Trace element
“A chemical element whose concentration is very low and required only in small amounts by living organisms for normal growth or in a particular sample or environment.” Cobalt
Cobalt is trace element which is found on earth crust only in chemically combined form. The free element produced by smelting, is a hard lustrous, silver-gray colored metal.
Physical properties
• Color Metallic gray
• Density 8.90g/cm3
• Boiling point 3200K (1495C)
• melting point 1768K
• Heat capacity 24.81J/(mol-K)
In periodic table
Block d-block
Category transitional metal
Group 9
Period 4
Chemical properties
Cobalt is a hard ferromagnetic, silver-white,
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Megallium , vitallium, ultimet) in magnets and magnetic recording media, as catalysts for the petroleum and chemical industries, as drying agents for paints and inks. Cobalt blue is important part of artists, stained glass, tiles and for making enamel jewelry. The radioactive isotopes, cobalt-60, is used in medical treatment and also to irradiate food, with aim to preserve the food and protect the consumer.
Cobalt in the environment
Cobalt is of relatively in low amount in the Earth's crust and in natural waters, from which it is precipitated as the highly insoluble cobalt sulfine CoS.
Although the average level of cobalt in soils is 10-30 ppm, there are soils with as little as 0.1 ppm and others with as much as 70 ppm of cobalt. In the marine environment cobalt is needed by algae and other nitrogen fixing organisms. it is not found as a free metal and is found in the form of ores. it is not mined alone, and it is produced as a by-product of nickel and copper mining activities. The most common ores of cobalt are cobaltite, erythrite, glaucodot, and skutterudite. The world's major producers and suppliers of cobalt are the Congo,China, Zambia, Russia and Australia.
World production is 17.000 tons per year.
Deficiency symptoms in
Cadet Eric Wiggins Date: 18 September 2014 Course Name: Chem 100 Instructor: Captain Zuniga Section: M3A Identification of a Copper Mineral Intro Minerals are elements or compounds that are created in the Earth by geological processes. The method of isolating metals in a compound mineral is normally conducted through two processes.
Copper Sun by Sharon M. Draper is about Amari, a slave, and Polly, an indentured servant, who embarks on a long and painful journey from her home, to Mr.Derby’s plantation, to the lands of Fort Mose. Amari was just an average African-American living in a peaceful village until one day, white people came and massacred her entire village except for the young and strong people. They were taken away and sold into slavery. Amari got sold to Mr. Derby, a rice plantation owner. He bought Amari as a gift for his son Clay for his sixteenth birthday.
In a capitalist world, there are many opportunities to succeed, but an individual must be willing to work hard in order to ascend the social ladder. In Nickel and Dimed by Barbara Ehrenreich, she undergoes an experiment to see whether or not the average low-wage worker can get by in America. Ehrenreich claims that based on the wages that the low wage worker receives, he/she can not really get by and thus they don’t really have a way to get up out of poverty. However, the working poor do in fact have an opportunities to succeed, such as working up the corporate ladder from the bottom and saving money to build wealth, making Ehrenreich’s argument invalid.
Copper Transformations Prelab Questions Three metals ions are Magnesium, Iron, and Nickel. Iron is used in the sea with iron rich minerals, for substances. Iron was also used in the formation of earth.
Metal cations can be identified based on the colors they emitted off when heated in a flame.1 When atoms of the ions that were tested are excited, their electrons move up to higher levels of energy.2 When the electrons relax and return to the original states, they emit photons of specific energy creating wavelengths of light that produces colors.3 The test wire and Bunsen Burner were used to excite the solution in the crucible. The standard metal cations that were tested and their outcomes are as shown in Table 1.
Copper Sun Essay Question Two Slave revolts sometimes occurred but not very often. Slaves greatly outnumbered masters, so why weren’t there more? Many things were in place to prevent an uprising, these being some of the most important: Slaves didn’t have weapons other than their fists and handmade clubs, while the masters had whips, guns and knives. Slaves were too scared to disobey, because the punishments were extreme and barbaric.
The unknown sample in cup number 6 is a metal because it is a good conductor of electricity, lustrous, and can be bent and not completely broken. Also it did not break down when acid was added to it meaning it has more of a basic
Copper is also a very important element in the medical field. Also, the united states penny was originally made from pure copper. Finally, the Statue of Liberty did not always look green. Copper was the first element manipulated by humans. It is now, currently still a major metal industry.
solid 1.0M Zinc sulfate - blue liquid Copper metal
Copper Sun Essay There is plenty of brutality in the world today. On the news there are many examples of hate crimes. For example, white people are killing people of color, especially African Americans, for little to no reason. In the 14th amendment, women were granted the same equal rights as men, however women are still looked down upon and get treated differently.
Q1A: What is the mechanism of action of colistin? Colistin is an antibiotic that works best against Gram-negative bacteria. It works by binding to LPSs (lipopolysaccrides) and phospholipids in the outer cell membrane of the bacteria. This, in turn, disrupts the outer cell membrane by displacing cations and leaking the intracellular contents, combining it with outer cellular contents, causing the bacteria to be unable to differentiate the bacteria’s intra and outer cellular contents from one another.
Moving one step forward, the remaining choices are Manganese, Aluminum, Lead, Zinc, Tin, Nickel, Cadmium, and Chromium. At this point, the density can be used to classify since a few of the choices have been removed. Approximately at 25 degrees Celsius, Manganese has a density of 7.44, Aluminum with 2.70, Lead is at 11.35, 7.13 for Zinc, 7.31 for Tin, 8.91 for Nickel, 8.65 for Cadmium, and 7.19 for Chromium, where all of the densities have a unit of g/cm3. Based on information from the experiment sheet, it is affirmed that the calculated density of the unknown metal should be accurate to about 0.1%, although eliminating options based on this would not be reasonable, as lab data is not necessarily consistent every time. On top of density, logic and reasoning can also be used.
The mood created by the mise en scene in Arsenic and Old Lace is haunting. The mood of this is created through the graveyard scene in the window and the low, shady lighting of the candles and lamp. This mood is made in contrast to the comedic aspects of the play, emphasizing the play being a dark comedy. The major themes throughout this play are right vs. wrong, death, and family relations. The theme of right vs. wrong is made through Abby and Martha in their belief that they are “saving” the men through putting them out of their miseries as lonely old men.
Halogens have many different uses. Bromine, Chlorine, and Iodine are three main halogens. Bromine is the only liquid metal that is a halogen. Chlorine is the most abundant halogen. Iodine is a shiny, purple-gray solid.
Empirical Formula of Magnesium Oxide - Lab Report Background Information/Introduction: The aim of this lab is to determine the empirical formula of magnesium oxide by converting magnesium to magnesium oxide. As an alkali earth metal, magnesium reacts violently when heated with oxygen to produce magnesium oxide and magnesium nitride as a byproduct. In order to obtain only magnesium oxide, distilled water was added so that magnesium nitride will react and convert to magnesium hydroxide. Further heating then oxidizes all of the magnesium into magnesium oxide.