand donor atoms to which the metal is directly bonded. To apply this definition, it is necessary to assume an ionic formulation and a particular oxidation state for the metal ion, so that charges can be assigned to the ligands as appropriate and the number of electron pairs determined. Types of Ligand Where a ligand is bound to a metal ion through a single donor atom, as with Cl-, H2O or NH3, the ligand is said to be unidentate (the ligand binds to the metal through a single point of attachment as if it had one  tooth). Where two donor atoms can be used to bind to a metal ion, as with H2NCH2CH2NH2, the ligand is said to be bidentate, and where several donor atoms are present in a single ligand as with N(CH2CH2NH2)3, the ligand is said to be polydentate. When a bi- or polydentate ligand uses two or more donor atoms to bind to a single metal ion, it is said to form a chelate complex (from the Greek for claw). Such complexes tend to be more stable than similar complexes containing unidentate ligands. A huge variety of ligands appear in coordination complexes, Any of a variety of elements may function as donor atoms towards metal ions, but the most commonly encountered are probably nitrogen, phosphorus, oxygen, sulfur and the halides. In addition, a large number of compounds are kno wn which contain carbon donor atoms; these are known as organometallic compounds. Bidentate ligands may be classified according to the number of atoms in the ligand which separate the donor atoms and hence the size of the chelate ring formed with the metal ion. Thus 1,1-ligands form a four-membered chelate ring when bound to a metal ion, 1,2-ligands a five membered ring, and so on. Cyclic compounds which contain donor atoms oriented so that they can bind to a metal ion and which are large enough to encircle it are known as macrocyclic proligands. Bicyclic proligands are also known which can completely encapsulate a metal ion. Some of these systems have given the names cryptand or sepulchrate, Certain polydentate ligands are particularly good at linking together several metal ions and are refered to as polynucleating ligands. Geometry In coordination chemistry, a structure is first described by its coordination number, the number of ligands attached to the metal (more specifically, the number of à Ã†â€™-type bonds between ligand(s) and the central atom). Usually one can count the ligands attached, but sometimes even the counting can become ambiguous. Coordination numbers are normally between two and nine, but large numbers of ligands are not uncommon for the lanthanides and actinides. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Metal ions may have more than one coordination number. Typically the chemistry of complexes is dominated by interactions between s and p molecular orbitals of the ligands and the d orbitals of the metal ions. The s, p, and d orbitals of the metal can accommodate 18 electrons (see 18-Electron rule; for f-block elements, this extends to 32 electrons). The maximum coordination number for a certain metal is thus related to the electronic configuration of the metal ion (more specifically, the number of empty orbitals) and to the ratio of the size of the ligands and the metal ion. Large metals and small ligands lead to high coordination numbers, e.g. [Mo(CN)8]4-. Small metals with large ligands lead to low coordination numbers, e.g. Pt[P(CMe3)]2. Due to their large size, lanthanides, actinides, and early transition metals tend to have high coordination numbers. Different ligand structural arrangements result from the coordination number. Most structures follow the points-on-a-sphere pattern (or, as if the central atom were in the middle of a polyhedron where the corners of that shape are the locations of the ligands), where orbital overlap (between ligand and metal orbitals) and ligand-ligand repulsions tend to lead to certain regular geometries. The most observed geometries are listed below, but there are many cases which deviate from a regular geometry, e.g. due to the use of ligands of different types (which results in irregular bond lengths; the coordination atoms do not follow a points-on-a-sphere pattern), due to the size of ligands, or due to electronic effects (see e.g. Jahn-Teller distortion): Linear for two-coordination, Trigonal planar for three-coordination, Tetrahedral or square planar for four-coordination Trigonal bipyramidal or square pyramidal for five-coordination, Octahedral (orthogonal) or trigonal prismatic for six-coordination, Pentagonal bipyramidal for seven-coordination, Square antiprismatic for eight-coordination, and Tri-capped trigonal prismatic (Triaugmented triangular prism) for nine coordination. Some exceptions and provisions should be noted: The idealized descriptions of 5-, 7-, 8-, and 9- coordination are often indistinct geometrically from alternative structures with slightly different L-M-L (ligand-metal-ligand) angles. The classic example of this is the difference between square pyramidal and trigonal bipyramidal structures. Due to special electronic effects such as (second-order) Jahn-Teller stabilization, certain geometries are stabilized relative to the other possibilities, e.g. for some compounds the trigonal prismatic geometry is stabilized relative to octahedral structures for six-coordination. Isomerism The arrangement of the ligands is fixed for a given complex, but in some cases it is mutable by a reaction that forms another stable isomer. There exist many kinds of isomerism in coordination complexes, just as in many other compounds. Stereoisomerism Stereoisomerism occurs with the same bonds in different orientations relative to one another. Stereoisomerism can be further classified into: Cis-trans isomerism and facial-meridional isomerism Cis-trans isomerism occurs in octahedral and square planar complexes (but not tetrahedral). When two ligands are mutually adjacent they are said to be cis, when opposite each other, trans. When three identical ligands occupy one face of an octahedron, the isomer is said to be facial, or fac. In a fac isomer, any two identical ligands are adjacent or cis to each other. If these three ligands and the metal ion are in one plane, the isomer is said to be meridional, or mer. A mer isomer can be considered as a combination of a trans and a cis, since it contains both trans and cis pairs of identical ligands. Optical isomerism Optical isomerism occurs when the mirror image of a compound is not superimposable with the original compound. It is so called because such isomers are optically active, that is, they rotate the plane of polarized light. The symbol Άº (lambda) is used as a prefix to describe the left-handed propeller twist formed by three bidentate ligands, as shown. Similarly, the symbol Ά (delta) is used as a prefix for the right-handed propeller twist.[7] Structural isomerism Structural isomerism occurs when the bonds are themselves different. Linkage isomerism is only one of several types of structural isomerism in coordination complexes (as well as other classes of chemical compounds). Linkage isomerism occurs with ambidentate ligands which can bind in more than one place. For example, NO2 is an ambidentate ligand: it can bind to a metal at either the N atom or at an O atom. http://t2.gstatic.com/images?q=tbn:ANd9GcRKxYHqV_eczrlInNE3ZAbZOBh-Q1JBpMbyWoRehkKI8y1KEukt=1usg=__PClvZyGR5yoOsiA5HEgW1Zjyvko= Naming Coordination Compounds A complex is a substance in which a metal atom or ion is associated with a group of neutral molecules or anions called ligands. Coordination compounds are neutral substances (i.e. uncharged) in which at least one ion is present as a complex. You will learn more about coordination compounds in the lab lectures of experiment 4 in this course. The coordination compounds are named in the following way. (At the end of this tutorial we have some examples to show you how coordination compounds are named.) A. To name a coordination compound, no matter whether the complex ion is the cation or the anion, always name the cation before the anion. (This is just like naming an ionic compound.) B. In naming the complex ion: 1. Name the ligands first, in alphabetical order, then the metal atom or ion. Note: The metal atom or ion is written before the ligands in the chemical formula. 2. The names of some common ligands are listed in Table 1. For anionic ligands end in -o; for anions that end in -ide(e.g. chloride), -ate (e.g. sulfate, nitrate), and -ite (e.g. nirite), change the endings as follows: -ide http://www.chemistry.wustl.edu/~edudev/LabTutorials/arrow.jpg-o; -ate http://www.chemistry.wustl.edu/~edudev/LabTutorials/arrow.jpg-ato; -ite http://www.chemistry.wustl.edu/~edudev/LabTutorials/arrow.jpg-ito For neutral ligands, the common name of the molecule is used e.g. H2NCH2CH2NH2 (ethylenediamine). Important exceptions: water is called aqua, ammonia is called ammine, carbon monoxide is called carbonyl, and the N2 and O2 are called dinitrogen and dioxygen. 3. Greek prefixes are used to designate the number of each type of ligand in the complex ion, e.g. di-, tri- and tetra-. If the ligand already contains a Greek prefix (e.g. ethylenediamine) or if it is polydentate ligands (ie. can attach at more than one binding site) the prefixes bis-, tris-, tetrakis-, pentakis-, are used instead. (See examples 3 and 4.) The numerical prefixes are listed in Table 2. 4. After naming the ligands, name the central metal. If the complex ion is a cation, the metal is named same as the element. For example, Co in a complex cation is call cobalt and Pt is called platinum. (See examples 1-4). If the complex ion is an anion, the name of the metal ends with the suffix -ate. (See examples 5 and 6.). For example, Co in a complex anion is called cobaltate and Pt is called platinate. For some metals, the Latin names are used in the complex anions e.g. Fe is called ferrate (not ironate). 5. Following the name of the metal, the oxidation state of the metal in the complex is given as a Roman numeral in parentheses. C. To name a neutral complex molecule, follow the rules of naming a complex cation. Remember: Name the (possibly complex) cation BEFORE the (possibly complex) anion.See examples 7 and 8. For historic reasons, some coordination compounds are called by their common names. For example, Fe(CN)63à ¯Ã¢â€š ¬Ã‚ ­ and Fe(CN)64à ¯Ã¢â€š ¬Ã‚ ­ are named ferricyanide and ferrocyanide respectively, and Fe(CO)5 is called iron carbonyl. Examples Give the systematic names for the following coordination compounds: 1. [Cr(NH3)3(H2O)3]Cl3 Answer: triamminetriaquachromium(III) chloride Solution: The complex ion is inside the parentheses, which is a cation. The ammine ligands are named before the aqua ligands according to alphabetical order. Since there are three chlorides binding with the complex ion, the charge on the complex ion must be +3 ( since the compound is electrically neutral). From the charge on the complex ion and the charge on the ligands, we can calculate the oxidation number of the metal. In this example, all the ligands are neutral molecules. Therefore, the oxidation number of chromium must be same as the charge of the complex ion, +3. K4[Fe(CN)6] Answer: potassium hexacyanoferrate(II) Solution: potassium is the cation and the complex ion is the anion. Since there are 4 K+ binding with a complex ion, the charge on the complex ion must be à ¯Ã¢â€š ¬Ã‚ ­ 4. Since each ligand carries -1 charge, the oxidation number of Fe must be +2. The common name of this compound is potassium ferrocyanide. Applications of Co-ordination Compounds (1) Estimation of hardness in water, as Ca++   and Mg2+   ions form complexes with EDTA. (2) Animal and plant world e.g. chlorophyll is a complex of Mg2+   and haemoglobin is a complex of Fe2+   vitamin B12   is a complex of Co2+. (3) Electroplating of metals involves the use of complex salt as electrolytes e.g. K[Ag(CN)2] in silver plating. (4) Extraction of metals e.g. Ag and Au are extracted from ores by dissolving in NaCN to form complexes. (5) Estimation and detection of metal ions e.g. Ni2+ ion is estimated using dimethyl glyoxime. (6) Medicines e.g. cis-platin i.e. cis [PtCl2(NH3)2]   is used in treatment in cancer Importance and Applications of Coordination Compounds: Importance and applications of coordination compounds find use in many qualitative and quantitative chemical analyses. The familiar color reactions given by metal ions with number of ligands. Similarly purification of metal can be achieved through formation and sub sequence decomposition of their coordination compounds. Inflexibility of water is predictable by simple titration with Na2EDTA.the Ca2+ and Mg2+ ions form stable complex with EDTA. The selective estimation of these ions can be done due to difference in the stability constants of calcium and magnesium complexes. Some important extraction processes of metals like those of silver and gold, make use of complex formation. Importance and applications of coordination compounds are of great importance in biological system. The pigment responsible for photosynthesis chlorophyll is a coordinated compound of magnesium. Haemoglobin, the red pigment of blood which acts as oxygen carrier is a coordination compound of iron. Coordination compounds are used as catalysts for many industrial processes. Applications of articles can be electroplating with the silver and gold much more smoothly and evenly from the solution of the complexes. In black and white photography, the developed film is fixed by washing with hypo solution which dissolves the unrecompensed AgBr to from a complex ion [Ag9S2O3)2]3- There is growing interest in the user of chelate therapy in medicinal chemistry. An example is the treatment of problem caused by the presence of metal in toxic proportion in plant and animal. Thus, excess of copper and iron are removed by chelating ligands D-penicillamine and desferrioxime B via the formation of the coordination compounds. EDTA is use in the conduct of guide poisoning. Some coordination compounds of platinum effectively inhibit the growth of tumours. Sonochemical Asymmetric Hydrogenation with Palladium Enantioselective hydrogenation is one of the most versatile methods of asymmetric synthesis, with heterogeneous catalysis, using chiral modifiers, rapidly becoming an alternative to the .traditional. homogeneous methods. The role of modifiers in asymmetric hydrogenations is to enhance catalysis, with the bonding mode and geometry of adsorption being important, as well as the modifier concentration and the type and position of the substituent groups in the aromatic ring. Ultrasonic irradiation (sonication) is known to be  beneficial in catalytic asymmetric hydrogenations. Sonication removes catalyst surface impurities, and gives enhanced adsorption to the chiral modifiers. Now a team from Michigan Technological University, Houghton, U.S.A. (S. C. Mhadgut, I.Bucsi, M. Tà ¶rà ¶k and B. Tà ¶rà ¶k, Chem. Commun., 2004, (8), 984-985; DOI: 10.1039/b315244h) has revisited the Pd-catalysed, proline-modified, asymmetric hydrogenation of isophorone (3,3,5-trimethyl-2-cyclohexen-1-one (wit h a C=C bond)). They examined the catalyst, the modifier and the effects of sonication. Pd/Al2O3 was found to give a better, thoughlow, enantiomeric excess (ee) than Pd/C. Prolineand its derivatives (isomeric hydroxyl-prolines, prolinols and proline esters) were tested as chiral modifiers for Pd/Al2O3. Proline was the best modifier, and both enantiomers gave ee  £ 35%. Presonication was found to enhance the enantioselectivity when both the Pd/Al2O3 catalyst and the proline modifier were present. .Modifier-free. presonication and the presence of substrate during pretreatment decreased the enantioselectivity. The reaction was performed at 50 bar pressure and 25 °C. Presonication for 20 minutes gave the highest optical yields, and increased optical yields across all the H2 pressure range. Maximum ee occurred at a 1:2 isophorone:proline ratio, and with optimised conditions and presonication, the ee for the Pd/Al2O3-(S)-proline catalytic system was  £ 85%. Ultrasonic cleaning of the catalyst enhanced both the adsorption of the modifier and the modifier- induced surface restructuring of the Pd. The high ee was due to proline adsorption on the Pd surface. New catalysts that can strongly adsorb proline could thus become important in heterogeneous catalysis for C=C double bond hydrogenation of a,b-unsaturated carbonyl compounds.

Imagery in My Papa’s Waltz Essay examples -- My Papas Waltz Essays

Imagery in My Papa’s Waltz  Ã‚   Donald Hall describes the use of imagery in poetry as a device that "makes us more sensitive to [literature], as if we acquired eyes that could see through things"(p 530). Imagery creates vivid details that deal with one's sense of sight, sound, touch, smell, or taste. These details can be seen in Theodore Roethke's "My Papa's Waltz" because the senses of touch, sight, sound, and smell appeal to the reader in order to better explain the feelings of each character in the poem. Roethke's use of imagery creates a negative picture that is painted by the son of an abusive father. The poem "My Papa's Waltz" uses imagery by especially appealing to the sense of touch. The sense of touch also helps the reader to better understand the abusive father theme. The third stanza concentrates on the actual act of abuse. The author, Roethke, describes the battle wounds on the father and son that are inflicted by the father. The father's hand "was battered on one knuckle" from hitting his son with a belt (10). This is apparent because the son's "right ear scraped...