The Element: Chlorine

1183 WordsSep 29, 19995 Pages
The Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence number of 3. The element has 3 energy levels. Chlorine exists as a greenish-yellow gas at normal temperatures and pressures. Chlorine is second in reactivity only to fluorine among the halogen elements. Chlorine is a nonmetal. It is estimated that 0.045% of the earth's crust and 1.9% of sea water are chlorine. Chlorine combines with metals and nonmetals and organic materials to form hundreds of chlorine compounds. Chlorine is about 2.5 times as dense as air and moderately soluble in water, forming a pale yellowish green solution. Chlorine is so reactive…show more content…
If a colored, oxidizable material is present, hypochlorous acid releases its oxygen to oxidize the material to a colorless compound. Liquid bleach is usually an aqueous solution of sodium hypochlorite, and dry powder bleaches contain chloride of lime. Since chlorine destroys silk and wool, commercial hypochlorite bleaches should never be used on these fibers. Chlorine is also used as a disinfectant. The oxidizing ability of chloride of lime enables it to destroy bacteria; therefore large amounts are used to treat municipal water systems. This chemical is also used in swimming pools and for treating sewage. Chlorine is used as rock salt. Sodium chloride, NaCl, is used directly as mined (rock salt), or as found on the surface, or as brine also known as salt water. It can be dissolved, purified, and reprecipated or given in return for use in foods or when chemical purity is required. Its main uses are in the production of soda ash and chlorine products. The form uses it as refrigeration, dust, and ice control, food processing, and food preservation. Calcium chloride, CaCl2, is usually obtained from salt water or as a by product of chemical processing. Its main uses are road treatment, coal treatment, and concrete conditioning. In addition to these products, for which chlorine is needed, various other chlorine compounds play an important part in chemistry and the chemical industry. The
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