Examples of Polar and Nonpolar Molecules

Examples of Polar and Nonpolar Molecules The two main classes of molecules are polar molecules and nonpolar molecules. Some molecules are clearly polar or nonpolar, while many have some polarity and fall somewhere in between. Heres a look at what polar and nonpolar mean, how to predict whether a molecule will be one or the other, and examples of representative compounds. Key Takeaways: Polar and Nonpolar In chemistry, polarity refers to the distribution of electric charge around atoms, chemical groups, or molecules.Polar molecules occur when there is an electronegativity difference between the bonded atoms.Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out. Polar Molecules Polar molecules occur when two atoms do not share electrons equally in a covalent bond. A dipole forms, with part of the molecule carrying a slight positive charge and the other part carrying a slight negative charge. This happens when there is a difference between the electronegativity of each atom. An extreme difference forms an ionic bond, while a lesser difference forms a polar covalent bond. Fortunately, you can look up electronegativity on a table to predict whether or not atoms are likely to form polar covalent bonds. If the electronegativity difference between the two atoms is between 0.5 and 2.0, the atoms form a polar covalent bond. If the electronegativity difference between the atoms is greater than 2.0, the bond is ionic. Ionic compounds are extremely polar molecules. Examples of polar molecules include: Water - H2OAmmonia - NH3Sulfur dioxide - SO2Hydrogen sulfide - H2SEthanol - C2H6O Note ionic compounds, such as sodium chloride (NaCl), are polar. However, most of the time when people talk about polar molecules they mean polar covalent molecules and not all types of compounds with polarity! Nonpolar Molecules When molecules share electrons equally in a covalent bond there is no net electrical charge across the molecule. In a nonpolar covalent bond, the electrons are evenly distributed. You can predict nonpolar molecules will form when atoms have the same or similar electronegativity. In general, if the electronegativity difference between two atoms is less than 0.5, the bond is considered nonpolar, even though the only truly nonpolar molecules are those formed with identical atoms. Nonpolar molecules also form when atoms sharing a polar bond arrange such that the electric charges cancel each other out. Examples of nonpolar molecules include: Any of the noble gasses: He, Ne, Ar, Kr, Xe (These are atoms, not technically molecules.)Any of the homonuclear diatomic elements: H2, N2, O2, Cl2 (These are truly nonpolar molecules.)Carbon dioxide - CO2Benzene - C6H6Carbon tetrachloride - CCl4Methane - CH4Ethylene - C2H4Hydrocarbon liquids, such as gasoline and tolueneMost organic molecules Polarity and Mixing Solutions If you know the polarity of molecules, you can predict whether or not they will mix together to form chemical solutions. The general rule is that like dissolves like, which means polar molecules will dissolve into other polar liquids and nonpolar molecules will dissolve into nonpolar liquids. This is why oil and water dont mix: oil is nonpolar while water is polar. Its helpful to know which compounds are intermediate between polar and nonpolar because you can use them as an intermediate to dissolve a chemical into one it wouldnt mix with otherwise. For example, if you want to mix an ionic compound or polar compound in an organic solvent, you may be able to dissolve it in ethanol (polar, but not by a lot). Then, you can dissolve the ethanol solution into an organic solvent, such as xylene. Sources Ingold, C. K.; Ingold, E. H. (1926). The Nature of the Alternating Effect in Carbon Chains. Part V. A Discussion of Aromatic Substitution with Special Reference to Respective Roles of Polar and Nonpolar Dissociation; and a Further Study of the Relative Directive Efficiencies of Oxygen and Nitrogen. J. Chem. Soc.: 1310–1328. doi:10.1039/jr9262901310Pauling, L. (1960). The Nature of the Chemical Bond (3rd ed.). Oxford University Press. pp. 98–100. ISBN 0801403332.Ziaei-Moayyed, Maryam; Goodman, Edward; Williams, Peter (November 1,2000). Electrical Deflection of Polar Liquid Streams: A Misunderstood Demonstration. Journal of Chemical Education. 77 (11): 1520. doi:10.1021/ed077p1520

Adaption vs. Adaptation

Adaption vs. Adaptation Adaption vs. Adaptation Adaption vs. Adaptation By Maeve Maddox A reader in the UK who grew up hearing the word adaption used in reference to radio and television programs based on books wonders, Where did adaptation come from, since there is no verb adaptate? The earliest OED documentation of the verb adapt is dated 1531. The noun adaptation comes along in 1597, 18 years earlier than adaption (1615). English has no verb â€Å"adaptate,† but the past participle stem of Latin adaptare (to fit, to adapt) is adaptat-. Adaptation came into English from French, with the extra syllable already in place. Adaption looks like a homegrown nominalization of the verb adapt. The Google Ngram Viewer, which tracks the incidence of words in printed sources from 1800 to 2000, shows adaption running a distant second to adaptation during the entire period. The OED has a brief entry for adaption, prefaced by the notation â€Å"Now nonstandard.† Clearly, adaptation is the standard form of the word meaning, â€Å"an altered or amended version of a text, musical composition, etc., especially one adapted for filming, broadcasting, or production on the stage from a novel or similar literary source.† But although adaptation is the preferred spelling, adaption is in use among English speakers in Canada, Australia, the UK, and the US: The Snow Queen: A Pop-Up Adaption of a Classic Fairytale  Hardcover  Ã¢â‚¬â€œPublication date: 2013. Movie Adaption > Popular Movie Adaption Books –categories on Goodreads Why book-to-film adaption soundtracks need to fit with the original book –headline, The Guardian Lake Bell to Direct Film Adaption of  The Emperor’s Children –headline, Time.com The Broadway musical  West Side Story  is an adaption of  Romeo and Juliet.  Ã¢â‚¬â€œarticle, The Globe and Mail (Canada) On a page at the BBC News site, adaption occurs in a header, but adaptation is used in the text below it. Bottom line: Some writers in the English-speaking world continue to use adaption as an alternative spelling of adaptation, but adaptation is the preferred standard form. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Misused Words category, check our popular posts, or choose a related post below:10 Rules for Writing Numbers and Numerals40 Synonyms for â€Å"Different†Appropriate vs. Apropos vs. Apt

Victims of Terrorism, Hate Crimes & Racial Profiling Assignment

Victims of Terrorism, Hate Crimes & Racial Profiling - Assignment Example However, there have been attempts to end racial profiling in the United States. Question one: Terrorism is a systematic use of terror, especially as a means of coercion. Domestic terrorism refers to illegal use of force or violence committed by a person or group against a person to intimidate them for political or social objectives. The US considers terrorist attacks domestic if they are carried out by its citizens who are not acting on behalf of a foreign power (Doerner, 2012). Investigations of domestic violence are carried out in accordance with The Attorney General guidelines on general crimes and Domestic Terrorism Investigations. The establishment of terrorism as a crime that can be committed domestically became a law in the year 2001 when President George W. Bush signed the Patriot Act. Domestic terrorism is a major concern in the United States. In fact, domestic terrorism has currently hit the highest point of the cycle in the United States but most of the cases are simple at tacks committed by lone actors. However, the implications of the crimes is as those of jihadist and Iranian attacks (Peek, 2011). Recently there was an attack on Oak Creek, which was termed as a case of domestic terrorism where seven people were shot and killed. The US local law enforcement agencies have played a key role in dealing with the many threats of the modern world. The police in the United States are involved in mitigating and defeating terrorism in the United States. This is because the police agencies have acquired technology and ideas on how to offer effective defense and conquer offence. According to Peek (2011), they work with communities in order to achieve this goal. Therefore, the establishment of terrorism as a crime that can be committed domestically has changed policing in a number of ways. It has broadened the ideas and knowledge of the Department of Homeland Security who work together with police, intelligence and immigration agencies to fight terrorism (Doern er, 2012). Question One A: Policing in the US has changed with the establishment of terrorism as a crime that can be committed domestically. As mentioned above, police play a major role in mitigating and overcoming terrorism in the United States. Local agencies in the country have the knowledge and technology to create counter networks and to work on effective defenses and offenses. This has been possible due to expansion on knowledge concerning the concept of terrorism and what entails it. Through multijurisdictional efforts, police can determine whether individuals or enterprises are an active threat that calls for inquiry or enforcement action (Peek, 2011). The agencies are transparent, flexible and adaptable enough to join forces with one another. They develop more important and credulous unions and create strategies that capitalize on law enforcement resources. Most significantly, they work with societies to counter the acts of terrorism. Policing is therefore a convergent tact ic that battles crime and disorder while creating unfriendly environments for terrorists. For instance, after terrorist events in 2011, police organizations have strengthened their efforts against terrorism (Peek, 2011). The Justice Departments’ federal Bureau of Investigations which is the leading agency dealing with matters of terrorism and the Department of Homeland Security and the local agencies have strongly been involved in the fight against terrorism. The police have been able to attack

Physical Inactivity Research Paper Example | Topics and Well Written Essays - 750 words

Physical Inactivity - Research Paper Example This paper reviews the literature available to know more about various consequences of childhood physical inactivity. Millar and Dean (2012), pointed out that â€Å"Obesity is the most significant risk factor for the development of type 2 diabetes in childhood. The main causes of obesity and diabetes in the developed and the developing world include a lack of adequate physical activity (Millar and Dean, 2012). The intrusion of internet, computers and mobile phones, forced children to shift their attention from painful physical activities to less painful mental activities. From the above data, it is evident that girls are undergoing severe harassments both in the family and in other social circles because of overweight. Such harassments can affect the development of self-esteem among children. â€Å"According to the WHO, the regional differences in overweight and obesity could be explained by a number of factors including differences in socioeconomic status and the availability and preferences of food and leisure-time physical activities† (Malkogeorgos, 2010, p.137). Different countries have different overweight statistics among teenage community. This is because of the differences in life styles and eating habits in different countries. It should be noted that underweight is the problem among children in some of the poor African countries whereas in American and European countries children are suffered because of overweight. It is evident from the figure that only 7% of the available 39% of other than classroom hours is used for physical workouts. TV watching and reading take 26% of the available 39% of leisure time. All these facts clearly show that modern children are using negligible time for physical workouts and the percentage of physical inactivity time is more than the desired level. Adegoke and Oyeyemi (2011) mentioned the consequences associated with physical inactivity. In their opinion, â€Å"Physical inactivity is

The Same Story Essay Example for Free

The Same Story Essay Write A Detailed Comparison On The Way Of How A Tabloid Newspaper (The Sun) And A Broadsheet Newspaper (The Times) Treat The Same Story. The purpose of this essay is to write a detailed comparison based on the ways of how different newspapers present their data in order to attract custom. I will be looking closely at the presentation, content and style of a tabloid newspaper (The Sun) and a broadsheet newspaper (The Times). To enable this assessment to be fair, I will be concentrating on a particular event, which happened back in 1986. The article in which I will be focusing on is about an Arab man (Nezar Hindawi) who tried to dupe his pregnant girlfriend. The Arab had planted an explosive in the luggage belonging to his intended wife and sent her as a human time bomb to board a jet containing more than four hundred unsuspecting passengers and crew. Newspaper articles always consists of a subject heading; to attract a reader to a story, subheadings; to guide the reader through the story, and paragraph sections which contain necessary details appropriate for the clarification of the story for the reader it targets. The language and visual appearance are the key factors to the contents of a newspaper, and the editors pride themselves on a politically correct informative style of journalism, suitable for the newspaper they are promoting. The visual appearance is a very important aspect of both a tabloid and a broadsheet newspaper layout, as it has to capture the publics eye. If it fails to do this, there will be a decline in public interests and sales would decrease through loss of custom. The standards of the newspaper should be of the same quality each time it comes off the press, otherwise the public turn towards other companies. The consistency of this standard is vital to the consumer who expects a particular style. Newspaper companies often run the beginning of the story on the front page and continue it on a later page. The importance of the story is usually included in the information given on the front page. The story about the human time bomb hit the front pages of the Sun and The Times. The two companies displayed the story in extremely different ways. The Sun used most of the space on the front page for this article. The size of a tabloid newspaper is suitable to fit into small places, and it does not create the problem of folding over when being read, like a broadsheet does. The only other information featured on the page was an advertisement for the Sam Frocks Collection and another for the i 50,000 Bingo prize for that days winner. The journalists managed to fill it with a big, bold WANTED sign stretching from one side of the page to the other as well as a quarter page black and white picture of the Arab, and a twenty-one worded headline placed just above the tiny amount of text that was squashed into the bottom corner. To make the headline eyecatching the W. O. B technique was used. W. O. B is an abbreviation for White On Black. This is effective because it darkens the space around the writing enabling the words to make a dramatic appearance. This technique was used in three different places throughout the front page. It is used in the papers name appearance, the advert featured and the headline of the Arab story. In comparison, The Times displayed many of their articles on the front page. The Times is able to provide more detailed stories, as it is longer and wider than The Sun. Broadsheets are often carried under the arm, as they are too big to store in a handbag or suitcase. The Arab rat article was placed at the top of the page in a tiny space. The other information included on the page is an advertisement for Swindon Enterprise, a cartoon caption and articles such as England Down And Out, Pledge On Terror Even At Cost Of Life, Thousands Seek To Flee Tripoli. Within the space provided for this story the editor inserted a small picture of the Arab, with a caption just beneath it, a headline, a sub headline, and the text. The picture in The Times used for the article was the same picture as the editor of the Sun had used. The only difference between the two photographs is the size.

Back Where I Come From Essay -- Kenny Chesney Music Essays

Back Where I Come From Where someone is born and raised holds a special place in their heart. In the song, â€Å"Back Where I Come From,† written by Kenny Chesney, he speaks from his heart about his hometown and attempts to share those feelings with his audience. He sings about specific experiences growing up, and this is his way of reflecting what the feeling of home means to him. The structure in which he has written this piece focuses a lot of attention on the author himself. His informality invites the audience to share his experiences with him. Chesney appeals to emotion through his anecdotes and creates an impression on the audience. Through the analysis of this song it is easy to identify the type of rhetorical appeal Kenny Chesney presents to his audience. Kenny Chesney was born and raised in the tiny town of Luttrell, Tennessee. He played high school football and attended college. â€Å"Anyone who is passionate about music is emotional,†(â€Å"Kenny Chesney†) comments Chesney. Since he was young he had a dream to do what he loves most, and that is to sing. Kenny Chesney has become famous by singing about his own life, which is particularly apparent in the song, â€Å"Back Where I Come From.† Ultimately, it seems that he wants his audience to feel what he feels and be where he has been. â€Å"My audience is smart. They are real people who lead whole lives,†(â€Å"Kenny Chesney†) explains Chesney. He believes his audience to be, in essence, like himself: those who feel the deeper meanings of life. When explaining the audience of a performer, it could be as straightforward as the people who fill music venues around the world to hear his music. In this case, it is more than that. It is the people who hear his music and don’t shrug it off as typ... ...ics. A successful musical artist appeals to these rhetorical ideas to keep the interest growing for more of the same type of music. The song, â€Å"Back Where I Come From† tells a lot about its author, Kenny Chesney. Lyrically, the song can relate to so any people on so many levels and appeals to its audience through emotion. The structure he uses affects the music he makes. There are so many ways of expressing feelings and emotions. Music seems to be one of the strongest ways of conveying deep thought and emotion, because without the added beat or tune, music is just words. Some audiences can relate just as well to written text, but Chesney’s audience loves him for his musical purpose and talents. He writes with his heart for people like him that can relate to his experiences or live with him his dreams. Kenny Chesney is a lover, a writer, a singer, and an inspirer.

Exclusionary Rule Essay

The Fourth amendment guards against unreasonable searches and seizures, along with requiring any warrant to be judicially sanctioned and supported by probable cause. The interpretation and execution of the Fourth amendment in the courtroom however, is decided by the Supreme Court in an attempt to find a fair balance between individual and community interests. The exclusionary rule for example, is a Supreme Court precedent that holds police departments responsible for seizing incriminating information according to constitutional specifications of due process, or the information will not be allowed as evidence in a criminal trial. The question that arises in turn, is whether the exclusionary rule has handcuffed the abilities to effectively protect the community by the police, or if it has actually resulted in a positive police reform which needs to be expanded upon. My opinion is that although the exclusionary rule may significantly slow down the police department’s investigation and arrest process, it is a necessary â€Å"evil† in order to protect the rights of the individuals who in fact should not have their homes searched. I do however, agree that without the restrictions of the exclusionary rule police departments would be able to do their job a lot faster and more effectively, without having to worry about first getting a search warrant or after getting â€Å"slam dunk† evidence, having to see a case thrown out because it was not obtained through due process. My personal concern for allowing the police such a high level of discretion though, is that in the heat of the investigation and desire to catch or lock away a suspect, police may search the homes of people related, associated, or even suspected of having connections to the suspect in order to get information that could result in a guilty verdict, which would pote ntially violate the privacy of people who potentially are not connected to the crime or suspect being investigated. If I was personally appointed by the President of The United States to serve in the Supreme Court for example, I would take a close look at the case of Mapp v. Ohio. In Mapp v Ohio the Cleveland Police Department forcibly entered the home of Dollree Mapp without a warrant in search of a wanted fugitive. The Cleveland Police failed to find a fugitive, but instead found a trunk full of obscene material which under Ohio law was illegal. When the case went to court Mapp was initially convicted, through a series of appeals that eventually made it to the U.S. Supreme Court however, the conviction was overturned. As an appointed Supreme Court Justice, I would have absolutely done the same thing in overturning the decision on Mapps case. The reason for my vote or decision, would be that the police did not only forcibly enter the defendants home without a warrant, but they lied about having a warrant, and arrested her for a crime completely unrelated to what they were looking for if they had a warrant. Even if the Police department had a warrant to search Mapp’s home for a fugitive, my first question would be what size the trunk was. If the trunk was a small one in turn, I would question why the Police opened it if the fugitive could not possibly be hiding inside the trunk. I believe that the actions of the Cleveland Police Department were abusive, deceptive, and overall destructive for the reputation of their police department, their complete disregard for due process if overlooked, could have possibly encouraged other police departments around the country to take similar approaches to investigations without consequence. I am confident in the decision made by the U.S. Supreme Court and would not change it at all if I were appointed as a Supreme Court Justice myself.