【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】 Mary, your dress is really beautiful. How is John?
①  Thank you very much
②  No, no, John is not bad
③  Thank you. He is fine
④  Don’t say that. It’s ugly. John is good
【单选题】 Excuse me, sir. Where is Dr. Brown’s office?
①  You can’t ask me
②  Pardon? I have no idea
③  Please don’t say so
④  Sorry I don’t know, but you can ask the man over there
【单选题】 a reading lamp on the table.
①  There is
②  There has
③  It is
④  It has
【单选题】 And what we got to __________ is a disgrace.
①  come up with
②  catch up with
③  put up with
④  keep up with
【单选题】 In no circumstance __________ .
①  smoking should be allowed on the campus
②  should smoking be allowed on the campus
③  should smoking allowed on the campus
④  should smoking allow on the campus
【单选题】 Do you mind if I join you?
①  I’m very happy to do so
②  Never mind
③  Please do
④  Oh, I can’t
【单选题】 Hi, Sam, I think you did a good jo@@
①  Thank you
②  Don’t mention it
③  Not at all
④  I did it quite badly
【单选题】 We are interested in the weather because it __________ us so directly --- what we wear, what we do, and even how we feel.
①  benefits
②  affects
③  guides
④  effects
【单选题】 If the whole program __________ beforehand, a great deal of time and money would have been lost.
①  was not planned
②  were not planned
③  would not be planned
④  had not been planned
【单选题】 She’s an only child, but they didn’t really __________ her.
①  hurt
②  damage
③  spoil
④  harm