问题 填空题

如图所示是8000C时,X、Y、Z三种气体的浓度(c)随时间(t)的变化情况,t2是反应达到平衡的时间,写出反应的化学方程式:______.

答案

由图象可以看出,反应中X的物质的量减少,应为反应物,Y、Z的物质的量增多,应为生成物,

当反应进行到2min时,△n(X)=0.4mol,△n(Y)=0.2mol,△n(Z)=0.6mol,

则△n(X):△n(Y):△n(Z)=2:1:3,参加反应的物质的物质的量之比等于化学计量数之比,

则反应的方程式为:2X

Y+3Z,故答案为:2X

Y+3Z.

阅读理解

Six years ago, Ann graduated(毕业) from college with a degree in Art. Now she is twenty-nine and works for a large computer company. She takes classes twice a week after work. She is learning to use the computer program PowerPoint. “I enjoy the college, but my job doesn’t use the information I learned at college.“ Ann says. ”The course is helping me to do my job better.”

 In the past, when students graduated from college and got a job, they usually stopped studying. Today, lifelong learning is becoming more common. In many countries, some people return to school in their late twenties, thirties, or even older to get a higher degree. More people are taking training courses to improve their working skills after work. People can also get degrees or training through the Internet.

 Ann’s sixty-year-old mother and father are taking courses in Art and Music. “We love these two subjects. Learning is so much fun.”They say happily, “It’s never too old to learn.”

小题1:Ann graduated from college when she was     .

A.twenty-nine

B.twenty-six

C.twenty-three

D.twenty小题2:The underlined word ‘degree’ means ‘   ’ in Chinese.

A.温度

B.程度

C.学位

D.位置小题3:More people are taking training courses after work in order to     .

A.improve their working skills

B.enjoy Art and Music

C.study computer programs

D.make more money小题4:Which of the following is TRUE?

A.Ann doesn’t want to use the information she learned at college.

B.People in the past usually stopped studying after graduating from college.

C.People can only get information from their teachers.

D.Ann’s parents are too old to learn Art and Music.

单项选择题