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Essay on gallium and what its used for
Essay on gallium and what its used for
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Gallium Gallium is a chemical element in group 13 of the periodic table and atomic number 31. gallium does not occur in nature as free, but as gallium (III) compounds in trace amounts in bauxite and zinc ores. .Melting low as melts at 29.8 degrees can not be any holding it by hand it melts at body temperature. Gallium was discovered by a French chemist, Paul-Émile in 1875 by electrolysis of the solution of gallium hydroxide in potassium hydroxide. Sources of gallium On the ground crust estimated concentration 16 parts per million (ppm) was found in zinc and aluminum ores as well as Germinate (sulfide copper ores)) Applications Wide application of Gallium in optoelectronics, communications, aviation, households, such as alloys, computers,
The bottom of the capillary tube and the thermometer were submerged in a beaker of heating water. The water was stirred occasionally and heated very quickly. However, when the water reached 80 ˚C it was heated very slowly in order to not pass the melting point. 3. The temperature when alum melted was recorded in the data table.
A gallstone is a stone about the size of a pea, or marble which is made
Due to the natural processes of magma flow, hydrothermal gradients, sedimentation, and evaporation, minerals are concentrated in various areas of the Earth’s crust. Obtaining these minerals for human use involves four general steps. • Locating the minerals • Then, extracting the minerals from the Earth in the form of ore or rock Then, processing (smelting) the ore to separate the impurities from the desired mineral. Finally, creating a useful product from the minerals. Procedure 1.
Strontium was discovered by Adair Crawford, an Irish chemist, in 1790 while studying the mineral witherite (BaCO3). When he mixed witherite with hydrochloric acid (HCl), he did not get the results he expected. He assumed that his sample of witherite was contaminated with an unknown mineral, a mineral he named strontianite (SrCO3). Strontium was first isolated by Sir Humphry Davy, an English chemist, in 1808 through the electrolysis of a mixture of strontium chloride (SrCl2) and mercuric oxide (HgO). Strontium reacts vigorously with water and quickly tarnishes in air, so it must be stored out of contact with air and water. Due to its extreme reactivity to air, this element always naturally occurs combined with other elements and compounds. Strontium is very
Arsenic is the 20th most common element in the earth’s crust and can be found naturally in our environment. There is around 0.006 to 0.03 ppm or arsenic distributed in seawater, and 20 ppm of arsenic in soil (before pesticides). Every human will ingest about 0.5 to 1 mg of arsenic in a day from food and water, because arsenic is present in higher quantities in se...
Arsenic (As) is a lethal metalloid found in rocks, sediments, water, soil and air. It enters into the terrestrial and aquatic ecosystems through a combination of natural processes such as volcanism, process of weathering and biological activity, as well as a result of anthropogenic (Human made) activities. Excessive utilization of As-based pesticides, fertilizers or herbicides, wood preservatives, arsenic additives in domestic animals feeds, pharmaceutical works, electronics industries, ammunition and galvanizing factories, and coal or petroleum incineration (Simith et al., 1998:Matschullat, 2000), and indiscriminate disposal of industrial wastes and domestic (sewage) , as well as mining activities, have resulted in extensive contamination of Arsenic in soil / terrestrial ecosystems attracts worldwide attention principally because of its undesirable impact on human health(Lee et al., 2008; Duker et al., 2005; Liao et al., 2005; Liu et al., 2005; Ongley et al., 2007).
In the early hours of a cold morning, Gallup awaits death while the sun rises. Gallup’s morning “wake-up call’ consists of sirens often after another local was found frozen on the roadside with a liquor bottle near. Labeled as “Most patriotic small town” Gallup takes pride in a good title, but there is a bad side to Gallup, notoriously known as “Drunk town”. Gallup suffers from Poverty, homelessness and substance abuse on the reservations that come into the little town.
Vecuronium-bromide is a drug used prior to and during surgery. It has several benefits in surgical situations which makes it an ideal drug. It has a rapid onset and recovery time, it is easily administered which is a benefit for maintenance doses, it paralyses the trachea which aids in ease of endotracheal tubation, it also has very little cardiovascular or histamine releasing effects. All of these things combined make it an ideal drug in conjunction with other anesthesia medications for surgery as well as in long term use of intensive care unit patients (DailyMed 2009.)
The Gallup U.S. Daily is a great way to see how our country thinks about certain political or economical issues, topics, or controversies we are having. Since we do have an astonishing amount of people living in our country, taking surveys of a small group of them gives us an idea of what the general population thinks. The polls that do come through the website can also give us an insight for what we should expect for upcoming elections as many of the questions would ask about the upcoming candidates, their policy, and many other focuses surrounding the matter. The Gallup U.S. Daily is a very trusted and safe way for people to have their voice heard without giving their name or other personal information. The Daily has been very successful
Aluminum is the most abundant metallic constituent in the crust of the earth; only the nonmetals oxygen and silicon are more abundant. Aluminum is never found as a free metal; commonly as aluminum silicate or as a silicate of aluminum mixed with other metals such as sodium, potassium, iron, calcium, and magnesium. These silicates are not useful ores, for it is chemically difficult, and therefore an expensive process, to extract aluminum from them. bauxite an impure h...
Gold is a metal that is dense. Its density can be felt. It is not negligible as some elements appear to be. The element gets melted from solid to a liquid when it reaches a temperature of up to 1066 degrees. This is the melting point of element gold (Saunders, 2003).
Brand was obsessed with finding the Philosopher’s Stone; this stone reputedly could change metals into gold. With his discovery, this made Brand the first known discoverer of an element. In 1669, he isolated human urine and distilled it which resulted in a white and waxy material. Brand named this material phosphorus (light bearer) because it glowed in the dark. This discovery was kept a secret until 1680 when an English chemist Robert Boyle discovered phosphorus independently. Boyle’s definition of this element was simply “a substance that cannot be broken down into a simpler substance by a chemical reaction”. This definition of the element lasted for three centuries until the discovery of subatomic
In this paragragh I will be telling you about three scientist Ander's Celsius, Daniel Fahrenheit, and Lord Kelvin. I will be telling you when and where they lived and the melting and boiling points on there scales. Ander's Celsius was born on November 27th 1701 in Uppsala, Sweden. Anders created the Celsius thermometer scale. On Anders thermometer scale the melting point of water is 100 degrees celsius, and the boiling point on the scale is 0 degrees celsius. Daniel Fahrenheit is the next scientist I will tell you about. US is one of the few country's that still use Fahrenheit. Daniel Fahrenheit was born on May 14, 1686 in Danzig. Daniels tempeture scale is known as Fahrenheit. The tempeture of which things melt at on the scale 32 degrees fahrenheit,
When the water comes into contact with the pyrite, the chemical reactions that take place causes the water to increase in pH which will dissolve heavy metals which stay in solution. However, when the pH levels reach a certain stage, the iron can then precipitate out, coating sediments with the characteristic yellow, red or orange colourings (D.E.P. 2, 2002; U.S.G.S.; U.S.E.P.A., 2002). The rate that A.M.D. advances is also influenced by the presence of certain bacteria (Doyle; U.S.G.S). A.M.D that has dissolved heavy metals such as copper, lead and mercury can contaminate ground and surface water. Especially at risk are mines that are located above the water table (Keller, 2000; D.E.P. 2, 2002). The sources of water that get polluted can be surface water that permeates into the mine, shallow ground water flowing through the mine or any water that comes into contact with the waste tailings produced by mines.
Mine Tailings. (2008). The University of Arizona Superfund Research Program (SBRP). Retrieved February 12, 2011, from http://superfund.pharmacy.arizona.edu/Mine_Tailings.php