【判断题】【消耗次数:1】
形成共价键的两个原子核之间距离称为键长。
正确
错误
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相关题目
【判断题】 共价键的极性判断就看形成共价键的两个原子是否相同,若相同,则为非极性共价键,若不同,则为极性共价键。
①  正确
②  错误
【判断题】 键能是由原子形成共价键所放出的能量,或共价键断裂成两个原子所吸收的能量。
①  正确
②  错误
【单选题】 原子键通过( )所形成的的化学键,称为共价键。
①  氢键
②  范德华力
③  共用电子对
④  阴阳离子
【判断题】 配合物的内界核外界之间主要以共价键相结合
①  正确
②  错误
【判断题】 决定共价键极性强弱的主要因素是成键原子间电负性差。
①  正确
②  错误
【判断题】 离解能:要使1molA-B双原子分子(气态)共价键解离为原子(气态)时所需要的能量也就是键能,或叫键的离解能。
①  正确
②  错误
【单选题】 下列物质中,既有离子键又有共价键的是
①  KCl
②  CO
③  Na2SO4
④  NH4+
【单选题】 MRI最常用的成像原子核是
①  氧原子核
②  氮原子核
③  氢原子核
④  钠原子核
⑤  碳原子核
【单选题】 苯分子中有6个碳碳键,碳碳键的键长之间的关系:( )。
①  5长1短
②  4长2短
③  一样长
④  3长3短
【判断题】 均裂:共价鍵断裂时,两个成鍵电子均匀地分配给两个成鍵原子或原子团,形成两个自由基。
①  正确
②  错误
随机题目
【单选题】 Were it not for the rainny weather, they______ all right.
①  would be
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③  would have been
④  were
【单选题】 OK, 1000 Yuan for one rug. That’s the ______!
①  dear
②  deal
③  trade
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【单选题】 Keeping eye contact ______ respect for the interviewer and your confidence.
①  says
②  pays
③  throws
④  shows
【单选题】 Seeing the enemy, the hero was behaving as though nothing______.
①  was happening
②  would happen
③  had happened
④  happened
【单选题】 __Why didn’t John call me ? __Oh, his cell-phone ran out of power, otherwise he______ you.
①  had called
②  would have called
③  called
④  would call
【单选题】 I enjoyed the movie very much. I wish I______ the book from which it was made.
①  have read
②  had read
③  should have read
④  are reading
【单选题】 Silveristhebestconductorofelectricity,copper_______itclosely.
①  followed
②  following
③  to follow
④  being followed
【单选题】 But for the party, the old man______of hunger fifteen years ago.
①  must die
②  must have died
③  would die
④  would have died
【单选题】 _____withthesizeofthewholeearth,thehighestmountaindoesnotseemhighatall.
①  When compared
②  Compare
③  While comparing
④  Comparing
【单选题】 Thats pretty good that you get up and go running, but I ______ like running early in the morning since I’ve got to prepare breakfast for my family.
①  have a good time
②  have a hard time
③  have time
④  have much time