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关注:1262 2014-10-09 03:16

chemistry

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求翻译成中文:Lead is classified as a post-transition metal and is also a member of the carbon group. Massive lead forms a protective oxide layer, but finely powdered highly purified lead can ignite in air. Melted lead is oxidized in air to lead monoxide. All chalcogens oxidize lead upon heating.[15] Fluorine does not oxidize cold lead. Hot lead can be oxidized, but the formation of a protective halide layer lowers the intensity of the reaction above 100 °C (210 °F). The reaction with chlorine is similar: thanks to the chloride layer, lead persistence against chlorine surpasses that of copper or steel up to 300 °C (570 °F).[15] Water in the presence of oxygen attacks lead to start an accelerating reaction. The presence of carbonates or sulfates results in the formation of insoluble lead salts, which protect the metal from corrosion. So does carbon dioxide, as the insoluble lead carbonate is formed;
 
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