2022英语周报新目标32答案

27.(1)物理变化(1分)(2)不能(1分);zrSO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)(3)ZrSO4+4Cl2+4C=ZrCl4+SiCl4+4CO(写“ZnSO4+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AgNO3溶液,若无沉淀产生,则已洗涤干净(或其他合理答案,2分)(5)2C1-2e=Cl2↑(2分);9.1g(2分)(6)7.7(2分)【解析】本题主要考査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ZrF3+4e—Zr+6F,每转移0.4mole,生成0. 1 mol zr,故阴极增重9.1g。(6)在Zr(CO2)2饱和溶液中:Zr(CO3)2、Zr4++2CO),设电离出的c(Zr1+)=amol·L-1,c(CO-)=2amol·L1,K[Zr(CO3)2]=c(Zr4)·c2(CO)=4a3=4.0×10-12,a=104,pc(Zr4+)=4,pc(CO))=3.7,pc(Zr+)+pc(CO))=7.7。

I looked at what the second man had dropped; it was jewellery. It all happened too quickly,but I soon realized what had happened. They were burglars. My friend Jeremy, who was waitingfor me, quickly ran out. when hearing unusual noises. We called the police and they were there 5minutes later. I gave the police officer descriptions of the thieves and told them the names theyhad called outYou were brave for trying stop them, "said the officer: We should be able to catch themwith your information. " Jeremy told the officer the owners of the house were on holiday and gavehim a phone number. When the officer left, I told Jeremy about the mistake with the doornumbers. I hadn, t really been brave at all, but my mix-up had stopped the burglars getting awaywith the jewelry. Jeremy's neighbor thanked me a lot when they came back. Actually I have been

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