Lead Reasearch essays

Lead Reasearch essays Electrochemical Equivalent: 3.865g/amp-hr Incompatibilities: Strong oxidizers, hydrogen peroxide, acids Valance Electron Potential (-eV): 24.2 Chemical reactions of the element lead The surface of metallic lead is protected by a thin layer of lead oxide, PbO. Only upon heating lead to 600-800C does lead react with oxygen in air to from lead oxide, PbO. Finely divided lead powder is a fire risk. The surface of metallic lead is protected by a thin layer of lead oxide, PbO. It does not react with water under normal conditions. Lead metal reacts vigorously with fluorine, F2, at room temperature and chlorine, Cl2, on warming to form the poisonous dihalides lead(II) fluoride, PbF2, and lead(II) chloride, PbCl2, respectively. The surface of metallic lead is protected by a thin layer of lead oxide, PbO. This renders the lead essentially insoluble in sulphuric acid, and so, in the past, a useful container of this acid. Lead reacts slowly with hydrochloric acid and nitric acid, HNO3. In the latter case, nitrogen oxides are formed together with lead(II) nitrate, Pb(NO3)2. Lead dissolves slowly in cold alkalis to form plumbites Boiling Point: 2013K 1740C 3164F Coefficient of lineal thermal expansion: Enthalpy of Atomization: 194.6 kJ/mole @ 25C Enthalpy of Vaporization: 179.4 kJ/mole Flammablity Class: Non-combustible solid (except as dust) Melting Point: 600.6K 327.6C 621.7F Pysical State (at 20C Vapor Pressure = 4.21E-07Pa@327.6C A. Ways in which lead enters the body Lead can be absorbed into the body by inhalation (breathing) and ingestion (eating). Lead is not absorbed through the skin. Inhalation of lead is considered the most important source of occupational exposure. When lead is scattered in the air as a dust or fume, it can be inhaled and absorbed through the lungs and upper respiratory tract. Lead can also enter the digestive system if...