The Octet Rule Explanation in Chemistry

The Octet Rule Explanation in Chemistry The octet rule states that elements gain or lose electrons to attain an electron configuration of the nearest noble gas. Here is an explanation of how this works and why elements follow the octet rule. The Octet Rule Noble gases have complete outer electron shells, which make them very stable. Other elements also seek stability, which governs their reactivity and bonding behavior. Halogens are one electron away from filled energy levels, so they are very reactive. Chlorine, for example, has seven electrons in its outer electron shell. Chlorine readily bonds with other elements so that it can have a filled energy level, like argon; 328.8 kJ per mole of chlorine atoms are released when chlorine acquires a single electron. In contrast, energy would be required to add a second electron to a chlorine atom. From a thermodynamic standpoint, chlorine is most likely to participate in reactions where each atom gains a single electron. The other reactions are possible but less favorable. The octet rule is an informal measure of how favorable a chemical bond is between atoms. Why Elements Follow the Octet Rule Atoms follow the octet rule because they always seek the most stable electron configuration. Following the octet rule results in completely filled s- and p- orbitals in an atoms outermost energy level. Low atomic weight elements (the first 20 elements) are most likely to adhere to the octet rule. Lewis Electron Dot Diagrams Lewis electron dot diagrams may be drawn to help account for the electrons participating in a chemical bond between elements. A Lewis diagram counts the valence electrons. Electrons shared in a covalent bond are counted twice. For the octet rule, there should be eight electrons accounted for around each atom.

Slavery During American Revolution Essay Example | Topics and Well Written Essays - 750 words

Slavery During American Revolution - Essay Example The Arawaks also provided food, gifts and water to Christopher Columbus and his crew upon arrival in the territories of America. All these humane care and concern as displayed by Arawaks to Columbus and his group were senseless in ensuring continued peace and freedom among the communities of the Arawaks. These events as faced by Arawaks marked the sad the beginning of the slavery and American Revolution. Derived from the meek nature of the Arawaks, Columbus and his group developed mechanisms and ideas of converting innocent and peasant community into their slaves (Zinn 1). In the reports of Zinn (1), Columbus and his group were pleased with the good bodies of the Arawaks and the fact that they lacked dread weapons earned Columbus and his group much confidence to pursue and subdue the Arawaks in their own land. Zinn (1) connotes Columbus saying, â€Å"They have no iron. They got spears made of cane†¦they would make fine servants†. Columbus and his group had well wedged iro n weapons, which they even witnessed, cut one of the Arawaks when he received the weapon from the Columbus by holding the sharp edge. Columbus was also coined arguing that the ignorance of the Arawaks is the reason as to why the cut themselves with the iron. Columbus and his group on realizing that Baham island s were rich in precious gold, he resorted to engage forced slavery in the extraction process of the gold (Zinn 1). In order to enhance the power of his crew, Columbus travelled back to Italy with elements of gold to convince king to add him some other personalities to help him utilize the Arawaks in mining of the gold. Zinn (1) confirms that Columbus used his boosted force to compel the miserable Arawaks work in the mines and obtain him gold under slavery. Much work with insufficient food led to suffocation of the Arawaks thus leading to their death in large numbers. According to Zinn (1), Columbus also seized and enslaved a population of Indians in the Caribbean Island after he recognized that they were equally non-brutal. The enslaved Indians worked in the gold rich mines to excavate gold that were later transported to Europe. Many Indian however faced death due to their stubbornness to the Europeans. Those who could not work as slaves harmed and killed. Zinn (1) also confirms that Columbus picked 500 strong men among the Indian and Arawak communities to load gold into the ships and journey to Europe. Some of the slaves boarded on the ships in the reports of Zinn (1) died on the way to adverse cold weather in the ocean. Those who managed to reach Spain were sold as slaves to the rich households in Spain. Indians were forcibly compelled to gather gold in the depleted gold mines. Failure to collect sufficient amount called for mistreatment. Zinn (1) further reports that, the massive murder was directed to the Arawaks who tried to rebel against the Europeans. In addition, Indian and Arawaks under imprisonment faced merciless hanging by the Spaniard armie s (Zinn 1). In the views of Zinn (1), Pizarro one of the successors of Columbus conceded vehement killing of Indians whom he considered as scarifies to his gods. Indians would resist the domination of the Europeans to convert them into slaves. Indians’ resistance made Europeans to advance numerous attacks against the Indians, which included destruction of crops and death of people and animals. Zinn (2) reports that the white settlers in Virginia indulged in large

Comparing Texts Essay Example | Topics and Well Written Essays - 1250 words

Comparing Texts - Essay Example The ways in which language is employed to discover its subjective and illusionary nature is different when employed in poetry, plays or novels. Time and intended audience also become factors in how authors choose to explore this element of language. By comparing the use of language in Shakespeare's Sonnet 18 and Pirandello's Six Characters in Search of an Author -- both intended for mature, educated audiences -- to the more modern novel Harry Potter and the Philosopher's Stone by J.K. Rowling intended for a less mature, less educated audience, it is possible to see how truth is questioned through language. Shakespeare’s tone in Sonnet 18 is playful and ironic as he subtly pokes fun at the Romantic language that was then informing literature. He uses formalized constructions to build up an idealized sense of his female character consistent with the concepts considered important by the Romantics, â€Å"Shall I compare thee to a summer's day, / Thou art more lovely and more temp erate† (Shakespeare, 1969: 1456/1-2). However, he never actually tells his audience anything about this person. All the audience is permitted to know about her is that she exists, even if only in Shakespeare's mind. This levity within the very formalized, academic poetic world was out of step with his contemporaries. Despite the levity, Shakespeare used a very formalized style, informed by the newly introduced Italian sonnet style but with a twist. Shakespeare sticks to the 14 line structure and the iambic pentameter expected for a sonnet, but he follows his own rhyme scheme that blends more comfortably with the English language (Furniss & Bach, 2007: 579, 581, 593). This scheme follows an abab cdcd efef gg pattern. It gave him greater flexibility in matching the rhyme. Even then, he found it necessary to stretch the rhyme a bit, as in lines 9-12: â€Å"But thy eternal summer shall not fade, / Nor lose possession of that fair thou ow’st; / Nor shall death brag thou wan der’st in his shade, / When in eternal lines to time thou grow’st.† Combined with the relaxed approach taken by his tone, the formal structure of the poem makes it difficult for a modern audience to understand the joke. Through his use of language, Shakespeare brings his subject down from Romantic idealism to the everyday world of the common man. While Shakespeare mentions that â€Å"Sometimes too hot the eye of heaven shines, / And often is his gold complexion dimmed;† (5-6), giving the scene a sense of beauty, he keeps his subject on the level of the real by adding the twist of providing his readers with a description befitting just about any woman. Through tone, style and poetic devices such as imagery, Shakespeare manages to poke some fun at the traditional academic approach to poetry by bringing in more common language usage. Shakespeare’s woman, because of his tone, style and poetic devices, flashes in our minds as a woman of high quality, sub stance and perhaps even nobility, but still a living, breathing, human woman. In the same way that Shakespeare uses figurative language to both expose and hide his female subject, Pirandello uses meta-theatre to both expose and hide his characters in Six Characters in Search of an Author. From the beginning, it seems these characters are fully exposed to the audience. There are specific stage directions provided ensuring that the audience is aware there are no theatrical tricks being employed. Directions at the opening of Act I specify the stage should be "half dark, and empty, so that from the beginning the public may have the impression of an impromptu performance." The Characters begin to demonstrate their

Theodore Roethke, “My Papa’s Waltz” (999) Essay Example for Free

Theodore Roethke, â€Å"My Papa’s Waltz† (999) Essay Theodore Roethke (1948) My Papas Waltz The whiskey on your breath Could make a small boy dizzy; But I hung on like death: Such waltzing was not simple. We romped until the pans Slid from the kitchen shelf; My mothers countenance Could not unfrown itself. The hand that held my wrist Was battered on one knuckle; At every step you missed My right ear scraped a buckle. You beat time on my head With a palm caked hard by dirt, Then waltzed me off to bed Still clinging to your shirt. Summary A man recounts the childhood memories of his father coming home from work and dancing with him. They dance wildly; make a mess of the kitchen. Her mother does not approve. Next the father puts him to bed with the child tightly holding on to him. Paraphrase The smell of whisky on your mouth was strong enough to make a child like me giddy. However it did not stop me from keeping a tight grip on you as this type of rowdy dancing was not easy. We danced wildly till the utensils glide from the mantelpiece. My mother did not approve of our behavior and glared at us. The hand which supported my wrist had one knuckle tattered. Each time you put a wrong step, my right ear rubbed the hard surface of your belt. You hit me occasionally on my head with your palm which was covered with solid mud. Afterwards you dance me to my bed while I kept a firm hold on your shirt. Short Decision Part After reading the poem Theodore Roethke’s â€Å"My Papa’s Waltz†, for the second time I understood that the poem is a narration of the happy childhood memories of the author. The very title of the poem, â€Å"My Papa’s Waltz†, where the child mentions his father as ‘papa’ confirms the fact that the child has great affection for his father. The sentence ‘The whisky on your breath could mean that his father enjoys a drink before going to bed. The word ‘death’ means that the son enjoys but this rowdy dance is not easy so the son holds tightly to his father to avoid falling. When their wild dance made the kitchen untidy, his mother only frowned. Her silence shows that it is just a harmless dance between father and son. The sentence ‘You beat time on my head’ means that his father affectionately beat on his head with the rhythm of the dance.   I think that the last two lines, where the child tells that the father dancingly moved towards the his bed and put him to sleep, yet the child does not loosen his hold on his father’s shirt confirms that there is great and love and affection between the father and son. Reference Theodore Roethke, My Papas Waltz. 3 October 2007. http://gawow.com/roethke/poems/43.html

managerial accounting :: essays research papers

Management accounting is concerned with the provision and use of accounting information to managers within organizations, to facilitate the managers in their decision making and management control functions. Unlike financial accounting information (which, for the most part, is made publicly available), management accounting information is used within an organization and is usually confidential. (Jiambalvo) The distinction between traditional and innovative management accounting practices can be illustrated by reference to cost control techniques. Traditionally, management accountants’ principal cost control technique was variance analysis, which is a systematic approach to the comparison of the actual and budgeted costs of the raw materials and labor used during a production period. While some form of variance analysis is still used by most manufacturing firms, it nowadays tends to be used in conjunction with innovative techniques such as lifecycle costing and activity-based costing, which are designed with specific aspects of the modern business environment in mind. Lifecycle costing recognizes that managers’ ability to influence the cost of manufacturing a product is at its greatest when the product is still at the design stage of its product lifecycle (i.e., before the design has been finalised and production commenced), since small changes to the product design may le ad to significant savings in the cost of manufacturing the product. Activity-based costing recognizes that, in modern factories, most manufacturing costs are determined by the amount of ‘activities’ (e.g., the number of production runs per month, and the amount of production equipment idle time) and that the key to effective cost control is therefore optimizing the efficiency of these activities. Both lifecycle costing and activity-based costing recognize that, in the typical modern factory, the avoidance of disruptive events (such as machine breakdowns and quality control failures) is of far greater importance than (for example) reducing the costs of raw materials.

Linking Verbs

Who could forget the time when one needed a person to serve as a â€Å"bridge† to another person or to something? Also, people have relatives and they are connected by their immediate family members to these relatives. For example, a person is related or â€Å"linked† to his/her grandfather through his/her mother or father. Thus, the link is the parent for this instance. The same is true with verbs for there are the so-called â€Å"linking verbs.† These linking verbs are considered to be the part of the sentence or phrase which â€Å"implies state of being or condition for the subject, [and] not action† (â€Å"Linking Verbs†). To put it more clearly, the linking verb is included in a sentence to connect two different parts of the sentence. In addition to this, the linking verb tries to connect the subject to the parts of the sentence to which it is related (â€Å"Action Verbs and Linking Verbs†). In our previous example of relatives and families, an analogy may be made between the parents and the linking verbs for the two seek to connect two different things or persons. Examples of linking verbs include â€Å"am, is, are, was, were, has been, are being, might have, been, etc† which are forms of the verb â€Å"be,† â€Å"become,† and â€Å"seem† and all of these are considered to be always linking verbs in their sense (â€Å"The Linking Verb†). It is easy to identify the linking verbs for without these, there would be lesser thought to the sentence if none at all. Taking this statement as an example, â€Å"The blue sky is my source of inspiration in finishing my painting† would show that –is serves as the linking verb. It links the blue sky to the phrase â€Å"source of inspiration.† When one is given such sentence, it would be very easy to discern that it is the blue sky is the source of inspiration because of the inking verb. Imagine deleting the linking verb for the statement. It might give a general and vague idea that may be understood by some but can not entirely be discerned. The linking verb may be used for three instances, which is to link the subject with a noun, a pronoun, or an adjective (â€Å"Linking Verbs†). An example of a linking verb that connects the subject with a noun is â€Å"Ana is a queen of her own dreams.† Could you identify the subject and the noun? Indeed, Ana is the subject and the word queen is the noun to which the subject, Ana, is connected. Going to the next, which is connecting the subject to a pronoun, a statement that could be used as an example would be â€Å"The big mansion down the road is his.† In that statement, the big mansion is connected to the pronoun â€Å"his† and this shows that the big mansion is owned by the man referred to in the statement. Lastly, the linking verb is used to connect the subject to the adjective which it is related to. For example, â€Å"The steps she made towards the aisle were as graceful as ever.† The subject here is the word â€Å"steps† and the linking verb is â€Å"were† and this is connected to the adjective â€Å"graceful.† Aside from discussing the purpose of the linking verb, it is also important to take note of when the action occurred to be able to place the correct linking verb. Linking verbs are important in constructing sentences with thought. In one whole page of words, it could be seen that linking verbs play an important role in weaving the ideas together and to show the relationships between the two. Never forsake the usefulness of the linking verb for, though it may only be a few words, it surely makes the difference for the whole thought. Works Cited The Linking Verb. Robin L. Simmons. 23 March 2008 [http://www.chompchomp.com/terms/linkingverb.htm]. Action Verbs and Linking Verbs. 28 April 2002. Gallaudet University, Washington, DC. 23 March 2008 [http://depts.gallaudet.edu/englishworks/grammar/actionlinking.htm]. Linking Verbs. Keelee Weinhold. 23 March 2008 [http://grammar.uoregon.edu/verbs/linking.html].

Why We Need Act On Gun Control - 1646 Words

Why We Need to Act on Gun Control On July 20th, 2012, at the screening of the film The Dark knight Rise, a armed man walked into the theater and shot at the audience with multiple weapon, which caused the result of 12 people died, 70 others injured; On January 8th, 2011, a 22 years old young man assaulted the American senator Gabrielle Giffords and other 18 people with a pistol. As a result, six bystanders died including a girl only 9 years old; On April 16th, 2007, a student in Virginia took away 32 people’s life (including himself) with two pistols (Global Shooting). As can be seen, these are massacres happened within last 5 years, and obviously, these tragedies are all indicate a issue need to be discussed: gun control. Gun control†¦show more content†¦According to conservative radio host Alex Jones: â€Å"America was born on guns and whiskey.† In spite of this might be true, however, the primitive, unenlightened culture should always be forbidden with the p ace of time. Once before, slavery was a part of American culture. The slaves irrigated the soil with their sweat, built the railway around the country with their hands and grew the crop which raised American. In other words, America was born on slavery. In this case, the president Abraham Lincoln abolished the slavery in 1867; There was an age which is that dictators rule the world. However, people kicked the dictators out of history stage, we prefer democracy instead; Within a hundred years ago, women were considered lower status than man. Sexism was global wide. In reality, we treat gender with bias no longer now. All these tradition which were considered â€Å"cultures† are no longer exist. Do we really need to reserve the deadly weapon like gun as a part of our culture? Also, another factor that opposes the gun control in the US is the second amendment in the constitution. The purpose of second amendment was to prevent the tyrant government and invaders. According to Noah Webster, a Federalist, â€Å"The supreme power in America cannot enforce unjust laws by the sword; because the whole body of people are armed