2022英语周报八年级上册外研第3答案

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)

5.(16分)(1)自旋(1分)(2)1s2s2p°3s23p53d04s24p3(或[Ar]3404s24p3)(1分)Br、Kr(2分)(3)sp3(1分)(4)①2H3AsO3+3H2S=As2S+6H2O2分)②平面三角形(1分)③<(1分)HAsO可表示为(io)3As,非羟基氧的个数为0,HNO2可表示为(HO)NO,非羟基氧的个数为1,非羟基氧的个数越多,中心原子的正电性越高,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H3AsO3(2分)(5)① LiFeAs(1分)②(米,2)(2分)138×4NA×(0.53×10》(2分【解析】(1)量子力学把电子在原子核外的一种空间运动状态称为一个原子轨道,电子除空间运动状态外小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s22p53s23p53d4s24p3或[Ar]3d4s24p3;同周期元紊从左向右第一电离能呈增大趋势,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个a键,有1对孤电子对因此As的杂化轨道类型为sp(4)①雌黄的分子式为As2S3,则反应Ⅲ的化学方程式为2H3AsO3+3H2S=As2S3+6H2O。②SO2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。③H3AsO为三元弱酸,不含非羟基氧,HNO2中含有1个非羟基氧,非羟基氧越多,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H3AsO3。5)①根据晶胞的结构,Li位于晶胞内部,有4个,Fe位于顶点棱心、面心,个数为8x1+8×4+2=4,As位于晶胞内部有4个因此晶体的化学式2为 LiFeAs②根据1号和2号原子的坐标推出3号原子的坐标为(,,2)。个晶胞的质量为38×4g,晶胞的体积为(0.53×10-7)3cm2,则晶胞的密度为138×4NAX(0.53×10-7)8·cm-3

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