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Yousef Hallawa 8B

AOI-Human Ingenuity Does a connection or relationship exist between the reactivity of a metal and when it was discovered?. Yousef Hallawa 8B. Background Information.

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Yousef Hallawa 8B

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  1. AOI-Human IngenuityDoes a connection or relationship exist between the reactivity of a metal and when it was discovered? Yousef Hallawa 8B

  2. Background Information • Until now there are more than 100 known metals or metals that were know that existed for at least a while. Before decades and centuries they only found about 24 metals but as the centuries passed they found most and who knows if they’re still metals that humans didn’t find. • The first metals that were discovered were gold and copper until the end of the 17th century, back then only 12 metals were known. • Four of these metals: antimony,arsenic, zinc and bismuth , were found and discovered in the13th and 14th century, while other metals like platinum was discovered in the 16th century.

  3. This proves to us that the metals found in the earlier centuries were far less reactive than the ones found in recent times.

  4. Justifying My Results As years have past many different metals were discovered and all of these metals were experimented on by either scientists or us as student and teacher. Which should give us brief results of what metals are and what is there reactivity

  5. Examples of My Justifications.Example 1 • In 1817 Cadmium was discovered. Stroymeyer noted that zinc carbonate had a yellowish tinge not attributable to iron. Upon reduction he thought that the alloy contained two metals. The metals were separated by fractional distillation. At 800 C, as cadmium's boiling point is lower than zinc, the cadmium distilled first.

  6. Example 2 • By 1595,bismuth was produced by reduction of the oxide with carbon, but it was not until 1753 when bismuth was classified as an element of science. Zinc was known to the Chinese people in 1400. it was not until 1738 , when William Champion patented the zinc distillation process, thatgave zinc a common use.

  7. Example 3 Metals like: Magnesium, Potassium, Aluminum etc. could not be isolated, because they needed a complex method of separation which wascalled “Electrolysis” whichinvolve aelectrical energy to split them up. They were only found in nature as compounds, but not as elements because they are very reactive. These metals were found when electricity was invented in the nineteenth century.

  8. Example 4 • Before 1807 all the metals that were separated had been reduced by carbon or hydrogen. Humphrey Davy used the generating pile developed by Volta and demonstrated that water could be decomposed into hydrogen and oxygen . Next he tried a solution containing potash and again gained hydrogen and oxygen. Then he tried a piece of moistened potash which gave a result of negative electrode something that burned with a bright light.

  9. Bibliography: • "History of Metals." Department of Materials Science & Engineering. Web. 22 Nov. 2010. <http://neon.mems.cmu.edu/cramb/Processing/history.html>. • "Answers.com - Who Discovered Electricity and When." WikiAnswers - The Q&A Wiki. Web. 22 Nov. 2010. <http://wiki.answers.com/Q/Who_discovered_electricity_and_when>. • "The Middle Ages." PriMetals. Web. 22 Nov. 2010. <http://www.primetals.com/index.php?option=com_content&view=article&id=6&Itemid=6>. • "Metal." Wikipedia, the Free Encyclopedia. Web. 22 Nov. 2010. <http://en.wikipedia.org/wiki/Metal>. • Category, By. Metals - All About Metals Businesses, Properties, Markets and Careers. Web. 22 Nov. 2010. <http://metals.about.com/>.

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