【书面表达2】What a mess! "April frowned. Though she had been longing for a non-Earth Daybirthday, it was difficult to turn a blind eye to such a mess. She turned around to her friends, " Howabout picking the trash first? "" Her proposal was quickly approved by others and soon they were inbusiness. Aprils mum grabbed some gloves from the trunk while her dad managed to removethose shopping bags in the trees. With the bags, April and Bailey collected scattered bottles. Bythe drain, Josie and Tyler made great efforts to clear the blockage Many hands make light workIn a short while, three bags were filled with cans and newspapers to recycleApril looked at the collected rubbish and smiled. Then she looked up at her friendsTheir neat clothes for the birthday party were soaked with sweat. but their faces glowed withsatisfaction. It felt so good to do something for the earth. Happy Earth Day, everyone, " said AprilNow we are ready for Maze Craze. ""Happy Birthday, April! "shouted her friends. "Im so luckyto have been born on Earth Day!("Wow, another earthy birthday, )April thought to herself."AComposts Carnival may be a good idea for next year.

27.(1)物理变化(1分)(2)不能(1分); Eric难溶于盐酸,后续依然需要用氯气和石油焦与锆英石反应,浪费药品(2分)高温高温(3) ErIc4+4Cl2+4C=ZrCl4+siCl4+40O(写“ZnSi4+4Cl2+2C-ZrCl4+SiCl4+2CO2”也给分,2分)(4)取少许最后一次的洗涤液于试管中,加入适量硝酸酸化的AgNO溶液,若无沉淀产生,则已洗涤干净(或其他合理答案,2分)(5)2C|--2e-Cl2↑(2分);9.1g(2分)(6)7.7(2分)【解析】本题主要考查制备海绵锆的工艺流程,考查学生对元素化合物的理解能力和综合运用能力。(2)硅酸盐难溶于酸,不能用盐酸来溶解锆英石。(5)阴极的反应式为ZrF-+4e-—Zr+6F-,每转移0.4moleˉ,生成0. 1 mol Zr,故阴极增重9.1g(6)在Zr(CO3)2饱和溶液中:Zr(CO)2Zr*++20O,设电离出的c(Zr4+)=amol·L-1,c(CO)2amol·L-1,K[Zr(CO)2]=c(Zr1+)·c2(CO)=4a3=4.0×10-12,a=10-4,pc(Zr+)=4,p(CO-)=3.7,px(Zr+)+p(CO-)=7.7。

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