20 Facts About the Chemical Element Silver

20 Facts About the Chemical Element Silver Silver is a precious metal that has been known since ancient time. This is a list of interesting facts about the element silver. 1. The word silver comes from the  Anglo-Saxon word  seolfor.  There is no word that rhymes with the English word silver. It is a transition metal element, with symbol Ag, atomic number 47, and atomic weight of 107.8682. 2. Silver is exceptionally shiny! It is the most reflective element, which makes it useful in mirrors, telescopes, microscopes and solar cells. Polished silver reflects 95% of the visible light spectrum. However, silver is a poor reflector of ultraviolet light. Stocktrek Images/Getty Images 3. Silver can exist in its native state. In other words, nuggets or crystals of pure silver exist in nature. Silver also occurs as a natural alloy with gold that is called electrum. Silver commonly occurs in copper, lead, and zinc ores. 4. Silver metal is not toxic to humans. In fact, it can be used as a food decoration. However, most silver salts are toxic. Silver is germicidal, meaning it kills bacteria and other lower organisms. 5. Silver is the best electric conductor of the elements. It is used as the standard by which other conductors are measured. On a scale of  0 to 100, silver ranks 100 in terms of electrical conductivity. Copper ranks 97 and gold ranks 76. 6. Silver has been known since antiquity. It was one of the first five metals to be discovered. Mankind learned to separate silver from lead back in 3000 BC. Silver  objects have been found dating back before 4000 BC. It is believed the element was discovered around 5000 BC. Early Saxon coins, 5th-6th century. Silver pennies known as sceattas, found in excavations in London area.   Heritage Spanish/Getty Images 7. Only gold is more ductile than silver. An ounce of silver can be drawn into a wire 8,000 feet long. 8. The most commonly encountered form of silver is sterling silver. Sterling silver consists of 92.5% silver, with the balance consists of other metals, usually copper. 9. The chemical symbol for silver, Ag, comes from the  Latin word for silver, argentum, which in turn derives from the Sanskit word  argunas, which mean shining. 10. A single grain of silver (~65 mg) can be pressed into a sheet 150 times thinner than the average sheet of paper. 11. Silver is the best thermal conductor of any metal. The lines you see in the rear window of a car consist of silver, used to defrost ice in the winter. 12. The words for silver and money are the same in fourteen languages or more. 13. The primary source of silver today is the New World. Mexico is the leading producer, followed by Peru. The United States, Canada, Russia, and Australia also produce silver.  Around two-thirds of the silver obtained today is a by-product of copper, lead, and zinc mining. Silver mines in Mexico, such as this now-abandoned one, provided Spain, in the 18th century, with over one third of the silver sent out of the New World.   Danny Lehman/Getty Images 14. Coins minted in the United States prior to 1965 consists of about 90% silver. Kennedy half dollars  minted in the United States  between 1965 to 1969 contained 40% silver.   15. The compound silver iodide has been used for cloud seeding, to cause clouds to produce rain and try to control hurricanes. 16. The price of silver presently is less than that of gold, varying according to demand, discovery of sources and the invention of methods of separating the metal from other elements. In ancient Egypt and Medieval European countries, silver was valued more highly than gold. 17. Some silver compounds are highly explosive. Examples include silver fulminate, silver azide, silver(II) oxide, silver amide, silver acetylide, and silver oxalate. These are compounds in which silver forms a bond with nitrogen or oxygen. Although heat, drying, or pressure often ignite these compounds, sometimes all it takes is exposure to light. They may even explode spontaneously. 18. Silvers atomic number is 47, with an atomic weight of 107.8682. 19. Silver is stable in oxygen and water, but it  tarnishes in air because of a reaction with sulfur compounds to form a black sulfide layer. 20. Uses of silver metal include currency, silverware, jewelry, and dentistry. Its antimicrobial properties make it useful for air conditioning and water filtration. It is used to make mirror coatings, for solar energy applications, in electronics, and for photography. Sources Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.Hammond, C. R. (2004). The Elements, in Handbook of Chemistry and Physics (81st ed.). CRC press. ISBN 978-0-8493-0485-9.Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

Modal and Phraseological Verbs in Italian

Modal and Phraseological Verbs in Italian In addition to the Italian auxiliary verbs essere and avere, Italian modal  and phraseological verbs also serve as support to other verbs. Italian phraseological verbs (verbi fraseologici)  include   stare,  cominciare,  iniziare,  continuare,  seguitare,  finire, and  smettere,  which, when used before another verb (mostly in the  infinitive, but also as a  gerund), define a particular verbal aspect. Read on to learn more about these important Italian helping verbs. Modal Verbs The Italian modal verbs are dovere, potere, volere- meaning, respectively: necessity, possibility, and volition- they precede the infinitive of another verb and indicate a mode, such as in the following examples. The sentences show how to use these three verbs in Italian, followed by the type of mode in parentheses, followed by the English translation: Sono dovuto tornare (necessit)- I had to come back (need).Non ho potuto aiutarlo (possibilit).- I could not help him (possibility).Rita vuole dormire (volont).- Rita wants to sleep (will). To underscore the close link between the modal verb and the verb that follows it, the former usually takes the auxiliary of the second: Sono tornato. / Sono dovuto (potuto, voluto) tornare.Ho aiutato. / Ho potuto (dovuto, voluto) aiutare. This translates in English to: Im back. / I had to (have, wanted to) return.  I helped. / I have (had, wanted to) help.. It is common to encounter modal verbs with the auxiliary avere, even when the governing verb requires the auxiliary essere, as in: Sono tornato. / Ho dovuto (potuto, voluto) tornare.- Im back. / I had to (have, wanted to) return. Modal Verbs Followed by Essere In particular, the modal verbs take the auxiliary verb avere when they are followed by the verb essere: Ho dovuto (potuto, voluto) essere magnanimo.- I had to (have, wanted) to be magnanimous. The presence of an unstressed pronoun, which can be placed before or after the servile verb, has an effect on the choice of the auxiliary verb, such as: Non ho potuto andarci.  Non sono potuto andarci.Non ci sono potuto andare. Non ci ho potuto andare. This transelates in English to: I could not go there. I am not able to go there.  I could not go there. I could not go there. In addition to dovere, potere, and volere, other verbs such as sapere (in the sense of being able to), preferire, osare, and desiderare can also support the infinitive forms: So parlare inglese. Preferirei andarci da solo.Non osa chiedertelo. Desideravamo tornare a casa. In English, this translates to: I can speak English. Id rather go alone.  Do not dare ask. We wanted to go home. Phraseological Verbs To understand phraseological verbs, its helpful to view how they are used in context, in brief prases. Each of the following phases in Italian uses a phraseological verb, followed by the type of action being described, followed by the translation of the phrase and type of action in English: Sto parlando (azione durativa) - Im talking about  (action durative)So per parlare (azione ingressiva)- I know from talking  (ingressive action)Cominciai a parlare (inizio dellazione)- began to talk  (onset of action)Continuai a parlare (proseguimento dellazione)- continued to talk  (continuation of)Smisi di parlare (fine dellazione)- I stopped talking  (end of action) Additionally, various phrases and expressions are used idiomatically in Italian: essere sul punto di, andare avanti, a etc.- be about to,  go ahead, and  etc.

Unit 6 Case Management Seminar Research Paper Example | Topics and Well Written Essays - 250 words

Unit 6 Case Management Seminar - Research Paper Example 279), which may be performed by Case Managers. Thus, it is imperative for Case Managers to know how to complete a provisional DSM Diagnosis. A social history is an accurate account of the client’s family and societal background, educational level, whether special assistance was required in the past, information regarding alcohol or drug abuse or any legal problems associated with the client. The Mental Status Examination (MSE) forms an integral part of the social history, capturing subtle visual and verbal attributes of the client. It involves observations based on our client’s general appearance, cognitive functioning, behavior intelligence, thought process and content, reality testing, affect, suicidal or homicidal ideation, impulse control, judgment and insight. As described in the text, it is useful in Case management by helping clinicians understand what has been going on with the client between sessions and to determine the best course to follow with each individual† (Ch. 18, p. 314). Case Managers are required to assess the client’s environment in order to understand their specific needs and goals. Our author mentions, â€Å"Sometimes you will be asked to go to someone’s home to do an assessment or to do an interview. People’s surroundings often hold clues to the way they are currently structuring their lives.† (Ch. 18, p.313). Case Managers need to carefully assess the appropriateness of the surroundings after proper inquiry, to order to judge the client’s needs. Importantly, Case managers must look at the way the person keeps his home. Our author rightly adds that â€Å"this tells something about the person’s capacity to attend to the routine details of living, or it may indicate a debilitating mental illness, such as hoarding† (Ch. 18, p.313). Thus, an ecological perspective helps understand the client’s needs and accordingly define

Industrialization in the USA during the 19th century Essay

Industrialization in the USA during the 19th century - Essay Example This trade led to a surplus of raw materials into the United States causing the need to industrialize the manufacturing industries so that they could meet the external demand for their products. In addition, industrialization took place due to migration of large populations from England to the USA, which marked an influx of labor forces to work on the different sectors in USA. This was then coupled with rural-urban migration of the American population leading to creation of urban settlements that were well planned (Hirschman & Mogford, 2009). Consequently, the skilled and semi-skilled population took to commerce and other urban economic activities, which further saw industrialization take root in the USA. Advancements in transport and technology also saw industrialization take place due to the ability to move bulky goods within a shorter period in the case of transport. In regard to technology, mechanization of certain aspects of production saw industrialization take place due to the ease of manufacturing and processing of certain goods. Altogether, technology and trade were the most significant factors responsible for the industrialization of the USA during the 19th century because trade brought demand and technology eased production. Wizard of Oz The wizard of Oz goes as far as to present numerous angles to which the story of the Wizard of Oz can be translated and even understood by looking at it through different literary forms.

Learning and education Essay Example for Free

Learning and education Essay Learning and education are some of the most prized assets any person could have. Many parents consider these assets to be the primary treasure which they can give to their children to face the challenges of the future. However, there are some instances in which education becomes unreachable due to some hindrances like learning disabilities. It may become a concern not only for the individual but for the family as well.   Fortunately there are still some available steps in order to combat the possible dilemmas learning disabilities might bring.   Ã‚  Ã‚  Ã‚   On the part of Tony, it seems that he is not really that ready enough to become a part of the larger scope of education structure. He used to have a separated domain of learning which highlighted his interests to accommodate knowledge. The one-on-one teaching method provided by Ms. Brumbley became the most comfortable realm for Tony to achieve success. However, in order to develop more, he needs to take a few more steps of the education ladder. In middle school and beyond, school works are more complex and require more diligence in following directions. Add to that the extremely dynamic social nature of the class where students will tend to stabilize their roles and projections towards other members of the society. Because of such factors, Tony may have a hard time adjusting to the situation.   Ã‚  Ã‚  Ã‚   In order to accommodate Tony to perform his ultimate best, what can be done is to at least set some modifications in the classroom. First is to introduce the basic foundations of new lessons for discussion. For example, a lesson in Math can first take a course of simple arithmetic to fraction computations. This may seem too easy relative for the whole class but exampling to them the importance of the strong math foundation will not impose an obvious aspect that the procedure is intended for Tony to refresh what he has previously learned. It is also possible to provide Tony a separate customized textbook and assignments so that he can gradually adjust to the lessons involved in middle school education. This approach is not intended for a long term basis so that he can actually progress to entertain newer and more complex lessons in middle school subjects. Lastly, as a concerned teacher, he will be provided with at least an hour of academic assistance everyday after class. A consultation form of conversation is best for him so that he could provide any feedback about the class procedures.   Ã‚  Ã‚  Ã‚   In order to support the standing of Tony in middle school through high school, coordinating with his other teachers would be the best practice to do. This will help the whole learning sector to have a single approach in fulfilling the special needs of Tony. Even if after he has completed the year level in a particular class, a complete coordination between his previous teachers and the ones who will be handling him should be initiated.   Ã‚  Ã‚  Ã‚   Basing on some studies and personal observations, individuals like Tony do not simply experience learning problems. The nearest dilemma apart from education concerns is the social interaction aspect of the person. Primarily, if one is not able to acquire the supposedly pace of learning rates in education, then most probably there will be a certain problem within his core interactive capabilities. Of course, it was noted that he exemplifies a certain degree of fondness in dealing with people in a comical way but deep inside, Tony might also have some concerns in having an interaction with people in a serious manner. If he will realize his disadvantages over the people he will constantly interact with, he might experience a sense of inferiority or discrimination. Compassionate encouragement and kindness can minimize the inferiority factor this dilemma might induce (Kentucky Education Cabinet).   Ã‚  Ã‚  Ã‚   Helping the students to explore their capabilities is one way to nurture their personalities. But for individuals who have a relative disadvantage in learning, utmost assistance and care is needed beyond teaching. References Kentucky Education Cabinet. N.D. Learning Disabilities. Kentucky.gov. Retrieved February 4, 2008 from http://ada.ky.gov/learning_dis_def.htm.

Greek Legacies :: essays research papers

Greek legacies are their governmental systems, culture and arts, and science and technology. Classical Greece was a time where the growth of a community held strong through times of plague, wars, and numerous breakthroughs. A major legacy left by classical Greece was a government based on direct democracy. With a direct democracy, citizens ruled by majority vote. The citizenship was expanded to all free males, except foreigners. Those not considered citizens were women, slaves, and all foreigners. In 621 b.c.e., Draco, an Athenian lawmaker wrote the first legal code. In the legal code Draco dealt with contract and property ownership, it also included debt slavery. In classical Greece, citizens were also allowed to bring charges of wrong doing with a trial by jury. Direct democracy was a new innovation that not only changed the world, it also helped classical Greece become a great and powerful nation. Another legacy left by Greece was their culture and art. With their culture they created the Greek language. The Greeks also invented their mythology, which included gods and goddesses. Through myths, Greeks tried to understand the mysteries of nature and the power of human passion. God lived forever and Greeks attributed human qualities to them. The Olympic Games were originated in Greece around 776 b.c.e. They were dedicated to the god Zeus, the Greeks even suspended the wars between city-states so the athletes of the Olympics could compete. Philosophers, lovers of wisdom, were determined to seek the truth. There philosophy was based on two assumptions: (1) The universe (land, sky, and sea) is put together in an orderly way, and subject to absolute and unchanging laws, and (2) people can understand these laws through logic and reason. The three main philosophers of classical Greece are Socrates, Plato and Aristotle. The arts of classical Greece had a different flair than any other civilization. The Greeks invented both drama and built the first theaters in the west. Statues in Greece depicted their gods and goddesses in idealized human form, their faces neither showed laughter or anger, only serenity. Athena, goddess of wisdom, is found in the Parthenon, dressed in full battle armor, holding a six-foot high figure of victory. The Parthenon is a masterpiece of not only craftsmanship, but also design. Artisans built the 23,000 square ft. building with the traditional style that had been used several hundred years before. Classical Greece’s art and culture inspired Greeks to pursue their life as a privilege.

Pride and Prejudice Prediction Essay

In today’s society, everyone looks to find real love. They want to find â€Å"the right one†, get married, and live happily with that one person for as long as the world allows them. Some people will wait as long as it takes to find that special someone, while others find their true love in high school. Is it not amazing that we are given the opportunity to find our own love whenever we want? Then again, we are the only ones who know what we really want for ourselves. So, imagine if we did not get that opportunity of picking who we want to share our lives with for as long as we live.I have a hard time letting my mom pick out my clothes, let alone that special someone that I have to live the rest of my life with. In the book Pride and Prejudice by Jane Austen, life is the total opposite of what it is today. Instead of you getting to choose who you want to be with, that person is chosen for you. Sounds like an awful time. The mother would have to pick the spouse and all s he cared about was finding the wealthiest man. Two of the main characters that I want to talk about is Mr. Darcy and Elizabeth Bennet. From what I have read of the book so far, all these two have done is bicker and disagree on almost everything.But, I think they will fall in love anyway. Even though they seem like total opposites, I think their personalities are a lot alike because they are both very out spoken. Elizabeth Bennet is the second oldest daughter of the five Bennet sisters. She is also known to be the most intelligent, but she is often compared to her sister, Jane, as being of lesser beauty. She is always speaking her mind even though it was frowned upon as a lady during that time period, and she often gets funny looks for what comes out of her mouth.She is very independent and is not fond of people who tell her what to do, which is what that time period was all about for the women. Elizabeth has a very strong personality and it is very hard to confuse her with anyone el se. Mr. Darcy is a very wealthy man and is the master of Pemberley and he is also the nephew of Lady Catherine de Bourgh. Mr. Darcy is very intelligent and honest and he is quite proud of it. His excess amount of pride causes him to look down on others in lower social classes and he kind of treats Elizabeth like this in the beginning of the book.So far in the book he learns to control his temper and class-consciousness and starts to fall in love with Elizabeth and begins to admire her strong character and different personality. Quote: â€Å"Not at all,† he replied; â€Å"they were brightened by the exercise. † –Mr. Darcy In the quote, Mr. Darcy is telling Miss Bingley that Elizabeth looked rather well after all the exercise of walking to see her ill sister Jane. While Miss Bingley was making fun of Elizabeth for having a dirty petticoat, Mr. Darcy completely looked past the fact that she was muddy and a little bit of wreck from the long walk by herself.In fact, he talks about how nice her eyes looked from the exercise and complimented her. I think this quote is pretty important because Mr. Darcy is all about himself and so full of pride and it seems like he only likes to look down on people. But, he compliments Elizabeth when Miss Bingley was making fun of her. He ignores the fact that she is dirty and looks like a mess and only notices how bright her eyes looked from the exercise. I think this is so much of a big deal because Mr. Darcy never compliments anyone and really never says anything nice at all.I thought he was just looking past all of the obvious flaws that everyone else noticed and only looked at what caught his eye. Quote: â€Å"Elizabeth, having rather expected to affront him, was amazed at his gallantry; but there was a mixture of sweetness and archness in her manner which made it difficult for her to affront anybody; and Darcy had never been so bewitched by any woman as he was by her. He really believed that were it not for the inferiority of her connections, he should be in some danger. –Narrator This quote comes from chapter 10 after Mr. Darcy asks Elizabeth to dance with him. What Elizabeth said to Mr. Darcy after he asked her to dance was no because she thought he was going to despise her taste. She did not want to make a fool of herself, even though Mr. Darcy had no intention of doing so. The quote mentions how Elizabeth was amazed at his courtesy and thoughtfulness but there was a mixture of sweetness and mischievousness in the way he was acting and that she would have a hard time insulting anyone.I think this quote is important because even though Elizabeth just confronted him about the way she feels his attitude is towards her, she still finds him attractive in many ways. Then Mr. Darcy mentions how he had never been so bewitched by any other woman as he was by her. She just told him how she felt about him in a rude way and he still finds her so attractive, or that might have encouraged the way he feels towards her. I predict that Mr. Darcy and Elizabeth Bennet will fall in love by the end of the book.Even though they disagree and argue a lot throughout the book, their personalities are a lot alike since they are both so outspoken. One thing that happens between Mr. Darcy and Elizabeth is when she shows up to take care of her sister Jane and her petticoat is filthy but Mr. Darcy only talks about how nice her eyes looked from the exercise. Since he looks down on everyone else you would expect him to do the same during that moment. Another is when Elizabeth tells Mr. Darcy off and all they can both think about how attracted they are to one another.