英语周报2021-2022学年高三第43期答案

读后縷写【参考范文】We made up our minds to save the nurse with him together.We were faced with falling rubble from time to time. The trappednurse was still alive. We focused our efforts on removing thebricks and the rubble that trapped her body. Once she was freethe doctor guided us through the remains safely. He kept a perfectly caim tone throughout, which smoothed me much. My hearleaped with joy as we successfully walked out of the building. Althe survivors' gratitude was profound and boundless.Later in the afternoon I had time to Look around, and satthe destroyeed building. My beautifui workplace now lay beyonrecognition. The only thing that remained was broken wallsmidst the dim dust. I felt a weignt on my chest as the sednswelled inside. The doctor stood beside me and said with a fsmile,"We should be happy for those who survived the eartquake."I smiled back as the wind danced around us, and Ilucky to be alive.

27.(除特殊标注外，每空2分，共14分)(1)固体不溶物和液体（写成固体和液体也给2分）(2)2Cu+4H+02一2Cu2*+2H20（方程式写对但未配平给1分)(3)①2Fe2+H202+2H—2Fe3+2H,0(方程式写对但未配平给1分)②3.2~7.0或3.2≤pH<7.0(写成3.2 (1分)(5)1.0×1015【解析】(1)实验室中过滤操作适用于分离固体不溶物和液体。(2)铜在硫酸溶液中通入空气时，铜被氧气氧化，发生的离子方程式为2Cu+4H+02=2Cu2++2H20。(3)①双氧水具有氧化性，能把亚铁离子氧化为铁离子，便于调节pH使F*沉淀后经过滤除去：发生的离子方程式为2Fe2+H2O2+2H—2Fe3++2H20。②加入氧化锌调节pH使FC3+沉淀后经过滤除去，由表格可知，要让FC3+完全沉淀的pH是≥3.2，而Cd2+不能沉淀，所以合适的pH范围为3.2至7.0之间。(4)电解时是电解硫酸铬，生成O2、镉和疏酸，类似惰性电极电解硫酸铜溶液，硫酸在废液中可以循环使用：Cd2+能放电生成镉单质，而同在溶液中的Zn2+却不能放电生成Zn单质，说明活泼性Zn大于Cd。(5）由题意，ZnS(s)三Zn2(aq)+s2(aq)，又已知Kp(ZnS)=1.0×1023,c(S2)=1×102mol/L,故c(Zn2=1.0×10"。处理后的废水中存在醋酸的电离平衡：CH,CO0H一CH,CO0+H,K(CH,C00HcCH,C00)cH=2.0x105,解得c(CH COOH)c(Hh=1×105mol/L,pH=5。

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