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24 PbO 2 → 2 Pb 12 O 19 + 5 O 2 Pb 12 O 19 → Pb 12 O 17 + O 2 2 Pb 12 O 17 → 8 Pb 3 O 4 + O 2 2 Pb 3 O 4 → 6 PbO + O 2. The stoichiometry of the end product can be controlled by changing the temperature – for example, in the above reaction, the first step occurs at 290 °C, second at 350 °C, third at 375 °C and fourth at 600 °C.
Pb 12 O 19, monoclinic, dark-brown or black crystals The so-called black lead oxide , which is a mixture of PbO and fine-powdered Pb metal and used in the production of lead–acid batteries . Index of chemical compounds with the same name
Lead(II) oxide, also called lead monoxide, is the inorganic compound with the molecular formula Pb O.PbO occurs in two polymorphs: litharge having a tetragonal crystal structure, and massicot having an orthorhombic crystal structure.
[83] [84] [85] The same applies for lead(I), which can be found in such radical species. [86] Numerous mixed lead(II,IV) oxides are known. When PbO 2 is heated in air, it becomes Pb 12 O 19 at 293 °C, Pb 12 O 17 at 351 °C, Pb 3 O 4 at 374 °C, and finally PbO at 605 °C.
Lead(II,IV) oxide, also called red lead or minium, is the inorganic compound with the formula Pb 3 O 4.A bright red or orange solid, it is used as pigment, in the manufacture of batteries, and rustproof primer paints.
The names "caffeine" and "3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione" both signify the same chemical compound. The systematic name encodes the structure and composition of the caffeine molecule in some detail, and provides an unambiguous reference to this compound, whereas the name "caffeine" simply names it.
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118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).