题目

用所给单词的适当形式填空 1．This term I began to enjoy ________（watch）English movies. 2．A car runs ________（fast）than a bus. 3．I don’t do well in English reading. I read very ________（slow）. 4．I didn’t understand Vera because she didn’t ________（pronunciation）some words clearly. 5．Our______ (friend) has lasted for years. 6．Reading aloud is good for your __________ (speak) English. 7．He’s poor at spelling. He made a lot of spelling m_________ in his writing. 8．I don’t know how I can i ____________  my reading speed. 9．He is good at gramma弱电解质的电离平衡、盐类的水解平衡和难溶物的溶解平衡均属于化学平衡。根据要求回答问題。(1)生活中明矾常作净水剂，其净水的原理是_____________(用离子方程式表示)。(2)常温下，取0.2 mol/L HCl溶液与0.2mol/L MOH溶液等体积混合，测得混合后溶液的pH=5。写出MOH的电离方程式：__________________。(3)0.1mol/L的NaHA溶液，测得溶液显碱性。则① 该溶液中 c(H2A)_______________c(A2-)(填“>”、“<”或“=”)② 作出上述判断的依据是_____________(用文字解释)。(4)含Cr2O72-的废水毒性较大，某工厂废水中含5.0×10-3 mol/L的Cr2O72-。为了使废水的排放达标，进行如下处理：绿矾为FeSO4• 7H2O。反应(I)中Cr2O72-与FeSO4的物质的量之比为___________。常温下若处理后的废水中c(Cr3+)=6.0×10-7mol/L，则处理后的废水的 pH=___________。{Ksp[Cr(OH)3]=6.0×10-31}