书面表达Dear sir or madamI am Li Hua, a middle school student from China who is crazy about differentcultures around the world. Recently, I learned on your official website that therell be a summer camp in my city. I'm writing to participate in it.First, having learned English for almost ten years, I can speak English flu-ently. Moreover, with the development of China, there are more and more young-sters who show great interest in Chinese culture and this is really a wonderfulportunity for us to communicate the different cultures with each other, I will he a-hle to learn from other cultures to broaden my horizons and spread Chinese cultureI hope I can he accepted as a member in your summer caLooking forward to your reply.RegardsLi H

23.(16分)(1)AgCI(2分)(2)aGcL+S2Ag2S+2C-(2分)Ag2S比AgC的溶解度小(2分)(3)①SO:(2分)②S(2分)(4)①O2(1分)②Ag2S的悬浊液(1分)③102、4NaCl、2S(2分)④O2将Ag2S氧化生成S时有Ag+游离出来,NaCl中大量的C与游离的Ag+结合成AgC沉淀,由于c(Ag+)减小,有利于③中反应平衡正向移动,B中最终出现乳白色沉淀(2分).【解析】(1)I中NaCl与AgNO3溶液混合发生反应Ag++C-AgCl↓,故白色沉淀是AgCl(2)向所得固液混合物中加入Na2S溶液,S2与Ag+生成Ag2S,使平衡AgCl(s)Ag+(aq)+Cl(aq)正向移动,最终白色沉淀变黑,该反应的离子方程式为2AgC+s2-Ag2S+2Cl-。沉淀转化的主要原因是Ag2S比AgC!的溶解度小。(3)①向X中滴加Ba(NO)2溶液产生白色沉淀,说明X中含有SO。②向Y中滴加K溶液,产生黄色沉淀说明白色沉淀Y为AgCl;可进一步确定乳白色沉淀中含有AgC1和单质S(4)①在MnO2作催化剂的条件下,H2O2发生分解反生成O2,即A中产生的气体是Q2②C中盛放的物质W是Ag2S的悬浊液③B中产生沉淀的反应为2Ag2S+O2+4NaCl+2H2O、4AgCl+2S4NaOH④O2将Ag2S氧化生成S时,有Ag+游离出来,NaC中大量的C-与游离的Ag+结合成AgC!沉淀。由于c(Ag+)减小,有利于③中反应平衡正向移动B中最终出现乳白色沉淀。

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