问题 填空题

某温度时,在一个2L的密闭容器中,X、Y、Z三种物质的物质的量随时间的变化曲线如图所示.根据图中数据,试填写下列空白:

(1)该反应的化学方程式为______.

(2)反应开始至2min,气体Z的平均反应速率为______.

答案

(1)由图象可以看出,反应中X、Y的物质的量减小,Z的物质的量增多,则X、Y为反应物,Z为生成物,

且△n(X):△n(Y):△n(Z)=0.3mol:0.1mol:0.2mol=3:1:2,则反应的化学方程式为:3X+Y

2Z,

故答案为:3X+Y

2Z;

(2)c(Z)=

0.2mol
2L
2min
=0.05mol•(L•min)-1,故答案为:0.05mol•(L•min)-1

单项选择题
阅读理解

Have fun with stamp collecting...Join   Collectors Club Starter Pack

the Collectors Club today!        1.100 used stamps and hinges

If you enjoy learning all about stamps,then    2.The Collectors Club Guide to Collecting

the Royal Mail’s Collectors Club is for you.   3.The latest Collectors Club magazine

Join the club and discover the fascinating        (packed with news and views about

world of stamps.There are over 70,000           stamps,quizzes and competitions,all in

members and it is one of the biggest clubs of          color)

its kind in the country.              4.Album pages

Become a member today and you will receive   5.Badge and stickers

lots of wonderful stamp collecting goodies...      6.Membership card

·A Starter pack…               7.Royal Mail Stamp Calendar

And every two months...                      * * * * * * * * * * * * * * * * * * *

·Collectors Club magazine        Already Registered?

·Collectors Corner supplement         Sign In Here!

And every year...             Learn More

·A new Stamp Calendar      View a Flash Presentation

·A set of Album Pages        about our club(3.51MB)

Join today!               Crick here:

It won’t cost you much to experience the fun     http://www.Collectors Club/introduction swf

of stamp collecting.

60.This advertisement is written for people who want to        ·

A.find out where the club is                B. get something free from the club

C.develop stamp collection as a hobby        D.make money through collecting stamps

61.  From the advertisement we can learn       .

A.Collectors Club is among the biggest clubs of its kind in the country

B.how much you must pay to become a member of the club

C.today is the last day for stamp collectors to join the club

D.members may receive a set of album pages every month

62.Where is this advertisement most probably found?

A.In a newspaper.       B.On a web page.

C.In a magazine.           D.On a TV program.