Hafnium
Hafnium is a lustrous, silvery, ductile metal. It restists corrosion due to formation of a tough, impenetrable oxide film on its surface. The metal is unaffected by alkalis and acids, except hydrofluoric acid. Hafnium is difficult to separate form its group 4 partner, zirconium, bacause the two elements have atoms that are the same size.
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Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment. Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, …
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Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a silvery-greyish appearance when oxidation is removed. It is the first element in group 12 of the periodic table. Symbol: Zn Atomic mass: 65,38 u Atomic number: 30 Electron configuration: [Ar] …
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Calcium carbide, also known as calcium acetylide, is a chemical compound with the chemical formula of CaC₂. Its main use industrially is in the production of acetylene and calcium cyanamide. Hazardous Wastes: Calcium carbide is a D003 reactive hazardous waste, since addition to water generates a regulated amount of flammable gas.
