Iodine can be described as the heaviest among regularly occurring halogens, which are specifically found in Group 17 (VIIA) within the periodic table. The periodic table involves a diagram that demonstrates how chemical compounds or elements are associated with one another. Iodine’s chemical aspects are identical to the highly placed lighter halogens, which include chlorine, bromine, and fluorine. However, its physical outlook tends to be distinctive as it mirrors a steel-gray element, which transforms it to a mesmerizing purple vapor upon incineration.
Bernard Courtois, a French scientist, accidentally discovered the chemical element, iodine, in 1811. Iodine is mainly found in seawater, where a grayish-solid compound is often left behind after intense water evaporation. Its most important aspect regards its ability to eradicate germs. Iodine is normally blended with disinfectants and germicides besides the medical purposes it serves. Iodine equally exhibits numerous unfamiliar but vital commercial purposes.
The basic characteristics of iodine are like that of other halogens on the periodic table, but with some conspicuous differences. Iodine is rated among most memorable and striking of all the chemical elements. When in its solid form, iodine appears as a grayish-black, heavy steel compound, but when subjected to combustion, the solid iodine sublimes, as opposed to melting; hence, sublimation refers to the direct transformation of a solid element into a gaseous state. The sublimed iodine vapor exhibits a violet color coupled with a strong odor. When placed in a cold iron bar among other similar objects, the vapor transforms back to a beautiful solid element with fragile, metallic crystals, as reported by Leung...
... middle of paper ...
...ion. Iodine has also commonly been used to modify inks and dyes. Generally, iodine is found in the iodide ions state, commonly from seawater and is always injected in the food chain through seaweed besides other sea-plants and other sources such as soils and minerals. Iodine is crucial to the everyday lives of all mankind, whether we know about it or not.
Works Cited
Abraham, Guy E. “The History of Iodine in Medicine Part I: From Discovery to Essentiality.”
The Original Internist, (2006): 34-49. Web. 6 Jan. 2014.
Hamrick, I., and Sandra H. Counts. “Vitamin and Mineral Supplements.” Primary Care: Clinics
in Office Practice, 35.4, (2008): 729-747.
Leung, Angela M., Lewis E. Braverman, and Elizabeth N. Pearce. “History of U.S. Iodine
Fortification and Supplementation.” Nutrients. 4.11 (2012): 1740–1746.
Then, an amount of KI (solid) about a size that would fit on a match head was dissolved in 0.05 of Potassium Iodate solution and about 1 mL of water and 1 mL of 1 M HCl were added, which exhibited a weak positive test for IO_3^- (aq). After the weak positive test, an amount of KI (solid) about a size that would fit on a match head was dissolved in about 1 mL of water and 1 mL of 1 M HCl, which exhibited a negative
This paper describes the methods used in the identification, investigation of properties, and synthesis of an unknown compound. The compound was identified as calcium nitrate by a variety of tests. When the compound was received, it was already known to be one of twelve possible ionic compounds. The flame test identified the presence of the calcium anion in the compound. The compound tested positive for the nitrate cation using the iron sulfate test. At this point it was hypothesized that the compound was calcium nitrate. Reactivity tests and quantitative analysis comparing the unknown compound with calcium nitrate supported this hypothesis. Synthesis reactions were then carried out and analyzed.
Safely Warning: Do not taste any substance in this activity. Iodine solution and some powders are hazardous...
Medicine has been developed and discovered for thousands of years; however, the 1920’s was the first decade that fashioned a pathway for new developments and discoveries. Medical professionals have taken a huge hit for their fight in finding new inventions that can save patients from death’s hands. In the 1920’s, medicine has also taken a tremendous leap in controlling fatal diseases such as diabetes (Pendergast 110). Medicine in the 1920’s has altered the way medicine is shaped today; furthermore, the development and discovery of the iron lung, penicillin, and insulin were the first pertinent breakthroughs in medical history (“Iron” par. 7; Grimsley par. 15; “Banting” par. 13).
...inePlus Medical Encyclopedia." U.S National Library of Medicine. U.S. National Library of Medicine, n.d. Web. 21 Apr. 2014.
This element when becoming an isotope can become radioactive due to its high activity as a metal. In its natural state it is a soft metal and it has a shiny “ wax “ like silver/white color to it, it is so soft that a knife could cut through it without a problem.
...atment is safe because radio-iodine is able to deliver a sufficient amount of radiation to the thyroid allowing to slow the hormone production, and only deliver a small amount to the body. The radiation delivered to the body is far from harmful and is only equivalent to the amount of radiation delivered from two routine diagnostic X-Ray procedures such as a gastrointestinal series ("Educational Material"). The form of treatment has been used for 35 years and over one million patients in the United States have been assisted through the treatment of radioactive iodine ablation. Most physicians will rely on this treatment and recommend 90 percent of their over active thyroid patients to receive the radioactive iodine ("Educational Material"). The treatment, till this day, is known to continuously alleviate the majority of symptoms hyperthyroidism patients have today.
Since ancient times vitamin D has been the predominant cause of bone deficiencies.1 However, it was not in till the seventeenth century when both Dr. Daniel Whistler and Professor Francis Glisson made the first scientific description of a vitamin D deficiency.2 During the mid-seventeenth century there was an increase amount of children that were diagnosed with the bone disease called rickets.2 The cause of the rickets was determined to be associated to the lack of sunlight. A German researcher Kurt Huldschinsky came to the conclusion that when infants were exposed to ultraviolet light rays they became cured of rickets2. He stated that a substance in the skin was the potential source of the cure.2 In 1922, American scientist Elmer McCollum proved that when cod liver oil was heated; the beneficial effects of vitamin A in the oil were reduced.2 However, the oil remained effective in curing rickets leading McCollum to reason that a nutrient different from vitamin A was present in the oil. As a result, he named this nutrient vitamin D, which became the fourth vitamin to be discovered and named.2 Additionally, shortly after 1918, vitamin D was also discovered by an accidental experiment that included a group of scientists curing dogs affected with rickets by feeding cod liver oil to them.1
Mention 2 elements that can be isolated from the pitchblende and one uses of any of them?
Discovery and Development of Penicillin. (2014, April 4). Retrieved from American Chemical Society International Historic Chemical Landmarks: https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/flemingpenicillin.html
In the reaction, potassium peroxodisulphate and potassium iodide will be used to provide the peroxodisulphate ions and iodide ions respectively. The ionic formula for the reaction is as follows:
Pale yellow precipitate appears the fastest, following with pale cream precipitate and white precipitate takes the longest time to appear. This shows that 1-iodobutane is most reactive whereas 1-chlorobutane is least reactive. The order of reactivity reflects the strengths of the carbon-halogen bonds. The carbon-iodine bond is the weakest and the carbon-chlorine the strongest of the three bonds. In order for a halide ion to be produced, the carbon-halogen bond has to be broken. The weaker the bond, the easier that is. Carbon atom is slightly positive when it attached to the halogen. It is slightly positive because most of the halogens are more electronegative than carbon, and so pull electrons away from the carbon. Chlorine is most electronegative compare to bromine and iodine, hence it drags most of the electrons away from carbon to form a strongest bonding. The bond between iodine and carbon is the weakest as iodine is least electronegative. So, the bond energy of carbon-chlorine is the highest whereas the bond energy of carbon-iodine is the
The first theory to do with the atom was by Democritus and Leucippus who first proposed the idea of the atom as an invisible particle that all matter is made of. However, the first real discovery of an element, besides those like Gold and Silver etc. (which people had been aware of before written history) was phosphorus, which was discovered by Henning Brand in 1649. In 1787, a French chemist called Antoine Lavoisier, made a list of all 33 known elements of the time. Between 1649 and 1869, the Periodic table was added to and in 1869 a total of 63 elements had been discovered. In 1864, John Newlands made a huge advancement in the arranging of these elements, as he was able to sort them in order of atomic weights and was also able to observe similar properties between elements. The creation of the Periodic table, however is considered to be done by Russian scientist Dimitri Mendeleev who proposed a table as a classification system for all of the elements that had been discovered and he even left spaces for elements that had not yet been discovered, but he predicted they would. The Periodic table contin...
Horowitz, N. H. (1997, July 23). Roger Wolcott Sperry. Retrieved November 19, 2013, from Nobelprize.org: http://www.nobelprize.org/nobel_prizes/medicine/laureates/1981/sperry-article.html
John Dalton�s Periodic Tables. 2014. John Dalton�s Periodic Tables. [ONLINE] Available at:http://www.sussexvt.k12.de.us/science/The%20History%20of%20the%20World%201500-1899/John%20Dalton's%20periodic%20tables.htm. [Accessed 12 May 2014].