Copper

Reddish brown metal; face-centered cubic crystal; density 8.92 g/cm3; Mohs hardness 2.5 to 3.0; Brinnel hardness 43 (annealed); electrical resistivity 1.71 microhm-cm at 25°C; Poisson's ratio 0.33; melts at 1,083°C; vaporizes at 2,567°C; insoluble in water; dissolves in nitric acid and hot sulfuric acid; slightly soluble in hydrochloric acid; also soluble in ammonium hydroxide, ammonium carbonate and potassium cyanide solutions. Copper is a reddish-brown metal which occurs free or in ores, su

It is a material used in the electronics industry and used as a high-purity analytical reagent. Used in powder metallurgy parts, diamond saw blades, friction materials, electric carbon products and chemical catalysts, etc.; used as analytical reagents, catalysts, and reducing agents; used as ordinary reagents, catalysts and reducing agents; mainly used as raw materials in the copper smelting industry Used as a raw material for smelting and electrolytic copper; mainly used to make conductive equipment and alloys (bronze, brass, cupronickel, etc.); used as a reducing agent for teaching reagents; copper salt preparation; catalyst (powder); alloy; electroplating; reagent , Alloy, electroplating.