10 Tungsten Facts - W or Atomic Number 74

Tungsten (atomic number 74, element symbol W) is a steel-gray to silver-white metal, familiar to many people as the metal used in incandescent light bulb filaments. Its element symbol W derives from an old name for the element, wolfram. Here are 10 interesting facts about tungsten: Tungsten Facts Tungsten is element number 74 with atomic number 74 and atomic weight 183.84. It is one of the transition metals and has a valence of 2, 3, 4, 5, or 6. In compounds, the most common oxidation state is VI. Two crystal forms are common. The body-centered cubic structure is more stable, but another metastable cubic structure may coexist with this form.The existence of tungsten was suspected in 1781, when Carl Wilhelm Scheele and T.O. Bergman made previously unknown tungstic acid from a material now called scheelite. In 1783, the Spanish brothers Juan  Josà © and Fausto DElhuyar isolated tungsten from wolframite ore and were credited with discovery of the element.The element name wolfram came from the name of the ore, wolframite, which derives from the German wolfs rahm, which means wolfs foam. It got this name because European tin smelters noticed the presence of wolframite in tin ore reduced the tin yield, appearing to eat tin like a wolf would devour sheep. What many people do not know is that the Delhuyar brothers actually proposed the name volfram for the element, as w was not used in the Spanish language at that point.  The element was known as wolfram in most European countries, but called tungsten (from Swedish tung sten meaning heavy stone, referencing the heaviness of scheelite ore) in English. In 2005, the International Union of Pure and Applied Chemistry dropped the name wolfram entirely, to make the periodic table the same in all countries. This is probably one of the most highly disputed name changes made on the periodic table.Tungsten has the highest melting point of the metals (6191.6  °F or 3422  °C), lowest vapor pressure, and the highest tensile strength. Its density is comparable to that of gold and uranium and 1.7 times higher than that of lead. While the pure element may be drawn, extruded, cut, forged, and spun, any impurities make tungsten brittle and difficult to work.The element is conductive and resists corrosion, although metal specimens will develop a characteristic yellowish cast upon exposure to air. A rainbow oxide layer is also possible. It is the 4th hardest element, after carbon, boron, and chromium. Tungsten is susceptible to slight attack by acids, but resists alkali and oxygen.Tungsten is one of the five refractory metals. The other metals are niobium, molybdenum, tantalum, and rhenium. These elements are clustered near each other on the periodic table. Refractory metals are those which exhibit extremely high resistance to heat and wear.Tungsten is considered to have low toxicity and plays a biological role in organisms. This makes it the heaviest element used in biochemical reactions. Certain bacteria use tungsten in an enzyme that reduces carboxylic acids to aldehydes. In animals, tungsten interferes with copper and molybdenum metabolism, so it is considered slightly toxic.Natural tungsten consists of five stable isotopes. These isotopes actually do undergo radioactive decay, but the half-lives are so long (four quintillion years) that they are stable for all practical purposes. At least 30 artificial unstable isotopes have also been recognized.Tungsten has many uses. It is used for filaments in electric lamps, in television and electron tubes, in metal evaporators, for electrical contacts, as an x-ray target, for heating elements, and in numerous high temperature applications. Tungsten is a common element in alloys, including tool steels. Its hardness and high density also make it an excellent metal for constructing penetrating projectiles. Tungsten metal is used for glass-to-metal seals. The elements compounds are used for fluorescent lighting, tanning, lubricants, and paints. Tungsten compounds find use as catalysts.Sources of tungsten include the minerals wolframite, scheelite, ferberite, and huebnertie. Its believed about 75% of the worlds supply of the element is found in China, although other ore deposits are known in the US, South Korea, Russia, Bolivia, and Portu gal. The element is obtained by reducing tungsten oxide from the ore with either hydrogen or carbon. Producing the pure element is difficult, due to its high melting point.

Criminological Theories On The Crime Scene And Measure...

Criminological Theories YourFirstName YourLastName University title Criminological Theories Name (Institutional Affiliation) According to Sutherland Edward one of the many founding fathers of modern day criminology, we as learners are able to learn that criminology is a body of knowledge that regards crime as social phenomenon. In details, criminology entails processes such as breaking laws, making laws, and the reactions taken towards breaking of laws. When it comes to the study of criminology as a whole, it’s crucial to note that the discipline have gone ahead to adopt various methods of study which comes from varying behavioral and social sciences. Similar to other scientists, criminologists assess the crime scene and measure characteristics of crimes, victims, and criminals using various methods. The advantages associated with trying to understand why people commit crimes is that, criminologists are able develop ways to not only control crimes but also rehabilitate the criminals (Larry, 2014). To be precise, there are many theories used in criminology in order to unde rstand why people commit crimes. For instance among the key theories that we have include- Strain theory, Social disorganization theory, Rational choice theory, and finally Social learning theory. Generally by looking at Strain theory, we are able to understand that this theory which was coined in by an American sociologist, Merton Robert, states that culturesShow MoreRelatedExplain the Strengths and Weaknesses of One or More Criminological Theories for Explaining Crime in Contemporary Britain2651 Words   |  11 Pagesand weaknesses of one or more criminological theories for explaining crime in contemporary Britain Word count:1,200 Outline plan * Explain in brief the purpose of this essay. * Define the biological theory. * Evaluate Lombroso’s theory and link it to contemporary Britain. Include statistical data. * Discuss Charles Goring’s critisms of Lombroso’s theory. * Evaluate Sheldon’s somatypes theory. * Describe and evaluate the biological chromosomes theory. * State how Patria Jacobs’Read MoreCriminality: Criminology and Extra Y Chromosome3476 Words   |  14 Pagesdisproportionately favors criminal activity. It is based on the premise that the act or acts committed by an individual violates the natural rights that are given to the person by birth and or by right. The statement â€Å"Are criminals born, or made?† is wide reaching and still the subject of many debates. Each year when Crime in the United States is published, many entities—news media, tourism agencies, and other groups with an interest in crime in our Nation—use reported Crime Index figures to compileRead MoreJuvenile Delinquency And The Nature Of Police Juvenile9755 Words   |  40 Pagesstyle of the Publication Manual of the American Psychological Association, 6th edition. Avakame, Fyfe and McCoy (1999) who tested Black’s (1976) theory concluded that there are other extralegal factors besides law and police departmental policies that influence police response. According to them, the race, gender, wealth and education of the victims of a crime influence police decisions whether to intervene in a conflict, to arrest the suspects or to take other actions. This selective enforcement ofRead MoreThe Growing Problem of White Collar Crimes in India19963 Words   |  80 PagesThe Growing Problem of White Collar Crimes in India â€Å"The practitioners of evil, the hoarders, the profiteers, the black marketers and speculators are the worst enemies of our society. They have to be dealt with sternly, however well placed important and influential they may be; if we acquiesce in wrongdoing, people will lose faith in us†- Dr Radhakrishnan Methodology The research methodology used for the present research article is traditional Doctrinal

Academic Writing Free Essays

string(149) " the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience\." Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. We will write a custom essay sample on Academic Writing or any similar topic only for you Order Now Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. You read "Academic Writing" in category "Essay examples" Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on he delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monda y 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% Assessment Task: You are to write and deliver a speech (between 750 and 1000 words) on any subject and from any perspective. Note that you must not deliver the speech as yourself, but must write from the viewpoint of any person, real or imagined. This person may be from the past or future as well as the present. Marks will be awarded for the following criteria: Use of voice and body language Originality of concept and content Appropriateness of language for the subject and audience Vocabulary and grammar Please note that there will be no specific time limitations, but you are strongly encouraged to take your time when delivering the speech. Points on the delivery and writing of the speech will be covered in class on several occasions so there will be plenty of opportunities for guidance. Deadline date for submission:The speech is to be delivered during your normal tutorial during Weeks 8 and 9 (weeks beginning 15th and 22nd April 2013). The exact time and date will be agreed with your lecturer during previous weeks. A hard copy of the speech is to be submitted to Turnitin for assessment by midnight of Monday 15th April 2013. You are reminded that a limit of 15% plagiarism is permitted. Whilst the presentation mark will be given in class, if the plagiarism score is subsequently found to have exceeded 15% then the mark will be amended accordingly (this will mean a fail in the case of excessively high Turnitin scores). Format: Speech/presentation Word limit: 750-1000 words Learning outcomes to be examined in this assessment *Demonstrate an understanding of how language is used to promote certain purposes *Demonstrate an awareness of different writing styles and their effectiveness as a means of communication *Demonstrate presentation skills Assessment criteria Explanatory comments on the assessment criteria Maximum marks for each section Content, relevance, originality Choice of topic appropriate for subject matter and audience. Originality of topic. 30% Verbal and non-verbal communication. Clear diction and dramatic flair. Effective body language and engagement with audience. 35 % Linguistic styleImaginative and interesting use of language, as appropriate for the topic. 35% How to cite Academic Writing, Essay examples

Santana - Supernatural free essay sample

SantanasSupernatural was named Best Album of the Year bythe Grammy Awards committee. But the prestigious award doesnt tell thecold hard facts about the CD. Supernatural was not the best;it got the award because of its composer not itscontent. Supernatural is said to be Carlos Santanasbig comeback. It turned out to be a flop to anyone who actually heardit. The CD has one or two good songs, but even Smooth(featuring Rob Thomas) and Maria Maria get on listenersnerves after hearing them 10 times an hour on the radio. All thesongs are prefaced with the words listen to Carlos Santanaor played by Carlos Santana. We did buy the album knowingwhos on it; we dont need to hear Santanas name again andagain. Other great artists, including Eric Clapton, Lauryn Hilland Dave Matthews collaborated with him on this album, which may beanother reason it got such great reviews. We will write a custom essay sample on Santana Supernatural or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The truth is that thisCD is not very good. Most of the songs seem to be in jibberish since thelyrics are drowned out by Santanas guitar. We want to hear Santanasnew music, but we cant without thelyrics. Supernatural may have been Santanas comebackCD, but it wasnt much of one. He should go back to studio and rethinkthe album he really wants for his big comeback.