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（7分）中安在线2011年2月15日报道，安徽滁洲正在以石英资源为基础，打造培育千亿元硅产业。石英的主要成分为二氧化硅，它是玻璃工业和陶瓷工业的原料，冶金工业的助熔剂。

（1）二氧化硅的结构与金刚石相似，都是由        （填“分子”、“原子”、或“离子”）构成的，二氧化硅属于              （填“酸”、“碱”、“盐”或“氧化物”）。

（2）装有氢氧化钠溶液的试剂瓶不能用玻璃塞，原因是在常温下，NaOH与玻璃塞中的SiO2缓慢地发生反应生成Na2SiO3和H2O。Na2SiO3使瓶口与瓶塞粘合在一起，则该反应的化学方程式为                                                 。

（3）硅是太阳能电池和电脑芯片不可缺少的材料。生产高纯硅的流程示意图如下：

① 制备粗硅的反应为：SiO2 + 2C Si + 2CO↑，反应的基本类型是        

② 整个制备过程必须达到无水无氧，若在H2还原SiHCl3过程中混入O2，可能引起的后果是                                    。

③ 为了达到绿色化学和节约资源的目的，物质A需要循环使用，A的化学式是     

答案

（7分）（1）原子 氧化物  （2）2NaOH + SiO2 = Na2SiO3 + H2O

（3）置换反应    硅被氧化得不到高纯硅，且发生爆炸    HCl

分析：（1）掌握氧化物的概念：由两种元素组成，一种为氧元素；

（2）了解装有氢氧化钠溶液的试剂瓶不能用玻璃塞的原因；

（3）①制备粗硅的反应为：SiO2 + 2C Si + 2CO↑符合“单换单”，为置换反应；

②考虑氢气与氧气可能爆炸，则整个制备过程必须达到无水无氧；

③由生产高纯硅的流程示意图可知，盐酸既是反应物，又是生成物．

解答：解：（1）二氧化硅的结构与金刚石相似，都是由原子构成的，二氧化硅属于氧化物．

（2）装有氢氧化钠溶液的试剂瓶不能用玻璃塞，原因是在常温下，NaOH与玻璃塞中的SiO2缓慢地发生反应生成Na2SiO3和H2O．Na2SiO3使瓶口与瓶塞粘合在一起，则该反应的化学方程式为2NaOH+SiO2=Na2SiO3+H2O．

（3）硅是太阳能电池和电脑芯片不可缺少的材料．生产高纯硅的流程示意图如下：

①制备粗硅的反应为：SiO2 + 2C Si + 2CO↑此费用符合“单换单”的特点，故反应的基本类型是置换反应；

②整个制备过程必须达到无水无氧，若在H2还原SiHCl3过程中混入O2，因为氢气不纯，可能爆炸；故可能引起的后果是硅被氧化得不到高纯硅，且发生爆炸．

③由生产高纯硅的流程示意图可知，为了达到绿色化学和节约资源的目的，物质A需要循环使用，A的化学式是HCl．

故答为：（1）原子；氧化物；

（2）2NaOH+SiO2=Na2SiO3+H2O；

（3）①置换反应；②硅被氧化得不到高纯硅，且发生爆炸；③HCl

点评：了解分子、原子、离子、元素与物质之间的关系；掌握氧化物的概念、反应类型的判定方法；掌握质量守恒定律的内容及其应用．

选择题

     Joe        Jim may go with you because one of them must clean the room at home.

A．Not; but

B．All; or

C．From; to

D．Either; or
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阅读理解

     Directions: Read the following passage. Fill in the numbered blanks by using the information from

the passage.

     Write NO MORE THAN THREE WORDS for each answer.

     Maybe you are an average student. You probably think you will never be a top student. This is not necessary so, however. Anyone can become a better student if he or she wants to. Here's how:

       1. Plan your time carefully. When you plan your week, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First your time for eating, sleeping, dressing, etc. then decide a good, regular time for studying. Don't forget to set aside enough time for entertainment. A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time.

     2. Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to study, concentrate on the subject.

      3. Make good use of your time in class. Take advantage of class time to listen to everything the teachers say. Really listening in class means less work later. Taking notes will help you remember what the teacher says.

     4. Study regularly. When you get home from school, go over your notes. Review the important points that your teacher mentioned in class. If you know what your teacher is going to discuss the next day, read that material will become more meaningful, and you will remember it longer.

       5. Develop a good attitude about tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won't end if you don't pass a test, so don't be overly worried. There are other methods that might help you with your studying. You will probably discover many others after you have tried these.

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