Columbia Encyclopedia

(Encyclopedia) copper sulfate, common name for the blue crystalline heptahydrate of cupric sulfate, in which copper has valence +2. It may also refer to cuprous sulfate (Cu2SO4), in which copper has valence +1. ...

(Encyclopedia) copper, metallic chemical element; symbol Cu [Lat. cuprum=copper]; at. no. 29; at. wt. 63.546; m.p. 1,083.4℃; b.p. 2,567℃; sp. gr. 8.96 at 20℃; valence +1 or +2. Copper and some of its alloys ha...

(Encyclopedia) copper pyrites: see chalcopyrite. ...

(Encyclopedia) Copper Age: see Bronze Age.

(Encyclopedia) Copper, river, c.300 mi (480 km) long, rising in the Wrangell Mts., SE Alaska, and flowing S through the Chugach Mts. to the Gulf of Alaska. Copper deposits near the upper river, long mined by natives...

(Encyclopedia) Periodic Table of the Elements: Copper ...

(Encyclopedia) gunmetal, a bronze, an alloy of copper, tin, and a small amount of zinc. Although originally used extensively for making guns (from which it received its name), it has been superseded by steel, and it...

(Encyclopedia) Heinze, Frederick Augustus hīnˈzē [key], 1869–1914, American copper magnate, b. Brooklyn, N.Y. He went in 1889 to Butte, Mont., as engineer for a mining company. In 1893 he organized the Montana ...

(Encyclopedia) leaching, method of extraction in which a solvent is passed through a mixture to remove some desired substance from it. A simple example is the passage of boiling water through ground coffee to dissol...

(Encyclopedia) pressure-treated wood, wood that has had a liquid preservative forced into it in order to protect against deterioration due to rot or insect attack. The most commonly used preservatives are chromated ...