Copper oxide CuO

Cupric oxide [Copper oxide (CuO)], 10 Cyclodecanone, 111 Cyclododecanone, 108 Cyclododecanone, 2,12-dibromo-, 107 1 -Cy cloheptene, 1 -bromo-7 -acety loxy-[2-Cyclohepten-l-ol, 2-bromo-, acetate], 34... 

In an oxygen-rich flame, and at temperatures above 1200 C, CuCl is unstable and will react to form CuO and CuOH. CuOH emits in the 525-555 nanometer region (green ) and substantial emission may overpower any blue effect that is also present. Copper oxide, CuO, emits a series of bands in the red region, and this reddish emission is often seen at the top of blue flames, where sufficient oxygen from the atmosphere is present to convert CuCl to CuO [111. 

Copper oxide (CuO), basic copper carbonate - CuCO 3 C u(OH) 2, and copper sulfate - available commercially as CuS0 5H2O - are... 

A common feature of all the new ceramic superconductors is that they are cuprates, that is, they are complex copper oxides. The structure of YBCO is given in Fig. 19.3, which also shows that it is related to the perovskite structure (Fig. 4.17). Synthesis of YBCO is remarkably easy appropriate amounts of dry yttrium oxide (Y203), copper oxide (CuO), and barium carbonate (BaC03) are ground together into a fine, well-mixed... 

It remains to be noted that, when there is no method available for ascertaining the formula weight or a compound, the simplest formula, based on chemical analysis and the use of symbol weighLs of the contained elements, is used, e g., ferric oxide, FejOj, ferroferric oxide, FejCXt, ferrous oxide, FeO, cupric oxide (black copper oxide), CuO. cuprous oxide (red copper oxide). CujO. The customary formula of water is H2O. which is correct ai temperatures above I00°C—actually, liquid water is mainly dihydrol (HjOh. 

Cupric Oxide or Black Copper Oxide, CuO, mw 79.54, blk cubic crysts (Paramelaconite, d 6.40) or blk triclinic crysts (Tenorite, d 6.45)>mP 1026° (decomp) insol in w sol in acids, KCN Amm chloride. Can be prepd by the ignition of cupric carbonate or nitrate (Refs 1-8)... 

The Dumas method of nitrogen determination consists of an oxidation method in which a mixture of coal and copper oxide (CuO) is heated in an inert atmosphere to produce carbon dioxide (C02), water (H20), and nitrogen (N2). The carbon dioxide is absorbed, the water condensed, and the nitrogen determined volumetrically. Although the Dumas method has been employed for many years, various modifications have been made to increase accuracy and precision. 

Chlorine from Hydrochloric Acid. Place about 0.5 gram each of manganese dioxide, lead dioxide, sodium dichromate, and potassium permanganate in separate test tubes. Add about 2 cc. of 6 N hydrochloric acid to each and test for chlorine by holding iodide-starch paper in the mouths of the tubes. Also after warming a very little observe the odor and color of the gas. Rinse out the tubes immediately at the sink under the hood. Compare the action of the oxides used above with that of copper oxide CuO and lead oxide PbO. 

As was mentioned in Chapter 2, attempts to reduce oxides in forming phosphate glues were reported in the early literature. For example, Fedorov et al. [1] used a mixture of copper oxide (CuO) and metallic copper and developed a phosphate bonding agent for metals, where metal copper must have acted as the reductant. They also cite formation of phosphate glues with Zr02 and with CaZr03 in combination with Ni, Cr, and Ti. 

Copper oxide, CuO, is an oxidant for the conversion of alcohols into aldehydes or ketones [349] and for the transformation of hydrazo compounds into azo compounds [350]. 

Second, the composition of these materials is difficult to determine. They usually contain barium, copper, lanthanum, yttrium, and oxygen. They often contain other elements. But they are not simple compounds, like copper oxide (CuO) or yttrium oxide (Y2O3). Instead, they are complex mixtures of the elements. 

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