文档介绍：化学培优(八)化合价的应用1、下列有关化合价的说法中,正确的是······················( ),***元素均为-,氢元素显+,,一定显负价2、下列关于化合价的叙述中正确的是·······················( ),,,各元素化合价的代数和为零3、下列说法正确的是·······························( ),、下列说法不正确的是·····························( ),,、(2005•自贡)酸根阴离子RO42-中R的化合价是·················( )A.-.+4D.+66、(2013•泰安)下列有关化合价的叙述正确的是·················( )(NH3)中氮元素的化合价为+-、(2012•上海)含有+2价氮元素的物质是····················( )、钛铁矿主要成分的化学式为FeTiOx,其中铁元素和钛元素的化合价均显+······································( )、(2010•南充)超导材料为具有零电阻及反磁性的物质,以Y2O3、BaCO3和CuO为原料经研磨烧结可合成一种高温超导物质Y2Ba4Cu6Ox,假设在研磨烧结过程中各元素的化合价无变化,则x的值为···································( )、(2006•重庆)KAl(SO4)m可作净水剂,m的值是················( )、(2013•永州)下列含硫化合物中,硫元素的化合价为+4价的是··········( )、(2013•衡阳)高铁酸钠(Na2FeO4)是一种新型净水剂,杀菌消毒效果均优于目前使用的***·······················( )A.+4B.+5C.+6D.+713、(2013•重庆)N2O和NO2是氮的氧化物家庭中的两名成员.(1)N2O中氮元素的化合价是,NO2中氮元素的质量分数是.(2)常温下,N2O是无色气体,NO2是红棕色气体,以上描述了两种物质的(填“物理”或“化学”)性质.(3)工业生产中,用N2O与氨基化钾(KNH2)反应制备叠氮化钾(KN3),其化学方程式为N2O+2KNH2=