Formulas and key properties

Poly(vinyl chloride) as previously discussed in Sec. 10.3, Formulas and Key Properties of Plastic Materials, has the following structures ... 

An extensive new Section 10 is devoted to polymers, rubbers, fats, oils, and waxes. A discussion of polymers and rubbers is followed by the formulas and key properties of plastic materials. Eor each member and type of the plastic families there is a tabulation of their physical, electrical, mechanical, and thermal properties and characteristics. A similar treatment is accorded the various types of rubber materials. Chemical resistance and gas permeability constants are also given for rubbers and plastics. The section concludes with various constants of fats, oils, and waxes. 

Tetranuclear species are believed to play a key role in the growth of species of higher nuclearity, both for iron(III) and for mixed iron(II)/iron(III) systems. Assessment of the physical and chemical properties of aqueous solutions of Fe, Al, and Ga suggested that the tridecamer [Fe04 Fe(0H)2(H20) i2] — cf. the now well-established AI13 species of this formula—may be a component under certain conditions. ... 

In this chapter we explored many of the rudiments of chemistry, including how matter is described by its physical and chemical properties and denoted by elemental and chemical formulas. We saw how compounds are different from the elements from which they are formed and how mixtures can be separated by taking advantage of differences in the physical properties of the components. Also addressed was what a chemist means by pure and how matter can be classified as element, compound, or mixture. Lastly, we saw how elements are organized in the periodic table by their physical and chemical properties. /Jong the way, you were introduced to some of the most important key terms of chemistry. With an understanding of these fundamental concepts and of the language used to describe them, you are well equipped to continue your study of nature s submicroscopic realm. 

Crystalline silicon is the most widely used semiconductor material today, with a maiket share of above 90%. Because of its indirect electronic band structure, however, the material is not able to emit light effectively and therefore carmot be used for key applications like light-emitting diodes or lasers. Selected one- or two-dimensional silicon compounds like linear or branched polysilylenes [1] or layered structures like siloxene [2], however, possess a direct band gap and therefore exhibit intense visible photoluminescence. Siloxene, a solid-state polymer with a sheet-like layered structure and an empirical formula Si H (OH) , in particular, is considered as an alternative material for Si-based liuninescent devices. Detailed studies of stmctural and photophysical properties of the material, however, are strraigly impeded by its insolubility in organic solvents. 

An easy-to-use reference source for all scientists working with carbohydrates, the Dictionary of Carbohydrates with CD-ROM, Second Edition builds on the success of its previous edition by providing a substantially increased number of compounds. The presentation is sharpened by a careful review of existing entries. With 24,000 compounds, it represents a much enlarged and revised new edition of the dictionary first published in 1998. Each entry contains a wealth of information which includes names and synonyms, molecular formulae, chemical structures, accurate mass, UV spectra, extensive source data, physical properties, uses and key literature citations. 

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