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【简答题】
a 、 b 、 c 、 d 为四种由短周期元素构成的中性粒子,它们都有 14 个电子,且都是共价键形成的物质。回答下列问题: (1)a 是单原子组成, a 单质可用作半导体材料, a 原子核外电子排布式为 _________________ 。 (2)b 是双核化合物,常温下为无色无味气体。 b 的化学式为 ________ 。人一旦吸入 b 气体后,就易引起中毒,是因为 ____________________________________________________ 而中毒。 (3)c 是双核单质,写出其电子式: _______________________________________________ 。 c 分子中所含共价键的类型为 ____________( 填 “ 极性键 ” 或 “ 非极性键 ” ) 。 c 单质常温下性质稳定,不易起反应,原因是 ___________________________________________________ 。 (4)d 是四核化合物,其结构式为 _________________________________________________ ; d 分子内所含共价键有 ________ 个 σ 键, ________ 个 π 键; σ 键与 π 键的强度大小关系为 σ______( 填 “ > ”“ < ” 或 “ = ” )π ,原因是 ____________________________________ ________________________________________________________________________ 。 答案:请拍照上传
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参考答案：
举一反三
【单选题】Finish all the exercises of iExplore 2 in Unit 2 of U校园.
A.
Finished
B.
Unfinished
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【判断题】时间上最好不要用闪回
A.
正确
B.
错误
查看完整题目与答案
【单选题】The main purpose of the text from iExplore 2 is to ___________ .
A.
emphasize the importance of passion in choosing career paths
B.
suggest letting passion follow the choice in deciding on careers.
C.
point out the wrongness of "following your passion"
D.
/
查看完整题目与答案
【单选题】In the first year of college, the author of the text from iExplore 2 suffered from ______.
A.
A serous psychological problem
B.
A troubled interpersonal relationship
C.
A physical problem caused by a parasite
查看完整题目与答案
【单选题】What do you learn from the text of iExplore 2?
A.
The dragon is a national symbol in the West.
B.
Eastern dragons are valued and respected.
C.
Dragons are frightening monsters.
D.
Boats were built to honor dragons in China.
查看完整题目与答案
【简答题】From the text of iExplore 1 you have learned that the transition from high school to college is not easy. You may be confused about this new phase in your life. In the text of iExplore 2 the author li...
查看完整题目与答案
【单选题】In iExplore 2, the author conveys the idea that_____________ .
A.
It's better to travel in a place where few people go.
B.
Exploring the surrounding areas is more interesting than travelling far away.
C.
Every experience of travel has unique value wherever you go.
D.
/
查看完整题目与答案
【单选题】In the first year of college, the author of the text from iExplore 2 suffered from__________ .
A.
A serous psychological problem
B.
A troubled interpersonal relationship
C.
A physical problem caused by a parasite
D.
/
查看完整题目与答案
【判断题】在吸气状态不变的情况下,当机器的转速改变时,其性能曲线是会改变的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】At the very beginning the father in iExplore 2 planned to find________.
A.
his son's journey that was buried somewhere in the attic
B.
his own business journal of those days
C.
a photo of the love of his life
D.
/
查看完整题目与答案
相关题目：
【单选题】Finish all the exercises of iExplore 2 in Unit 2 of U校园.
A.
Finished
B.
Unfinished
查看完整题目与答案
【判断题】时间上最好不要用闪回
A.
正确
B.
错误
查看完整题目与答案
【单选题】The main purpose of the text from iExplore 2 is to ___________ .
A.
emphasize the importance of passion in choosing career paths
B.
suggest letting passion follow the choice in deciding on careers.
C.
point out the wrongness of "following your passion"
D.
/
查看完整题目与答案
【单选题】In the first year of college, the author of the text from iExplore 2 suffered from ______.
A.
A serous psychological problem
B.
A troubled interpersonal relationship
C.
A physical problem caused by a parasite
查看完整题目与答案
【单选题】What do you learn from the text of iExplore 2?
A.
The dragon is a national symbol in the West.
B.
Eastern dragons are valued and respected.
C.
Dragons are frightening monsters.
D.
Boats were built to honor dragons in China.
查看完整题目与答案
【简答题】From the text of iExplore 1 you have learned that the transition from high school to college is not easy. You may be confused about this new phase in your life. In the text of iExplore 2 the author li...
查看完整题目与答案
【单选题】In iExplore 2, the author conveys the idea that_____________ .
A.
It's better to travel in a place where few people go.
B.
Exploring the surrounding areas is more interesting than travelling far away.
C.
Every experience of travel has unique value wherever you go.
D.
/
查看完整题目与答案
【单选题】In the first year of college, the author of the text from iExplore 2 suffered from__________ .
A.
A serous psychological problem
B.
A troubled interpersonal relationship
C.
A physical problem caused by a parasite
D.
/
查看完整题目与答案
【判断题】在吸气状态不变的情况下,当机器的转速改变时,其性能曲线是会改变的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】At the very beginning the father in iExplore 2 planned to find________.
A.
his son's journey that was buried somewhere in the attic
B.
his own business journal of those days
C.
a photo of the love of his life
D.
/
查看完整题目与答案
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