问题 填空题

(20分)

(I)多项选择题(6分)

CH3、CH3-、CH3都是重要的有机反应中间体,有关它们的说法正确的是     

A.它们均由甲烷去掉一个氢原子所得

B.它们互为等电子体,碳原子均采取sp2杂化

C.CH3与NH3、H3O+互为等电子体,几何构型均为三角锥形

D.CH3中的碳原子采取sp2杂化,所有原子均共面E.两个CH3-或一个CH3和CH3结合均可得到CH3CH3

(II)(14分)

锌是一种重要的金属,锌及其化合物有着广泛的应用。

(1)指出锌在周期表中的位置:    周期,     族,      区。

(2)葡萄糖酸锌[CH2OH(CHOH)4COO]2Zn是目前市场上流行的补锌剂。写出Zn2+基态电子排布式                 ;葡萄糖分子中碳原子杂化方式有             

(3)Zn2+能与NH3形成配离子[Zn(NH3)4]2+。配位体NH3分子属于         (填“极性分子”或“非极性分子”);在[Zn(NH3)4]2+中,Zn2+位于正四面体中心,N位于正四面体的顶点,试在左下图中表示[Zn(NH3)4]2+中Zn2+与N之间的化学键。

(4)右上图表示锌与某非金属元素X形成的化合物晶胞,其中Zn和X通过共价键结合,该化合物的化学式为       ;该化合物的晶体熔点比干冰高得多,原因是                

答案

(I)(6分)CDE

(II)(14分)

(1)(3分)四, ⅡB,  ds

(2)(4分)1s22s22p63s23p63d10­或[Ar] 3d10­;sp2、sp3

(3)(3分)极性分子

(4)(4分)ZnX  该化合物是原子晶体,而干冰是分子晶体。

完形填空

阅读短文,按照题目要求用英语回答问题。(请注意问题后的词数要求)

My name is Clara. I still remember that chilly December day, sitting in science class. I’d finished a worksheet early and picked up a TIME for Kids magazine. A piece of news caught my eye: NASA was holding an essay contest to name its Mars rover(火星探测器).Before I even knew anything else about it, a single word flooded my 11-year-old mind, Curiosity.

I couldn’t want for the bell to ring so I could get started on my essay. That afternoon, I raced home, sat down at the computer, and typed until my fingers ached. “Curiosity is an everlasting flame that burns in everyone’s mind...”

Five months later, my mom received a phone call, and immediately, a wide smile spread across her face.

On August 5,2012,at 10:31 p.m, the rover named Curiosity touched down safely on the surface of Mars, and I was honored to have a front-row seat in NASA.

Curiosity is such an important part of who I am. I have always been fascinated by the stars, the planets, the sky and the universe. I remember as a little girl, my grandmother and I would sit together in the backyard for hours. She’d tell me stories and point out the stars, Grandma lived in China, thousands of miles away from my home in Kansas, but the stars kept us together even when we were apart. They were always there, yet there was so much I didn’t know about them. That’s what I love so much about space.

People often ask me why we go to faraway places like Mares. My answer is simple because we’re curious. We human beings do not just hole up in one place. We are constantly wondering and trying to find out what’s over the hill and beyond the horizon.

小题1:How did Clara get the new about the essay contest?( no more than 10 words)

小题2:Why did Clara have a front-row seat in NASA?( no more than 10 words)

小题3:What does Clara remember about the time spent with Grandma?( no more than 15 words)

小题4:What does the underlined phrase “hole up”mean?(1 word)

小题5:In your opinion, why is curiosity important?( no more than 20 words)

判断题