POLIMERS (190,00 руб.)

State to what parts of speech these words belong: frequently, chemical, consisting, compound, shortened, constituent, which, single, evaporation, mixture, intermetallic, slightly. <...> Chemical compound A chemical compound (frequently shortened to compound) is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. <...> Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms] that are held together in a defined spatial arrangement by chemical bonds. <...> Chemical compounds can be compound molecules held together by covalent bonds, salts held together by ionic bonds, metallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds. <...> Chemical compounds have a unique and defined chemical structure, don’they? 5. <...> Give Russian equivalents to the following English words, word combinations and chemical terms: covalent chemical bonds, extraordinary range of properties, synthetic materials, is based on, significant, such as, most commonly, glycosidic bonds, a phosphodiester bond, the list of synthetic polymers, neoprene, polystyrene, polyethylene, polypropylene, polyacrylonitrile, nylon, rubber. 2. <...> Guess the meaning of the words in black type: structure - structural, polymer – polymeric, connect – connected, react – reaction, wide – widely, differ – different differently Polymer A polymer is a large molecule (macromolecule) composed of repeating structural units typically connected by covalent chemical bonds. <...> Most commonly, as in this example, the continuously linked backbone of a polymer used for the preparation of plastics consists mainly of carbon atoms. <...> The list of synthetic polymers includes synthetic rubber, Bakelite, neoprene, nylon, PVC, polystyrene, polyethylene, polypropylene, polyacrylonitrile, PVB, silicone, and many more. <...> In DNA and RNA, the phosphodiester bond is the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon of another, deoxyribose in DNA and ribose in RNA. <...> A glycosidic bond is formed between the hemiacetal group of a saccharide (or a molecule derived from a saccharide) and the hydroxyl group of some organic compound such as an alcohol. <...> A second set of properties, known as microstructure, essentially describe the arrangement of these monomers within the polymer at the scale <...>