Chemical formulas condensed

Two-Dimensional Representation of Chemical Structures. The lUPAC standardization of organic nomenclature allows automatic translation of a chemical s name into its chemical stmcture, or, conversely, the naming of a compound based on its stmcture. The chemical formula for a compound can be translated into its stmcture once a set of semantic rules for representation are estabUshed (26). The semantic rules and their appHcation have been described (27,28). The inverse problem, generating correct names from chemical stmctures, has been addressed (28) and explored for the specific case of naming condensed benzenoid hydrocarbons (29,30). 

In a balanced chemical equation (commonly called a chemical equation ), the same number of atoms of each element appears on both sides of the equation, chemical equilibrium A dynamic equilibrium between reactants and products in a chemical reaction, chemical formula A collection of chemical symbols and subscripts that shows the composition of a substance. See also condensed structural formula empirical formula,- molecular formula structural formula. 

C21-0053. Three phosphate anions can condense to form a ring whose chemical formula Is P3 Og. Determine the Lewis structure and draw a ball-and-stick model of this anion. 

Amino acids of the general form, 1, are the monomeric molecules which are condensed to form the polypeptide chains of the fibrous and globular proteins. The naturally occurring molecules are the L-enantiomers, shown in 1 for chemical formulae see Fig. 19.1. D-amino acids can be synthesized and the individual L- or D-amino acids or the D,Lrracemates can be crystallized. All the common amino acids have been studied by neutron or X-ray crystal structure analysis (see Thble 14.1), in the anhydrous or hydrate forms, as hydrochlorides or hydrochloride hydrates. 

This method is useful for portraying chemical formulae in typescripts and manuscripts, as a lot of information is conveyed in a condensed manner. However, it suffers from the problem that it does not give a pictorial representation of the stereochemistry of the molecule. In order to overcome this deficiency, it is possible to include the appropriate Cahn-Ingold-Prelog prefix, namely R or S, to indicate diastereo details, or one of the cis, trans, ortho, meta or para prefixes to indicate geometrical details. ... 

Schiff base. A class of compounds derived by chemical reaction (condensation) of aldehydes or ketones with primary amines. The general formula is RR X=NR". 

Write condensed chemical formulas to represent the Lewis structures in parts (a) through (j) of problem 52. (For example, 2-propanol can he described as CH3CH(0H)CH3.)... 

The chemical synonyms and identification numbers for wood creosote, coal tar creosote, and coal tar are listed in Tables 4-1 through 4-3. Coal tar pitch is similar in composition to coal tar creosote and is not presented separately. Coal tar pitch volatiles are compounds given off from coal tar pitch when it is heated. The volatile component is not shown separately because it varies with the composition of the pitch. Creosotes and coal tars are complex mixtures of variable composition containing primarily condensed aromatic ring compounds (coal-derived substances) or phenols (wood creosote). Therefore, it is not possible to represent these materials with a single chemical formula and structure. The sources, chemical properties, and composition of coal tar creosote, coal tar pitch, and coal tar justify treating these materials as a whole. Wood creosote is discussed separately because it is different in nature, use, and risk. 

The prediction that the zero temperature density of condensed electrons should be proportional to />( 1 - p) is tested against experimental observations in Figure 6 where the hole concentration is estimated from the chemical formula. 

Just as an atom is the smallest part of an element, a single element is the smallest portion of a chemical compound that can be encountered. Chemical compounds are made up of two or more elements that have bonded covalently or ionically. Chemical compounds are represented by formulae, much like elements are represented by symbols. According to the Condensed Chemical Dictionary, a formula is a written representation, using symbols, of a chemical entity or relationship. There are three types of chemical formulae empirical, molecular, and structural. 

Polyamide resins are linear condensation polymers with a high degree of crystallinity with repeating amide (-CO-NH-) links in their molecular chain. The number of carbon atoms between the amide bonds in the main backbone designates the number after the prefix PA . There are, however, two distinct types of polyamides with the following chemical formulas [1] ... 

ABSTRACT. Based on the nomenclature report of the lUCr (1990) the concepts of isopointal, isoconfigurational, Isotypic and homeotypic structures are described and illustrated by several examples. The notation proposed In this report for the crystal - chemical formulae is also developed, including the symbologies for close packings which are not closest, and for the condensation process of the structural units. 

You should be able to draw chemical formulas that show all of the valence electrons in a molecule (Lewis structures), using lines for bonds and dots to show unshared electrons. You should be proficient in representing structures as dash structural formulas, condensed structural formulas, and bond-line structural formulas. In particular, the more quickly you become skilled at using and interpreting bondline formulas, the faster you will be able to process structural information in organic chemistry. You have also learned about resonance structures, the use of which wiU help us in understanding a variety of concepts in later chapters. 

Condensed structural formula (Section 1.7B) A chemical formula written using letters of the elemental symbols for the atoms involved, listed in sequence for the connections of the central chain of atoms and without showing the bonds between them. In organic compounds, all of the substituent atoms that are bonded to a given carbon atom are written immediately after the symbol for that carbon atom, then the next carbon atom in the chain is written, and so on. 

It is much easier to learn chemistry if one already knows some chemistry That is, in order to go into any detail on any chemical topic, it is extremely helpful to have some very rudimentary knowledge of chemistry as a whole. For example, a crucial part of chemistry is an understanding of the nature of chemical compounds, the chemical formulas used to describe them, and die chemical bonds that hold them together these are topics addressed in Chapter 4 of this book. However, to understand these concepts, it is very helpful to know some things about the chemical reactions by which chemical compounds are formed, as addressed in Chapter 5. To work around this problem. Chapter 1 provides a highly condensed, simplified, but meaningful overview of chemistry to give the reader the essential concepts and terms required to understand more advanced chemical materiaL... 

While most of noncellulosic membranes rely on the selectivity of glassy polymers such as polysulfone, the Ube Gas Separation System is based on poly-imide produced by condensation polymerization of biphenyltetracarboxylic di-anhydride and aromatic diamines. The chemical formula of the polymeric ma-... 

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