题目

已知四种物质在水中、液氨中的溶解度〔g(溶质)/100 g(溶剂)〕如下表,这几种化合物在两溶剂中能发生复分解反应的为__________。 AgNO3Ba(NO3)2AgClBaCl2水1709.31.5×10-433.3液氨8697.20.80 答案:解析:离子反应总是向离子浓度减小的方向进行,在水溶液中是AgCl的溶解度最小,但在液氨中却是BaCl2的溶解度最小。答案:水中的复分解反应为:BaCl2+2AgNO3====Ba(NO3)2+2AgCl↓,液氨中复分解反应为:Ba(NO3)2+2AgCl====BaCl2↓+2AgNO3- Why didn’t Sally play the violin at the concert last night?- She said that her hand hurt,but that was only a(n) ____.I saw her play tennis just now.A.excuseB.matterC.resultD.expression
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