问题 填空题

金属镁主要由电解熔融MgCl2的方法制得的.海水中溶有少量氯化镁,海边又盛产贝壳(主要成分是CaCO3)以它们为主要原料生产镁的大致程序是:

海水→Mg(OH)2

盐酸
 MgCl2溶液

无水MgCl2

电解
熔融
Mg+Cl2

(1)写出以海水和贝壳为原料制取Mg(OH)2所涉及到的化学方程式:______.

(2)电解MgCl2产物之一的Cl2可与空气、甲烷起反应(产物为HCl、CO)再制得盐酸,循环使用.写出该反应的化学方程式______.

答案

(1)先将贝壳高温煅烧生成氧化钙,然后将生石灰溶于水和氯化镁反应生成氢氧化镁,反应的化学方程式为:CaCO3

 高温 
.
 
CaO+CO2↑、CaO+H20═Ca(OH)2、Ca(OH)2+MgCl2═CaCl2+Mg(0H)2↓;

(2)根据反应物为氯气、甲烷和氧气生成氯化氢和一氧化碳可知,反应的化学方程式为:4Cl2+O2+2CH4═8HCl+2CO.

故答案为:(1)CaCO3

 高温 
.
 
CaO+CO2↑、CaO+H20═Ca(OH)2、Ca(OH)2+MgCl2═CaCl2+Mg(0H)2↓;

    (2)4Cl2+O2+2CH4═8HCl+2CO.

判断题
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阅读理解

                                                    Interview with a president

     While many teenagers may dream of meeting with pop star Jay Chou or NBA hero Yao Ming, Li Jing

had a far more powerful person on her mind. The Senior 2 from Beijing No.35 High School dreamt of

meeting Russian President Vladimir Putin.

     After more than a year of hard work and with a little good luck, Li fulfilled her dream. On October

11, 2004, the 16-year-old girl joined a team of Chinese journalists who went to the Kremlin, in Moscow,

to interview Putin.

     Li felt nervous before talking with Putin. "But his greeting and warm smile put me at ease," she said.

     Li admires Putin very much, because of his strong will and style of leadership. "He looks very cool,"

Li said. During her interview, Li asked Putin whether he plans to educate his two teenage daughters to be

officials in the future. Putin smiled and answered he hopes they can do whatever job suits their interests

and personalities.

     Although Li would only have several minutes, she started working on her interview questions last

August after applying for the opportunity. "Journalists work is by no means easy. You need to do lots

of homework on your interviewee," she said. She read many books about Putin and Russia in her spare

time.?

     Li's parents encouraged her to be a student journalist. "We fully support her, as long as it does not

affect her studies," said her father. Previously in her job for a student magazine, Chinese Young

Journalists, she wrote a letter to President Hu Jintao during the SARS epidemic.

     Li has learnt a lot from her experience. She said learning to manage her time and developing the

confidence to speak with important people were not the things she could learn in class.?

1. The underlined word "interviewee" in the fifth paragraph probably means ______.

A. the person who interviews?

B. the person who is interviewed?

C. the person who know how to interview?

D. the person who plan to interview a famous people?

2. Which of the following best describes Li Jing's parents' attitude towards her being a student journalist?

A. They think to be a student journalist is purely a waste of time.?

B. They worry that to be a student journalist will affect her studies.?

C. They consider it is quite good for Li Jing on the condition of not striking her study.?

D. They neither support it nor object to it.?

3. Li Jing is different from those students of her age in that ________.

A. she doesn't like pop star Jay Chou?

B. she hates meeting with the NBA hero Yao Ming?

C. she wants to meet neither Jay Chou nor Yao Ming?

D. she dreams of meeting the present powerful Russian leader?

4. Which of the following statements is NOT TRUE?

A. Li realized her dream just because of her hard work.?

B. Li was at ease at the first sight of president Putin.?

C. Li considers Putin a great leader because of his strong will and style of leadership.

D. Li thinks it impossible to learn in class the confidence to speak with great people.