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...
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...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.
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Iodine turns into a blue/black color when in the presence of starch, after using iodine if the blue/black color is absent then the starch has been used usually making a halo around the inoculum, resulting in a positive result. If it stays blue/black then the starch is still present meaning the organism cannot produce amylase causing a negative result. My color stayed blue/black and there was no evidence of a halo, meaning my organism is negative for producing amylase. (handout, amylase)
Neon was discovered in 1898 by British chemists Sir William Ramsay and Morris W. Travers as a component of the most volatile fraction of liquefied crude argon obtained from air. Upon applying an electric current to it, the chemists found that it had an orange glow, and they decided that it was not argon, but rather a new element altogether.
The Iodine Clock Investigation Introduction This is an investigation into the rate of a reaction and the factors that contribute to how fast a reaction will take place. Through the recording and analysis of raw data, this investigation also allows us to apply generally accepted scientific rules and to test them against results gained from accurate experimental procedures. Aim The aim of this experiment is to investigate the rate at which iodine is formed when the concentration and temperature of the reactants are varied, and to attempt to find the order and activation energy. The Chemistry 'THE IODINE CLOCK' - This is the experiment that will be used to investigate reaction rates, and it is a reaction between acidified hydrogen peroxide and potassium iodide: 2H+(aq)
Holmium is a chemical element and is the sixty seventh element on the periodic table. It is located in Period six and it is a member of the lanthanide group. It was discovered in 1879 by a Swedish chemist named Per Theodor Cleve. Like Carl Gustaf Monsander who discovered the elements lanthanum, erbium and terbium Theodor also used similar strategy's to find contaminants in the oxides of uncommon earth elements. He first looked at the oxide of erbium and was able to split it into two types of materials one being brown and the other green. This in turn caused Theodor to find the oxide of holmium (it was the brown material which is known as holmia) and this was how the element holmium was discovered.
In 1790 a discovery was made by an Irish Chemist named Adair Crawford. This discovery was the thirty-eighth element on the periodic table, Strontium. Its name comes from the town Strontian, Scotland where it was discovered. Strontium is a metal and belongs to the alkaline earth metals. “The alkaline earth elements are metallic elements found in the second group of the periodic table. All alkaline earth elements have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found free in nature” (Bentor). Being in period number five, Strontium has an atomic number of thirty eight which represents the number of protons in the nucleus. There are approximately eight-seven point sixty-two protons and neutrons in the atom which gives Strontium its atomic mass. Another way that Strontium can be represented is through its symbol Sr.
Elements are the basic building blocks of matter due to the fact that they are chemically the simplest substances. Whether we can find them in the air or in our gold/silver necklaces, elements are everywhere! One essential element is hydrogen, the first element on the period table (located under Group 1 as an alkaline metal) is composed of a single proton and electron; therefore having an atomic number and atomic mass of 1 and electron configuration of 1s1. In fact, hydrogen is the lightest, simplest and most commonly found chemical element in the universe (it makes up about 90% of the universe by weight). Interestingly enough, the heavier elements on the periodic table were either made from hydrogen or other elements that were made from hydrogen. The most common isotope formed of hydrogen is protium, with 1 proton and no neutrons. Hydrogen can also exist as both positively or negatively charged. The physical form of hydrogen at room temperature is a colorless and odorless gas. Hydrogen gas is extremely flammable and because of this chemical property, it is used as fuel for the main engine of space shuttles. Hydrogen is an important element and has received a lot of recognition throughout history for its usefulness.
Aynsley, E.E. and Campbell, W.A. .Journal of Medical History, v.6, (July 1962) Johann Konrad Dippel, 1673-1734.
In 1938, iodine-131 and cobalt-60 isotopes were discovered by J. Livingood and G. Seaborg. 2
An element in chemistry is more than just an element; at least Chlorine is more than just an element. It is very useful in many ways that help people today. Chlorine is a common nonmetallic element belonging to the halogens; it is a heavy yellow irritating toxic gas; it is used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt. People should know more about the uses of chlorine and why chlorine is used in many processes, for example; bleaching, and why we use it today. Everything has to start somewhere, and chlorine was produced many years ago.
Mention 2 elements that can be isolated from the pitchblende and one uses of any of them?
Have you ever wondered how the world would be like if there wasn’t innovative people before our time? What would health care be like without the help of scientist and doctors who have gone before us? Sir John Simon was born in London on October 10th 1816, he was the sixth child out of fourteen. He was the son of Louis Michael Simon and Mathide Nonnet. Simon’s father was a shipbroker which brought the family some wealth. His father had served in the Committee of Stock Exchange from 1837-1868. When Simon was in grade school is, family had enough money to send him to excellent schools. During his adolescents, he attended Pentonville for seven and a half years. In 1833, Simon became an apprentice to Joseph Hennery Green, he was a surgeon at St. Thomas Hospital and a professor of surgery. This began his journey in healthcare and science.
It was 1939 was when the use of radioisotope in medical clinics began. This radioisotope was Iodine-131 and it was used in thyroid investigations. Iodine-131 was also later used for treating hyperthyroidism and thyroid cancer. After the success of using this radioisotope, other radioactive isotopes became accessible (Keevil).
This is the first reaction in the Harcourt Essen experiment. The iodine is oxidised to produce I2 wh...
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