06 | Oktober | 2010 | Periode 4 Logam Transisi [PDF]

Oct 6, 2010 - 2 posts published by isolution3 on October 6, 2010.

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Periode 4 Logam Transisi The solution for chemistry . ask us and help us . Feeds:

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Archive for Oktober 6th, 2010

CONGRATULATIONS !!! Posted in Uncategorized, tagged Golongan Transisi, logam transisi, periode 4, periode 4 golongan transisi, periode 4 logam transisi on 6 Oktober 2010| Leave a Comment » Kami admin https://isolution3.wordpress.com/ (https://isolution3.wordpress.com/) mengucapkan berjuta – juta terima kasih kepada kalian semua yang telah berkenan meluangkan waktu kalian untuk mengunjungi blog ini !! Tujuan pertama kami untuk muncul di google.co.id telah tercapai berkat kalian semua !!! Post ini didedikasikan untuk kalian semua !! Dibawah ini nick name admin https://isolution3.wordpress.com/ (https://isolution3.wordpress.com/) -MoonAlice- [Naqi] , Ilyui [Ilyas], Bhudug*[Ali], Burung Pitung* [Isro] yang diberi tanda* nick namenya masi bisa berubah . soalnya blum pasti . BY THE WAY !!! YOU ARE ALL GREAT !! THANKS A LOT MY FRIENDS !!!

WHAT A WONDERFULL WORLD !!!

Untuk lebih jelasnya bisa di unduh disini !! Jelas (https://isolution3.files.wordpress.com/2010/10/jelas.docx) Report this ad

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What’s up with manganese [Mn] ???? Posted in Periode 4 Logam Transisi, tagged gambar golongan b, gambar periode 4, gambar unsur transisi, golongan 4, golongan b, logam transisi, periode 4, periode 4 golongan transisi, periode 4 logam transisi, transisi on 6 Oktober 2010| 2 Comments » First thing first isolution3 would like to give a ton of applause to the University of Nottingham UK. This data below is from the University of Nottingham. This is the basic data from them about manganese. Furthermore, from this day isolution3 will use the basic information of Transactinides/Transition from the basic data from to the University of Nottingham. Manganese [Mn] (https://isolution3.files.wordpress.com/2010/10/nottlogo.jpg) The university of Nottingham

An: (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\an.htm) 25 N:

(https://isolution3.files.wordpress.com/2010/10/mangan.jpg) Mangan (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\neutron.htm) 30 Am: (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\am.htm) 54.938049 g/mol Group No: 7 Group Name: Transition metals Block: d-block Period: 4 State: solid at 298 K Colour: silvery metallic Classification: Metallic Boiling Point: (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\bp.htm) 2234K (2061°C) Melting Point: (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\mp.htm) 1519K (1246°C) Density: 7.21g/cm3 Discovery Information Who: Johann Gahn (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\biography\jgg.htm) When: 1774 Where: Sweden Name Origin Latin: mangnes (magnet); Ital. manganese. Sources Most abundant ores are pyrolusite (MnO 2), braunite (Mn2+Mn3+6SiO 12), psilomelane [(BaH 2O)2Mn5O 10] and rhodochrosite (MnCO 3). Manganese is mined in South Africa (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\ZA.htm), Russia (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\RU.htm), Ukraine (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\UA.htm), Georgia (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\GE.htm), Gabon (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\GA.htm) and Australia (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\AU.htm). Vast quantities of manganese exist in manganese nodules on the ocean (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\ZZ.htm) floor. Attempts to find economically viable methods of harvesting manganese nodules were abandoned in the 1970s. Annual production is around 6.2 million tons. Abundance Universe: 8 ppm (by weight) Sun: 10 ppm (by weight) Carbonaceous meteorite: 2800 ppm Earth’s Crust: 1100 ppm Seawater: Atlantic surface: 1 x 10-4 ppm Atlantic deep: 9.6 x 10-5 ppm

Pacific surface: 1 x 10-4 ppm Pacific deep: 4 x 10-5 ppm Human: 200 ppb by weight 23 ppb by atoms Uses Manganese is essential to iron (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\elements\26.htm) and steel production, it also used in some aluminium (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\elements\13.htm) alloys (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\alloy.htm). It is also used in making; batteries, axles, rail switches, safes, ploughs and ceramics. Manganese is used to decolourize glass (removing the greenish tinge that presence of iron (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\elements\26.htm) produces) and, in higher concentration, make violet-coloured glass. Potassium permanganate (KMnO 4) is a potent oxidizer and used in chemistry and in medicine as a disinfectant. History The origin of the name manganese is complex. In ancient times, two black minerals from Magnesia in what is now modern Greece (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\GR.htm) were both called magnes, but were thought to differ in gender. The male magnes attracted iron, and was the iron ore we now know as loadstone or magnetite, and which probably gave us the term magnet. The female magnes ore did not attract iron, but was used to decolourize glass. This feminine magnes was later called magnesia, known now in modern times as pyrolusite (MnO 2) or manganese dioxide. This mineral is never magnetic (although manganese itself is paramagnetic). In the 16th century, it was called manganesum by glassmakers, possibly as a corruption of two words since alchemists and glassmakers eventually had to differentiate a magnesia negra (the black ore) from magnesia alba (a white ore, also from Magnesia, also useful in glassmaking). Mercati called magnesia negra Manganesa, and finally the metal isolated from it became known as manganese (German: Mangan). The name magnesia eventually was then used to refer only to the white magnesia alba (magnesium oxide), which provided the name magnesium for that free element, when it was eventually isolated, much later. Manganese compounds were in use in prehistoric times; paints that were pigmented with manganese dioxide can be traced back 17,000 years. The Egypt (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\country\EG.htm)ians and Romans used manganese compounds in glass-making, to either remove colour from glass or add colour to it. Manganese can be found in the iron ores used by the Spartans. Some speculate that the exceptional hardness of Spartan steels derives from the inadvertent production of an iron-manganese alloy. In the 17th century, German chemist Johann Glauber first produced permanganate, a useful laboratory reagent (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\glossary\reagent.htm) (although some people believe that it was discovered by Ignites Kaim in 1770). By the mid-18th century, manganese dioxide was in use in the manufacture of chlorine (which it produces when mixed with hydrochloric acid (HCl), or commercially with a mixture of dilute sulfuric acid and sodium chloride). The Swedish chemist Scheele (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\biography\kws.htm) was the first to recognize that manganese was an element, and his colleague, Johan Gottlieb Gahn (\Program%20Files\freshney.org\Periodic%20Table%20Explorer\data\EN\biography\jgg.htm), isolated the pure element in 1774 by reduction of the dioxide with carbon. Around the beginning of the 19th century, scientists began exploring the use of manganese in steelmaking, with patents being granted for its use at the time. In 1816, it was noted that adding manganese to iron made it harder, without making it any more brittle. In 1837, British academic James Couper noted an association between heavy exposure to manganese in mines with a form of Parkinson’s Disease. In 1912, manganese phosphating electrochemical conversion coatings for protecting firearms against rust and corrosion were patented in the United States, and have seen widespread use ever since. In the 20th century, manganese dioxide has seen wide commercial use as the chief cathodic material for commercial disposable dry cells and dry batteries of both the standard (carbon-zinc) and alkaline type. Notes More than 25 million tonnes of manganese ores are mined every year, representing 5 million tons of the metal, reserves of manganese are estimated to exceed 3 billion tonnes. Hazards Manganese is one out of three toxic essential trace elements, which means that it is not only necessary for humans to survive, but it is also toxic when too high concentrations are present in a human body. When people do not live up to the recommended daily allowances their health will decrease. But when the uptake is too high health problems will also occur. This post publish to show how glad we were !!! Thanks The university of nottingham !!! REPOST !!!! Ini bukan tulisan kami !!! REPOST DARI THE UNIVERSITY OF NOTTINGHAM !!!! REPOST !!! Read Full Post » (https://isolution3.wordpress.com/2010/10/06/whats-up-with-manganese-mn/)

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