周报高三HZ 27期2022答案

第二节书面表达Dear Henry,Im Li Hua from your English speaking class lastterm. I m writing to ask for your helpNow I am preparing to attend MUN next weckHowever,have some difficulty with concepts andexpressions of the current affairs and speech skills. Iwonder if I can borrow your Dictionary of englishMedia. which you presented in class. Furthermore.I amnot quite sure about how to make a convincing andpersuasive speech at MUN. Could you be so kind as to giveme some advice?I know you have a very busy schedule, but I'd be verygrateful if you could spare some time to give me face-to-acc instructions. Thank you for your kindnessI'm looking forward to your replyYoursLi Hua

26.(共14分,除标注外,每空2分)(1)+2(1分)2AH+2OH+2H2O=2AIO2+3H2↑(2)溶解 LiFePO,将Fe2全部氧化为Fe3+炭黑(1分)2Li+CO32=LiCO3(3)①2.5②H2PO学H+HPO,HPOH+PO,CO结合H使c(Ht)减小,促进电离平衡正向移动,c(PO3)增大,与Fe结合形成磷酸铁沉淀(4)控制溶液的pH,且使PO过量有利于析出rePO4,避免Fe3以其他形式沉淀,提高FePO4的纯度

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