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Transcript of Chlorine
Atomic Number: 17
Atomic Weight: 35.453
Standard State: it is gas at room temperature but can be found as both solid and liquid
Origin of name: from the Greek word "chloros" meaning "pale green".
Chlorine was discovered in 1774 by c, a Swedish chemist.
He discovered it through the reaction of the mineral pyrolusite with hydrochloric acid. Scheele thought the resulting gas contained oxygen, and did not realise that he had discovered a new element. In 1810 chlorine was rediscovered by Sir Humphry Davy who confined chlorine as a distinct element and named after from the Greek word for greenish yellow, chloros.
A presentation by Aimee Moroney-Plouffe
Exposure to small amounts of chlorine, even for a short time, can be deadly.
Chlorine is heavier than air. When released, it forms a poisonous blanket that drifts along with the wind.
Chlorine was used as a chemical weapon in World War I, first in 1915 by the German army and then by the Western Allies. It was not as ‘effective’ as had been hoped, because chlorine is easily detected by its strong smell. It is also water soluble, and so soldiers could protect themselves from the worst of its effects by breathing through damp cloths.
Earth’s oceans contain a large amount of chlorine. If this chlorine were released as a gas, its weight would be 5x greater than Earth’s total current atmosphere.
Chlorine is not only abundant in our oceans; it is the sixth most abundant element in Earth’s crust.
Uses of Chlorine
Used in the production of safe drinking water worldwide.
extensively used in the production of paper products, dye stuffs, textiles, petroleum products, medicines, antiseptics, insecticides, foodstuffs, solvents, paints, plastics, and many other consumer products
most chlorine is used in the manufacture of chlorinated cleaning compounds, pulp bleaching and disinfectants.
Used for chlorinating and cleaning pools
In WWI it was used as a weapon to kill soldiers in trenches
Commonly used as an antiseptic.
How Chlorine is extracted/formed
Chlorine isn't found in its raw form.
It's extracted from Brine (salt water) by Electrolysis. This method, the chloralkali process, industrialized in 1892, now provides essentially all industrial chlorine gas.
Chlorine can also be obtained from Earth's oceans salt, but it is found only as the chloride ion. 1.9% of the mass of seawater is in chloride ions
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Lenntech.com, (2014). Chlorine (Cl) - Chemical properties, Health and Environmental effects. [online] Available at: http://www.lenntech.com/periodic/elements/cl.htm [Accessed Jul. 2014].
Webelements.com, (2014). WebElements Periodic Table of the Elements | Chlorine | Essential information. [online] Available at: http://www.webelements.com/chlorine/ [Accessed Jul. 2014].
Wikipedia, (2014). Chlorine. [online] Available at: http://en.wikipedia.org/wiki/Chlorine [Accessed Jul. 2014].
Wikipedia, (2014). Chlorine. [online] Available at: http://schools-wikipedia.org/wp/c/Chlorine.htm [Accessed Jul. 2014].