学英语2021-2022学年高三课标(新高考)版第19期答案

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学英语2021-2022学年高三课标(新高考)版第19期答案

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35.【答案】(1)d(1分)3d(2分)(2)同周期元素从左到右第一电离能呈增大趋势,但是基态Mg原子的价电子排布式为3s2,为3s能级全充满,3p能级全空稳定结构,较难失去1个电子(2分)(3)三角锥形(1分)sp(1分)CCl4(或SiF,等,1分)(4)TiCl为分子晶体,NaCl为离子晶体(2分)(5)NaC(2分)259×10(3分)aN【关键能力】理解与瓣析、分析与推测能力【解题思路】(1)钛的原子序数为22,价电子排布式为3d4s2,故Ti位于元素周期表的d区:基态T2的价电子排布式为3d。(3)C10中心原子C1原子的价层电子对数为4,有1个孤电子对,空间构型为三角锥形,CO中心原子C1原子的价层电子对数为4,采取sp杂化,与C0,互为等电子体的分子有SiF4,SiCl、CCl、CBr.等。(4)TiCl,熔、沸点较低,符合分子晶体的熔、沸点特征,可知该物质为分子晶体,NaCl为离子晶体,故二者熔、沸点均相差较大。(5)1个晶胞中Na原子数为8×8+1=2,C原子数为12×乞=6,则品胞的化学式为Na0,。晶胞参数为apm,1个品胞的体积为(a×10-")3cm3,品体的密度为架×10g·cm3。

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Most of us senior 3 students may feel discouragedbecause A the great pressure of study. To relieve根据下文中的" the great pressure of study”可知,此处应用ecause of because是连词,后接句子them, I think the following tip will be helpful此处指代上文提到ip"建议"是可数名词,下文的" the great pressure表明作者提了不止一条建of study",故应用it议,故用tipsFirstly, shift our focus. Focus too much on ourFocusing此处为动名词短语作主语grades will make us more nervous. So we'd better ta.had better do sth,是固定用法,表示”最好做某事think about the progress we had made, which helpslave此处表示到现在为止已经完成的动作,应用现在完成时build our self-confidence. Secondly, take someexercise.It's known to all if all work and no playthatIt是形式主语,后面的从句是真正的主语,从句句意和成分完整,故用thatmakes Jack a dull boy We should get into a habit oftheget into the habit of"养成……的习惯"是固定用法doing sports as it will help us build our body up andfeel relaxing all over. Finally, sleep well. A goodrelaxe此处表示感到放松, relaxed"放松的", relaxing"使人放松的”nights sleep can make us recharge our batteries andstart over easyeasily此处修饰动词,表示”容易地”,故用副词 easily