英语周报 2018-2022 高三 课标 0答案

27.(1)t-BuOH+HNa.0℃t-BuNO2+H2O(2分)(2)①恒压滴液漏斗(滴液漏斗)(2分)②水浴加热(2分)③降低叠氮化钠的溶解度,防止产物损失(2分)(3)65%(2分)AC(2分)(4)CO-+2N+H2O=C1-+20H-+3N2↑(2分)解析:(1)根据元素组成以及酯化反应特点,有水分子生成,无机酸与醇的酯化反应生成亚硝酸酯与水,反应的化学方程式40℃为t-BuOH+HNO2→t-BuNO2+H2O;(2)①根据仪器的构造可知,装置a的名称是恒压滴液漏斗(滴液漏斗);②加热温度低于100℃,所以用水浴加热;③叠氯化钠易溶于水,溶于乙,低温下解度降低,用乙醇洗涤溶质损失更少(3)Ce+总计为0.10molL1×0.04L=0,004mol,分别与Fe+和N反应。其中与Fc2+按111反应消舰0.10molL1×0.02L=0.002mol,则与N换1:1反应也为0.002mol,即10mL所取液中有0.002molN,原2.0g叠化钠试样,配成100mL溶液中有0.02mol即1,3gNsN3,所以样品质量分数为65%误差分析:A.使用叠氯化钠崑液润洗锥形瓶,使进入锥形航中溶质比所取溶液更多,滴定消耗的硫酸亚铁铵标准液体积减小,叠氮化钠溶液浓度偏大;B.六璃酸钟铵溶液实际取量大于40.00mL,滴定消耗的硫酸亚铁铵标准液体积增大,计算叠氯化钠溶液浓度偏小;C.滴定前无气泡,终点时出现气池,则读数体积为实际寓液体积减气泡体积,硫酸亚铁铵标准液读数体积减小,叠氮化钠溶液浓度偏大;D滴定过程中,将挂在锥形瓶壁上的硫酸亚铁铵标准液滴用燕馏水冲进瓶内,无影响;(4)叠化钠有毒,可以使用次氯酸钠溶液对含有叠氯化钠的溶液进行销毁,反应后溶液硫性明显增强,且产生无色无味的无毒气体氮气,结合氧化还原反应配平,反应的离子方程式为Co-+2N+H2O=C-+2OH+3N2千

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

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