问题 问答题

化合反应是中学化学中最基本的反应类型之一.

已知:单质(1)+单质(2)=化合物,请写出满足以下要求的三个化合反应的方程式:

①所涉及的元素都是短周期元素;②6种单质分别属于6个不同的主族.

______;______;______.

答案

根据题目要求,可写金属与非金属的反应、非金属与非金属的反应,且符合下列条件:①所涉及的元素都是短周期元素;②6种单质分别属于6个不同的主族.

故符合条件的化学方程式有:

①C+O2(足量)

 点燃 
.
 
CO2 或 Si+O2
 高温 
.
 
SiO2 或2C+O2
 点燃 
.
 
 2CO

②Mg+Cl2=MgCl2  或2Al+3Cl2

  △  
.
 
2AlCl3 

③N2+3H2

催化剂
.
高温高压
2NH3

故答案为:①C+O2(足量)

 点燃 
.
 
CO2 或 Si+O2
 高温 
.
 
SiO2 或2C+O2
 点燃 
.
 
 2CO

②Mg+Cl2=MgCl2  或2Al+3Cl2

  △  
.
 
2AlCl3 

③N2+3H2

催化剂
.
高温高压
2NH3

填空题
阅读理解

A. Independence leading to family breakup
B. Women’s easy and convenient life in USA
C. No marriage for many people nowadays
D. Average American families getting small
E. Full freedom for young women
F. Divorce--- a social problem in USA
小题1:_________
Marriage, like other social instructions, is showing the strains of modern life. While more Americans are getting married today than ever before, the divorce rate is also disturbingly on the rise (one divorce for every three marriages last year). Why should this be so, and what, if anything, can we do to reverse this trend?
小题2:__________
For most people, life is easier and more comfortable than ever before. Convenience foods from the supermarket simplify shopping and cooking. Household appliances like the vacuum cleaner and the washing machine have made housework much easier to do. Released from these household chores, many wives have found jobs outside the home. Women are achieving economic independence.
小题3:_______
Families, too, are simpler today. In American, it is not customary for parents to live with their married children. With our greater mobility, relatives have scattered, the parents retiring to Florida or Arizona and the young people, after they marry, going wherever their jobs or their interests take them.
小题4:________
Young adult women have new freedom, too. While attending college, they often live away from home, sometimes far from their parents or their relatives. After college, they move to the city, find a job, and set up “bachelor” apartment. This is the era of women’s liberation.
小题5:________
But all this freedom and affluence have had an unforeseen and in some respects a devastating effect on marriage. Men and women, no longer dependent on each other for food and maintenance, find it harder to accept the responsibilities and restraints or endurance the misunderstandings of married life. When happiness becomes misery, many couples decide to terminate their marriage through divorce. On the other hand, there is a growing trend today for couples in trouble to try to save their marriage by consulting a professional counselor. He listens patiently while they talk, knowing that only through self-understanding can they solve their problems.