2022英语周报七年级下册亲目标答案

第二节One possible version:I had made a fool of myself and every girl in the seventh grademust be laughing at me. The next day at school, when I wasn'tthe focus of every joke, I realized that Nicole could not have saidanything. Only then did i have time to think about how deep I hadhurt her definitely. As I knew, she was not an outgoing kind of girlHow hard must it have been for her to cross over to invite me. Butmy ridiculous reaction ruined everything. I couldnt help thinkingwhat I could do to make it up to her.With October came another dance. On stepping into thegym, I anxiously looked for Nicole. There she was, sitting in acorner, paying close attention to all the dancing couples. Takinga deep breath, i gathered courage to step forward. Lady, may Ihave the honor to dance with you? "I reached out my hand to her.We started to sway. We trusted each other. This time, everythingwent perfectly. This was my first dance, which led to my fullunderstanding of bravery, and most importantly, of dance

17.(14分)(1) deane(f(1分)平衡烧瓶和分液漏斗中的压强,便于浓盐酸滴下(2分)(2)16H++2MnO+10C--2Mn2++5Cl2↑+8H2O(2分)(3)氯化锌发生水解生成Zn(OH)2,Zn(OH)2受热分解生成ZnO(2分,其他合理答案也给分)(4)碱石灰(1分)吸收多余的氯气和HCl,防止污染空气;防止空气中的水蒸气进入装置A(2分)(5)①100mL容量瓶、胶头滴管(2分)680②—%(2分)【解析】(1)装置D制备氯气,进入装置A前,Cl2需要干燥,但Cl2中的HCl杂质不需要除掉,装置C用于处理尾气,故装置的连接顺序为 hecabe(f);装置D中橡皮管的作用为平衡烧瓶和分液漏斗中的压强,便于浓盐酸滴下(2)装置D中反应的离子方程式为16H++2MnO+10C-2Mn2++5Cl2↑+8H2O(3)气体中有水蒸气杂质时,会导致氯化锌发生水解生成Zn(OH)2,Zn(OH)2受热分解生成ZnO(4)碱石灰不仅可以吸收尾气,同时还能防止空气中的水蒸气进入装置A(5)①配制100 mL Zncl2溶液需要用到的玻璃仪器有量筒、烧杯、玻璃棒、100mL容量瓶、胶头滴管,②根据关系式:ZnCh2~Zn2+~EDTA可知,ag试样中n(ZnO2)=bmoL×12.50×10-3L.×100ml=25.00m0.05bmol氯化锌的质量分数为0.05mol×136g:mol-1×100%=-%

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