2022 英语周报 七年级 高考 49答案

18.(14分)(1)自旋(1分)(2)1s2s2p53s23p33d4s24p3(或[Ar]3d4s24p3)(1分)Br、Kr(1分)(3)sp3(1分)(4)2H3AsO2+3H2S一AgS2+6HO(2分)②平面三角形(1分)③<(分)H3AsO3可表示为(HO);As,非羟基氧的个数为0,HNO2可表示为(HO)NO,非羟基氧个数为1,非羟基氧的个数越多,中心原子的正性越高,导致羟基氧中氧的电子向中心原子偏移,越易电离出氢离子,故HNO2的酸性强于H2AsO2分5)① LiFeS(1分)a2,30分)③N×(0.53×10(2分)【解析】(1)量子力学把电了在原子核外的一种空闻运动状态称为一个原子轨道,电子除空间运动状态外,还有一种运动状态称为自旋(2)基态As原子的核外电子排布式为1s2s22p3s23p3d"4s24p3或[Ar]3d4s34p2;同周期元素从左向右第一电离能是增大趋势,但As原子最外层3p能级为半充满的稳定状态,其第一电离能大于Se,故第一电离能大于As元素的是Br和Kr(3)根据雄黄的结构图可知,As原子形成3有1对孤电子对,因此As的杂化轨道类型为4)①雌黄的分子式为A81S,则反应Ⅲ的化学方程式为2H1AsO3+3H2SAsS+6HO②sO2中心原子S形成2个a键,孤电子对数为(6-2×2)=1,价层电子对数为3,因此SO2的VSEPR模型为平面三角形③H1AsO3为三元弱酸,不含非羟基氧,HNQ2中含有1个非羟基氧,非羟基氧懿多,中心原子的正电性越高,导致羟基中氧的电子向中心原子偏移,越容易电离出氢离子,故HNO2的酸性强于HAsO35)①根据晶胞的结构,L位于品胞内部,有4个Fe位于顶点、凌心、面心,个数为8x÷+8×+位于品胞内部,有4个,因此品体的化学式为 LiFeAs。②根据1号和2号原子的坐标推出3号原子的坐标为(2③一个品胞的质量为138×4g,品胞的体积为(.53×10-7)2cm3,则晶胞的密度为138X4NA×(0.53×10-7g·cm

Paragraph IJatin looked up and he saw the other boys rushingahead. Refusing to give up at this crucial point, Jatinclenched his teeth, jumped to his feet and ran as fast as hecould. Finally, he was the fourth one to dash across thefinish line. Jatin couldnt help sobbing at the thought ofletting his sister down. But much to his surprise, the run-ner who collided with him was disqualified for breaking therule and Jatin won the third prize. Jatin felt overjoyed andrelieved during the award ceremony, holding the shoesclose to his chestParagraph 2Filled writh pleasure, Jatin walked home in no timeHe could not wait to see his sister and share the good newsOn his arrival, Jatin found Neha was walking about outsidnervously and anxiously. " Neha, see what I have got foryou.Jatin said excitedly, taking the prize out of his bagwith his trembling hands. The instant Neha saw the shoesher face lit up. So thrilled was she that she threw herself atJatin."Thank you! Jatin. " Tears of joy welled up in theieyes as the brother and the sister hugged tightly together

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