Compounds formulas for

Why is potassium aluminium sulphate not soluble in benzene A compound M has the composition C = 50.0% H=12.5%o A1 = 37.5%. 0.360 g of M reacts with an excess of water to evolve 0.336 1 of gas N and leave a white gelatinous precipitate R. R dissolves in aqueous sodium hydroxide and in hydrochloric acid. 20 cm of N require 40 cm of oxygen for complete combustion, carbon dioxide and water being the only products. Identify compounds N and R, suggest a structural formula for M, and write an equation for the reaction of M with water. (All gas volumes were measured at s.t.p.)... 

Reference has already been made to the high melting point, boiling point and strength of transition metals, and this has been attributed to high valency electron-atom ratios. Transition metals quite readily form alloys with each other, and with non-transition metals in some of these alloys, definite intermetallic compounds appear (for example CuZn, CoZn3, Cu3,Sng, Ag5Al3) and in these the formulae correspond to certain definite electron-atom ratios. 

Wnte structural formulas for all the constitutionally isomenc compounds having the given molecular formula... 

Now write structural formulas for the remaining three isomers Be sure that each one IS a unique compound and not simply a different representation of one writ ten previously... 

Wnte a structural formula for each of the following compounds... 

Excluding compounds that contain methyl or ethyl groups write structural formulas for all the bicychc isomers of (a) CsHg and (b) CgHjo... 

The general molecular formula for an alkene is Cr,H2n Ethylene is C2H4 propene IS C3H6 Counting the carbons and hydrogens of the compound shown (CsHie) reveals that it too corresponds to CnH2n... 

Wnte structural formulas for all the alkene products that could reasonably be formed from each of the following compounds under the indicated reaction conditions Where more than one alkene is produced specify the one that is the major product... 

Write a structural formula for the compound formed on elec trophilic addition of sulfuric acid to cyclohexene (step 1 in the two step transfer mation shown in the preceding equation)... 

Write a structural formula for each of the following compounds (a) o Ethylanisole (b) m Chlorostyrene (c) p Nitroaniline... 

An important property of aromatic hydrocarbons is that they are much more stable and less reactive than other unsaturated compounds Ben zene for example does not react with many of the reagents that react rapidly with alkenes When reaction does take place substitution rather than addition is observed The Kekule formulas for benzene seem mcon sistent with its low reactivity and with the fact that all of the C—C bonds m benzene are the same length (140 pm)... 

Acridine is a heterocyclic aromatic compound obtained from coal tar that is used in the syn thesis of dyes The molecular formula of acndine is C13H9N and its ring system is analogous to that of anthracene except that one CH group has been replaced by N The two most stable reso nance structures of acridine are equivalent to each other and both contain a pyndine like struc tural unit Wnte a structural formula for acridine... 

The mam components of a skunks scent fluid are 3 methyl 1 butanethiol and as- and trans-2 butene 1 thiol Write structural formulas for each of these compounds... 

Complete the following senes of equations by wnting structural formulas for compounds A through I... 

Many naturally occurring nitrogen compounds and many nitrogen containing drugs are bet ter known by common names than by their systematic names A few of these follow Wnte a struc tural formula for each one... 

The compound shown is a somewhat stronger base than ammonia Which nitrogen do you think IS protonated when it is treated with an acid" Write a structural formula for the species that results... 

The D arabinose analog of adenosine is an anitiviral agent (vidarabine) used to treat con junctivitis and shingles Wnte a structural formula for this compound... 

Kekule structure (Section 112) Structural formula for an aro matic compound that satisfies the customary rules of bond mg and is usually characterized by a pattern of alternating single and double bonds There are two Kekule formula tions for benzene... 

Molecular Formula. For compounds consisting of discrete molecules, a formula in accordance with the correct molecular weight of the compound should be used. 

Moles H moles Cl 0.0150 Thus, the simplest, or empirical, formula for the compound is C5H2CI2. 

Formulas for polymeric compounds are for the repeat unit only and ignore the end groups. 

The isoprene unit exists extensively in nature. It is found in terpenes, camphors, diterpenes (eg, abietic acid), vitamins A and K, chlorophyll, and other compounds isolated from animal and plant materials. The correct stmctural formula for isoprene was first proposed in 1884 (7). 

Poly(vinyl acetate) emulsions can be made with a surfactant alone or with a protective coUoid alone, but the usual practice is to use a combination of the two. Normally, up to 3 wt % stabilizers may be included in the recipe, but when water sensitivity or tack of the wet film is desired, as in some adhesives, more may be included. The most commonly used surfactants are the anionic sulfates and sulfonates, but cationic emulsifiers and nonionics are also suitable. Indeed, some emulsion compounding formulas require the use of cationic or nonionic surfactants for stable formulations. The most commonly used protective coUoids are poly(vinyl alcohol) and hydroxyethyl cellulose, but there are many others, natural and synthetic, which are usable if not preferable for a given appHcation. 

The general formula for boric acid esters is B(OR)2. The lower molecular weight esters such as methyl, ethyl, and phenyl are most commonly referred to as methyl borate [121 -43-7] ethyl borate [130-46-9J, and phenyl borate [1095-03-0] respectively. Some of the most common boric acid esters used in industrial appHcations are Hsted in Table 1. The nomenclature in the boric acid ester series can be confusing. The lUPAC committee on boron chemistry has suggested using trialkoxy- and triaryloxyboranes (5) for compounds usually referred to as boric acid esters, trialkyl (or aryl) borates, trialkyl (or aryl) orthoborates, alkyl (or aryl) borates, alkyl (or aryl) orthoborates, and in the older Hterature as boron alkoxides and aryloxides. CycHc boric acid esters, which are trimeric derivatives of metaboric acid (HBO2), are known as boroxines (1). 

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). 

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