[题目]化学专业英语-|||-4、With the exception of boron,group mA ele-|||-ments are also fairly reactive metals.Alumin-|||-um appears to be inert toward reaction with ai-|||-r,but this behavior stems from the fact that-|||-the metal forms a thin, invisible film of alu-|||-minum oride on the surface, which protects th-|||-e bulk of the metal from further ozidation.T-|||-he metals of group IlA form ions of +3 char-|||-ge.Group ⅢB consists of the metals scandiu-|||-m,ytrrium,lanthanum,and actinium.-|||-Group IAA consists of a nonmetal,carbon, tw-|||-o metalloids, silicon and germanium, and tuo-|||-metals, tin and lead. Each of these elements-|||-forms some compounds with formulas which .-|||-ndicate that four other atoms are present per-|||-group IAA atom,as, for example,carbon tetra-|||-chloride,CCl4.T he group IVB metals-titaniu-|||-m,zirconium,and a fnium-also form compou-|||-nds in which each group IVB atoms is combin-|||-ed with four other atoms; these compounds ar-|||-e non-electrolyes when pure.-|||-5、Fit a dry,200-ml.Round bottomed flask w-|||-ith a dry,water-cooled .A drying tube filled w-|||-ith calcium chloride is attached to the top of t-|||-he condenser, In the flask place 2.4g(0,10mo-|||-l) of dry magnesium turnings,a crystal of io-|||-dine,30 ml.of anhydrous ether,and 10 ml(1-|||-5.7g,0.10mole)of anhydrous bromobenzene zene,If reaction does not start immediately,-|||-warm the flask on the steam bath so that the-|||-ether refluzes gently and then remove the bat-|||-h,T his will usually initiate the reaction, T he-|||-disappearance of the iodine color,the productio-|||-n of a cloudiness in the solution, and gentle-|||-boiling of the ether are all indications that th-|||-e reaction has begun it will process of its oucn-|||-accord causing the ether to boil gently 35-40-|||-minutes.-|||-6、Green chemistry has been developed extensi-|||-vely in the methodology of the modern organic-|||-simthesis. T he encironment benignity and the-|||-high efficiency are two important factors for-|||-craluating the reactions in the green chemistr-|||-y.The inerpensice,readily avail and non=-|||-toric iron salts,which are pre preferential in the-|||-green chemistry, have been applied to the oxid-|||-ation and the C-C bond formation recently. M-|||-eanwhile the solvent free techniques possess se-|||-teral advantages as the non-classical methods-|||-which can reduce the volume of the reaction s-|||-ystem, enhance the efficiency of the readion,-|||-and mimizize the formation of the other wast-|||-e.The substitutions of the alcohols with nuc-|||-cophiles catalyzed by Lewis acids under neutra-|||-l conditions become the popular topic in these-|||-years because of atom-cconomy,comparing wit-|||-h the corresponding halids,esters and carbona-|||-tes.-|||-请不要用翻译工具翻译,谢谢!如果正确我会加