CuO Physicochemical data of CuO oxide: Copper(II) oxide. Copper(II) oxide powder TU 6-09-02-391-85 Warranty storage period of the oxide is 3 years. The main copper (divalent) oxide is copper oxide. The chemical formula of the oxide is CuO. Copper(II) oxide physically appears as black crystals, which have high structural stability and therefore are practically insoluble in water. Copper(II) oxide is hygroscopic. This substance is found in tenorite, a mineral that is quite common in nature. This substance is extracted by calcining copper hydroxocarbonate. Cu(NO3)2 – nitrate is also suitable for these purposes. Copper(II) oxide has pronounced oxidizing properties. Under the influence of the oxide, carbon present in one or another organic compound is converted into carbon dioxide. As for hydrogen, it is converted into water. This process is carried out by heating the substance and subsequent oxidation. The oxide itself is reduced in the form of metallic copper. This reaction is one of the most common for conducting elemental analysis related to determining the presence of hydrogen and carbon in organic material. A soft metal, ideally suited for forging, known as Cuprum, was widely used several centuries ago. Being among the seven most common metals worldwide, Cu has a pink tint that can be diluted with a brown color. Possessing high density, copper is a metal that is a very good conductor not only of electricity, but also, importantly, of heat. In this component, it is second only to silver, while being more accessible. Due to the softness of the substance, it is easy to make wire or very thin sheet metal. A distinctive feature of Cu is its low chemical activity. Air practically does not affect this metal in any way. Oxygen, as well as hydrogen and carbon, do not interact with copper, despite the high temperature. Nevertheless, Cu actively enters into chemical reactions with other substances. This metal does not interact with various acids that do not have oxidizing ability, however, if oxygen is present in the reaction, Cu can dissolve in them, forming salts.