2022英语周报试题答案

第二节One possible versionI heard the footsteps and the light tap on the door. Mylegs trembling and tears streaming down, I hid myself behindBrother Lu. Mom walked in first, hugged him and then looked atme with a weak smile. Her eyes were swollen from crying. Andthen Dad was there. without even shaking hands with BrotherLu, he came straight to me and gathered me up into his strongarmsHolding me close, he whispered, I love you foreverThen he pulled back and looked at me with love and pride. "T'mterribly sorry, Daddy. I love you so much, I said thankfully.I know. Let's go home. " Just then, all my fear was gone. I realizedthat I was still Daddys little girl. And i was convinced that thoughthere would probably be unimaginable difficulties and pains thatlay ahead of me, I could get them over because I had a strong andloving family that would always be there for me

17.(13分,除标注外,每空1分)(1)Cr3d‘4s(2)配位键氢键(3)<(4)正四面体形sp3CCl4(SiF等,答案合理即可)Po(CO4等,答案合理即可)(5)①Fe2N25%②,239×10(2分)【解析】本题考查物质结构与性质,涉及价电子排布式、作用力类型判断、第一电离能比较、晶胞计算等。(1)与Fe同周期,即为第四周期,第四周期元素中,当元素基态原子价电子排布式为3d4s,且轨道处于半充满稳定状态时,含有的未成对电子数最多,即价电子排布式为3d4s4,元素为24号元素Cr(2)中心离子Fe提供接受孤电子对的“空轨道”,H2O中的o原子提供孤电子对,形成配位键。三环氮杂冠醚分子中的4个N原子与NH:中4个N一H键形成4个氢键(N一H…N),故两者之间的作用力为氢键。(3)根据Fe和Mn基态原子失去两个电子后的价电子排布式,比较第三电离能的大小Fe2的价电子排布式为3d,而Mn的价电子排布式为3d,3d轨道处于半充满的相对稳定状态,故l3(Fe)

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