Lead Facts - Element 82 or Pb

Lead Facts - Element 82 or Pb Lead is a heavy metallic element, commonly encountered in radiation shielding and soft alloys. Heres a collection of interesting facts about lead, including about its properties, uses, and sources. Interesting Lead Facts Lead is a relatively abundant element because it the endpoint of the decay schemes of many radioactive elements with higher atomic numbers.Because its fairly easy to extract (for a metal), lead has been used since prehistoric time. Lead was readily available to common people in the Roman Empire, finding use in dishes, plumbing, coins, and statues. People used it for everyday items for thousands of years, until if was finally found to be poisonous toward the end of the 19th century.Tetraethyl lead was added to gasoline to reduce engine knock in the 1920s. Even when it was invented, it was known to be poisonous. Several factory workers died from lead exposure. However, leaded gas wasnt phased out until the 1970s or banned for use in road vehicles until 1996. The metal is still used in car batteries, for making leaded glass, and for radiation shielding. Worldwide production and use of the metal continues to increase.Lead is a post-transition metal. Its not as reactive as many other meta ls, except in powdered state. It displays weak metallic character, often forming covalent bonds with other elements. The element readily bonds to itself, forming rings, chains, and polyhedrons. Unlike most metals, lead is soft, dull, and not very good at conducting electricity. Powdered lead burns with a blue-white flame. The powdered metal is pyrophoric.Pencil lead is actually the graphite form of carbon, but lead metal is soft enough to leave a mark. Lead was used as an early writing instrument.Lead compounds taste sweet. Lead acetate has been called sugar of lead and was used as a sweetener in the past.In the past, it was difficult for people to tell tin and lead apart. They were thought to be two forms of the same substance. Lead was called plumbum nigrum (black lead) while tin was called plumbum candidum (bright lead). Lead Atomic Data Element Name: Lead Symbol: Pb Atomic Number: 82 Atomic Weight: 207.2 Element Group: Basic Metal Discovery: Known to the ancients, with a history dating back at least 7000 years. Mentioned in the book of Exodus. Name Origin: Anglo-Saxon: lead; symbol from Latin: plumbum. Density (g/cc): 11.35 Melting Point (Â °K): 600.65 Boiling Point (Â °K): 2013 Properties: Lead is an extremely soft, highly malleable and ductile, poor electrical conductor, resistant to corrosion, blue-white shiny metal that tarnishes to dull gray in air. Lead is the only metal in which there is zero Thomson effect. Lead is a cumulative poison. Atomic Radius (pm): 175 Atomic Volume (cc/mol): 18.3 Covalent Radius (pm): 147 Ionic Radius: 84 (4e) 120 (2e) Specific Heat (20Â °C J/g mol): 0.159 Fusion Heat (kJ/mol): 4.77 Evaporation Heat (kJ/mol): 177.8 Debye Temperature (Â °K): 88.00 Pauling Negativity Number: 1.8 First Ionizing Energy (kJ/mol): 715.2 Oxidation States: 4, 2 Electronic Configuration: [Xe] 4f145d106s26p2 Lattice Structure: Face-Centered Cubic (FCC) Lattice Constant (Ã…): 4.950 Isotopes: Natural lead is a mixture of four stable isotopes: 204Pb (1.48%), 206Pb (23.6%), 207Pb (22.6%), and 208Pb (52.3%). Twenty-seven other isotopes are known, all radioactive. Uses: Lead is used as a sound absorber, x radiation shield, and to absorb vibrations. It is used in fishing weights, to coat the wicks of some candles, as a coolant (molten lead), as ballast, and for electrodes. Lead compounds are used in paints, insecticides, and storage batteries. The oxide is used to make leaded crystal and flint glass. Alloys are used as solder, pewter, type metal, bullets, shot, antifriction lubricants, and plumbing. Sources: Lead exists in its native form, though it is rare. Lead may be obtained from galena (PbS) by a roasting process. Other common lead minerals include anglesite, cerussite, and minim. Other Facts: Alchemists believed lead to be the oldest metal. It was associated with the planet Saturn. References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952)

Research Paper on Snowboarding

Research Paper on Snowboarding Snowboarding is a new sport that is very challenging and is attracting new fans all around the world. Snowboarding has really changed since it was first invented. It has become one of the fastest growing sports in America and the world. People everywhere including me are waiting for the snow to get a chance to go snowboarding. Snowboarding is the cross between surfing and skateboarding. Snowboarding has evolved into a great new sport but when it was first invented in the early 1900’s it was thought to be a child’s toy. Since that time it has changed from a child’s sport to a new competitive sport that features men and woman. Now days there are many competitions for snowboarding. Some people saw snowboarding as an alternative to surfing, skiing, and skateboarding. People who couldn’t buy surfing boards like Jake Burton used snowboarding as an alternative. It was a new sport and cheap to buy a snowboard. People who liked skateboarding saw snowboarding as a new sport that they could make their mark on. Nobody knows who invented the snowboard but in 1929 M.J. â€Å"Jack† Burchett invented one of the first snowboards. He cut out a piece of plywood and tried to secure his feet with some clothesline and horse reins. Thirty years later the next step in snowboarding was taken when Sherman Poppen, a chemical gases engineer invented â€Å"The Snurfer† as a toy for his daughter. Poppen made the â€Å"Snurfer† by bounding two skis together and putting a rope at the nose, so that the rider could hold it and keep it stable. Soon many of his daughter’s friends wanted a â€Å"Snurfer† too. So Poppen licensed his idea to a manufacturer and in 1966 â€Å"The Snurfer† sold over half a million times. In 1979 Poppen left the snowboarding business after Burton came up with the bindings and went back to his old profession. Another inventor was Jake Burton who became interested in snowboarding after taking part in Poppen’s â€Å"Snurfer† competitions that Poppen organized. His parents wouldn’t buy him a surfboard so riding the â€Å"Snurfer† was a new cool thing to do. In 1977 after he finished college Burton moved to Londonderry, Vermont to make money building different types of the Snurfer. He made his first boards out of laminated hardwood. While at a Snurfer competition in 1979 Burton shocked everyone by using his new board which had the first binding. The new binding made a big difference for handling the board and the binding made it easier for him to beat the other riders. In 1969 Dimitrije Milovich started making snowboards after he got the idea from sliding down a hill on a cafeteria plate in college. His snowboards were based on surfboards combined with the way skis work. In 1972 Dimitrije started a new company called â€Å"Winterstick†. He produced lots of snowboards and even got articles in magazines like â€Å"News Week†, â€Å"Playboy†, and â€Å"Power† which gave snowboarding lots of notoriety. In 1980 Milovich left the snowboarding business. He was still known as a very important pioneer of the sport. At the same time that Jake Burton was producing his snowboards Tom Sims produced his first snowboards in 1977. Sims was an avid skateboarder who made a â€Å"snowboard† in a junior high school shop class. He made his out of carpet wood and aluminum. He glued some carpet to the top of a piece of wood and put an aluminum sheeting on the bottom. He started making snowboards in 1977 in his garage with his friend and employee Chuck Barfoot. Barfoot actually made the boards and came up with the â€Å"Flying Yellow Banana†. It was a skateboard deck on top of a plastic shell with skegs. During 1980 Sims signed a skate-snowboarding deal with a big company Vision Sports. Signing the deal helped Sims get out of his financial problems but his friend Barfoot was left out and tried to go into business for himself but couldn’t compete with big competitors like Sims and Burton. The first modern competitive snowboarding contest took place in Leadville, Colorado in 1981. Then snowboarding competition took off from there and became world wide. In 1982 the first national snowboarding race was held in Suicide Six, outside of Woodstock, Vermont. Because of the conditions of the hill the goal of the race appeared to be mostly just surviving the race. The race was on a steep icy downhill run called â€Å"The Face†. Paul Graves put it on and Tom Simms and Jake Burton competed. Doug Bouton wins first place overall. This race marked the last time that snowboards and snurfer’s raced together. In 1983 Jake Burton puts on the national snowboarding championships in Snow Valley. A couple of months later Tom Sims holds the inaugural World Snowboarding Championships at Soda Springs Ski Bowl in Lake Tahoe. That contest featured the first contest with a half pipe. In 1986 the World Snowboarding Championships move from Soda Springs to Colorado. In 1986 a new European snowboarding generation is launched. Then the Europeans began to organize their own regional events like the Swiss Championships in St. Moritz. In 1987 a group of riders and manufacturers form N.A.S.B.A. who’s main goal is to create a unified World Cup tour with the Europeans. In 1988 N.A.S.B.A. got its wish and the first world cup was held in both Europe and the United States. On a interesting note one million dollars is spent on the Victoria World Cup in Japan. It was the most expensive snowboarding contest ever. In 1994 everybody was happy because snowboarding was declared a Winter Olympic sport. It was finally accepted as a real competitive sport. In the 1998 Olympics in Nagano, Japan it was the first time ever that snowboarding was in the Olympics.

Blog Writing on Bani Bani Bani Re Bani

Blog writing on â€Å"Bani Bani Bani Re Bani† from â€Å"Main Prem Ki Diwani Hoon†.    Bani Bani song is taken from Main Prem Ki Diwani Hoon. This song is a dance performance by Kareena Kapoor. Chitra, the singer of Bani Bani voice was high-pitched as ever. Her dandiyal or tribal tune happens as courtesy of her effervescence. Bani Bani is the most passionate song of the year. Music of main prem ki Diwani hoon is beautiful song and new feel in the particular song. Anu Malik proves as genius musician for the movie ("Bani Bani - Main Prem Ki Diwani Hoon _ HD"). Kareena Kapoor is delight to watch in this song. She is wearing red legenga dress in the song and dances in every beat of the song. Kareena Kapoor was remarkable throughout the film. Main Prem Ki Diwani Hoon is worth successor of one of the Sooraj R Barjatya previous hits. Bani Bani is one good picturised song. This is a peppy Bollywood Song that is sung by Chitra released in the year 2003. It is from Rajshri Productions starring Kareena Kapoor, Hrithik Roshan and Abhishek Bachchan. This song was beautifully choreo graphed and Kareena Kapoor provides justice in following the steps in nice way. As far as review is concerned, it has diverse opinion from viewers who have watched the movie. Some feels Sooraj; the Director had successfully won heart of audience the fourth time. Some felt that the movie was worst movie in Bollywood. According to few viewers, the song could have been made better with much better steps.   I feel that Kareena Kapoor has the potential in giving more edge to the dancing steps of Bani Bani. She has done justice in following the steps of the choreographer and putting her best to entertain her fans and audience. I felt this was one of the best songs from Main Prem Ki Diwani Hoon. This dance was performed by Sanjana (Kareena Kapoor) at one of her college fest. She was happy and refrained in the song with bit of sadness as Prem (Hrithik) was not present in the show for watching it. As Kareena was in love with Prem, she was imagining him in each of the steps and b ing happy by his presence. However, in actual, Prem (Abhishek Bachchan) was watching Sanjana dance and enjoying her beautiful presence on stage. Abhishek Bachchan visualizes his life with Sanjana and gets mesmerized by her dancing skills and expression. He was constantly staring at Kareena’s performance without blinking his eyes for a second. Sanjana’s dad was frustrated of the fact that her daughter was imagining Hrithik as her life partner, which is not the real motive of her mother. On the other hand, her mother was happy, as Sanjana will get married to rich businessperson like her elder sister. There was great confus ion in the movie that was revealed at the end with a â€Å"happy ending†. This song was set with vibrant colours and ravishing background. It gave the feel of â€Å"that† bollywood magical- romantic song which every happy go lucky girl would love to hum and dance.  Ã‚   "Bani Bani - Main Prem Ki Diwani Hoon _ HD".  YouTube. N.p., 2016. Web. 13 June 2016.

Benefits of Walking Essay Example | Topics and Well Written Essays - 250 words

Benefits of Walking - Essay Example Walking reduces weight by burning excessive calories in the body. For instance, a person who weighs sixty kilograms can burn up to seventy-five calories simply by walking for thirty minutes at 2mph. walking is therefore an exercise highly recommended for people who would like to lose weight. The faster an individual walks for a given time duration, the more calories are burned. Another health benefit of walking is that walking lowers the risk of getting certain diseases. Brisk walking for up to thirty minutes daily can help reduce the risks of getting diseases such as diabetes, high blood pressure, heart diseases, certain type of cancer and asthma among others. Doctors believe that walking improves blood circulation within the body therefore reducing the risks of getting diseases. In addition to lowering the risk of acquiring certain diseases and maintain good weight, walking gives an individual energy. Although it may seem a paradox, researchers have found out that brisk walking is an energizer. As an individual walks, blood circulation in the body is boosted which implies that oxygen supply in the body becomes sufficient thereby making one to feel energetic and alive. Walking also eases the muscle tension, strengthens joints and hence making an individual feel relaxed, and

Historical Developments that Presented New Opportunities and Desires Term Paper

Historical Developments that Presented New Opportunities and Desires for Women - Term Paper Example Introduction Today, with women occupying many high ranking positions at work both in the private and public sectors, it is difficult to imagine and contextualize a time in the past when they were confined to the household and generally restricted and discriminated upon when it comes to the issue of working and employment. It is even no longer fashionable to talk about the glass ceiling in the corporate ladder presently because many female executives are making waves in the corporate world. While, America is yet to see a female president, there is no shortage of powerful female politicians that became influential in Washington and overseas. It is, unarguably, the best time yet for American women to live, work, compete and achieve things for themselves. Looking back, the women of the past were not that lucky. They have to fight for equality and for the recognition that they, too, have rights and capabilities that can be as useful and meaningful as those of men’s. Remember the La dies In the early years of the United States as a country, the first opportunity for change emerged. It was in search for the values, norms, identity and character that would define the nation. There are several notable women who made a difference and helped shape the course of the path that America took during these times. For instance, there is the case of the documented correspondence between John Adams and his wife, Abigail Adams, which demonstrated how Mrs. Adams led the women of her day to empower women and fight for their rights. In a letter dated March 31, 1776, she wrote her husband during the Continental Congress, which is on the process of drafting the Declaration of Independence. She reminded Adams that: I long to hear that you have declared an independency. And, by the way, in the new code of laws which I suppose it will be necessary for you to make, I desire you would remember the ladies and be more generous and favorable to them than your ancestors. The correspondence did not reveal the extent of the impact of Abigail Adams’ admonitions. In the end, the Founding Fathers came up with the classic line in the Declaration that, â€Å"all men are created equal.† Her experience depicted how the American society during this period has displayed a stereotypical view of women, wherein they are widely seen to belong at home in the so-called cult of domesticity. Nonetheless, Abigail Adams is considered one of the pioneering women that launched the process of women emancipation and gender equality. Her actions served as an inspiration for many feminists that would come after her. More and more women became educated as schools were set up for them by individuals who advocate equal rights. There are numerous other developments driven by individual personages and they all influenced the trajectory of women empowerment later on. In 1933, Eleanor Roosevelt became influential in advancing many of the women’s causes. During the Great Depressio n, she was at the forefront of those exhorting women to contribute something to their country and to alleviate the crisis. In one of her pronouncements, she stated that, â€Å"The women know that life must go on and that the needs of life must be met and it is their courage and determination which, time and again, have pulled us

Interactive Whiteboards Essay Example | Topics and Well Written Essays - 750 words

Interactive Whiteboards - Essay Example "And the color, movement, sound and participation all come without messy chalk, stinky dry erase markers and copies of transparencies" (par. 2). Interactive whiteboards offer tremendous benefits not only for students, but also for teachers. They assist "people of many learning styles and save teachers time and space. Lessons can be saved into the system and can easily incorporate countless videos, maps, photos and websites. Teachers can pause videos and write notes on the screen, science classes can explore frogs through virtual dissection and geometry figures can be rotated, shrunk or expanded" (par. 18). In short, they make classroom instruction more efficient and learning more fun and interesting. The ability to harness the power, depth and breadth of the internet in this manner offers infinite new ways to try and reach out to students to grab their attention and improve their understanding of the material. There are many examples of ways in which this new technology has been and can be applied within the classroom. "Teachers can put a pyramid on the board and turn it so the class can see all the angles and sides. Students can count vertices by touching them on the board and setting them off in another color. Teachers can bounce between editing a paper on the board to searching for something online to illustrating what 1/16th of an inch looks like on a ruler" (par. 4). Any subject from math to literature to art and music can greatly benefit from these cybertronic chalkboards. This emerging hardware technology is significant because of its potential to revolutionize classrooms and teaching approaches. In the past, classroom instruction has tended to be one dimensional, very static, and non-interactive. Teachers would write on chalkboards or overhead slides, and would often be confined to the limited universe of often out-of-date instructional aids and materials to which they happened to have access. The ability of students to actively participate in a lesson, beyond raising their hand to answer the teacher's questions or make comments in a class discussion, was quite limited. With interactive whiteboards, teachers have the ability to take their lessons "outside of the box." Virtually any material available on the internet that pertains to the subject matter being taught can be summoned right then and there during a classroom lesson. This enables a much more detailed, nuanced and up-to-date discussion of the material. Further, students have a much greater opportunity to participate in the lesson in a meaningful way in which they can really interact with and digest the material. For example, at Centerville Elementary School in Minnesota, the technology prompted students to utilize their down time more productively, gathering around the board to review the material that had been taught earlier. "Using their fingers they dragged numbers on the screen into blank spots on a triangle as part of a math problem. When it's time for the class to leave for their next activity, one student pleads to the teacher, 'Can we check if it's right before we go'" (par. 11). As part of a literature lesson at the same school, teacher Tony Valenti used the device to bring to life the book

Applied science Report Research Paper Example | Topics and Well Written Essays - 1250 words

Applied science Report - Research Paper Example While clinical science includes a scientific component, it also includes aspects of care such as communication and knowledge, acquired through interaction in the health care environment. Clinical science is distinguished from medical practice, in that it includes experiences and knowledge gained through interaction, as well as relevant data surrounding clinical issues. Daniels & Powell (2006) define clinical science as â€Å"the contributions of scientific disciplines to health promotion and the prevention, diagnosis and treatment of disease through the development, communication and application of new knowledge.† The definition does not suggest, however, the existing knowledge and experiences are cast aside, in preference of more current findings. It implies that existing knowledge, experience and data can be used to further advance or develop new methods of inquiry and new approaches for the clinical setting. Two topics of interest in clinical science today are those of exer cise and sports psychology. Exercise is an increasingly important topic, as more Americans face health issues, due to sedentary lifestyles. Benefits of regular exercise are linked to longevity and holistic wellbeing of a person. Sports psychology is an important topic, as it provides insight into how top athletes develop and how they are able to become the best and fiercest competitors. This report will investigate how a physical activity program and visualization techniques can be coupled, to improve overall fitness. â€Å"Numerous athletes are turning towards mental imagery to take their game to the next level† (Plessinger, 2011). Understanding how athletes use imagery can help those who adopt a regular exercise program achieve the results they desire. Research Method The method of research used for this report is inquiry into current literature on both the benefits of regular exercise and the benefits of visualization in exercise. Data collected from literature includes sc ientific journals on exercise and sports performance, with the inclusion of reports available on the internet, which focus on health benefits of exercise and the benefits of visualization in sports. Key words used to find relevant literature include visualization in sports, benefits of regular exercise, mental imagery in sports, science in exercise and use of mental imagery in competition. The databases used for journal articles are Academic Search Premier, for articles in Journal of Sports Behavior and Ebscohost, for Journal of Physiological Anthropology. Ebscohost is also used for the Book by Carol W. Kraak and Vivica I. Articles pertaining to sports performance were also obtained directly from the Vanderbilt University, Psychology Department website and from the University of Minnesota, Department of Medicine site. Findings Physical Exercise With realization on benefits of regular exercise comes the pressure of incorporating exercise program into already over-crowded and busy dai ly routines. This means that maximal benefits are sought under the shortest span possible, predisposing one to risk of injury and chronic fatigue. Therefore, there is need to formulate a proper working out program. It is of great importance that before commencing an exercise program, one should consult with a clinical physician or a qualified sports physician. This takes