（9分）氮及其化合物在生活、生产和科技等方面有重要的应用。请_爱下问搜题

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问题填空题

（9分）氮及其化合物在生活、生产和科技等方面有重要的应用。请回答下列问题：

（1）氮元素基态原子的价电子排布式为　　　；

（2）在氮气分子中，氮原子之间存放着个σ键和个π键；

（3）N₂分子中氮氮键的键长（填“大于”、“小于”或“等于”）

F₂分子中氟氟键的键长；

（4）氮元素的氢化物——NH₃是一种易液化的气体，该气体易液化的原因

是　　　　　　　　　　　　　　　　。

（5）配合物[Cu(NH₃)₄]C1₂中含有4个配位键，若用2个N₂H₄代替其中2个NH₃，得到的配合物[Cu(NH₃)₂(N₂H₄)₂]C1₂中含有配位键的个数为。

答案

（1）略 2分

（2）1；2 2分

（3）小于 1分

（4）氨分子之间容易形成氢键，使其沸点升高而容易液化 2分

（5）4 2分

完形填空

完形填空。

Dear Sandy,
     My family and I __1__ in Nanjing, China. We are very happy. I am ___2__ student in No. 11 Middle School. Is
our school ___3___? No, it isn't very big, but it's very beautiful. There __4___ any swimming pools(游泳池) in it.
But our school ___5__ two basketball courts. There is a garden and many tall trees in our school. There are about
fifty __6__ in our school. I am in Class 2, Grade 1. My classroom is ___7___ the second floor in __8___ A. There
are twenty boys and twenty-five boys in my class. Miss Fang is our Chinese teacher. __9__ is a very good teacher.
We all like her very much.
     May(愿) you be   10  ! Hope(希望) to see you soon(尽快).
                                                                                                                                                                        Yours,
                                                                                                                                                                         Lily

(      )1. A.am
(      )2. A.a
(      )3. A.small
(      )4. A. is
(      )5. A.have
(      )6. A.class
(      )7. A.at
(      )8. A.building
(      )9. A.He
(      )10.A.thin

B.is
B.an
B.big
B.isn't
B.has
B.classs
B.in
B.Building
B.he
B.slim

C.are
C.the
C.beautiful
C.aren't
C.there's
C.classes
C.between
C.the building
C.She
C.happy

D.be
D./
D.pretty
D. are
D.there're
D.class's
D. on
D.the Building
D. she
D.sad

填空题

质量为m的物体从静止出发以的加速度竖直下降，则：物体的动能增加了，物体的重力势能减少了。