问题 填空题

某温度时,在2L密闭容器中X、Y、Z三种物质的物质的量随时间的变化曲线如图所示。由图中的数据分析,该反应的化学方程式为                       ;反应从开始至2min末,Z的平均反应速率为        

答案

3X + Y2Z   (2分)       

0.05 mol·L—1·min—1 (2分)

根据图像可知,XY是反应物,Z是生成物。2min是各种物质的物质的量不再发生变化,反应达到平衡状态,此时XYZ的物质的量的变化量分别是0.3mol、0.1mol和0.2mol,因此化学计量数之比是3:1:2,所以方程式为3X + Y2Z。Z的反应速率是

改错题

第二卷

第一节;短文改错(共10小题;每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个钩(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一个词:把多余的词用斜线(﹨)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Last night I was getting ready for the coming examination                     76.         

when the noise from my neighbor interrupts me. The noise                 77.           

went on and on. It was too loud that I could hardly pay                         78.         

attention to my study any longer. So I went to my neighbor’s houses       79.         

and said to him:“Excuse me, would you please turn up the               80.          

TV?I’m preparing for tomorrow’s examination.”Hear these                81.         

words, his face turned red. But he said , “OK,I will.                       82.         

I’m very sorry have made so much noise. Just now, the football            83.         

game was very wonderful. I was too exciting to control                      84.          

myself. I won’t do that again. Good luck in the your coming                85.          

examination.” After that, I got down to my study.

单项选择题 A1型题