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问题 计算题



(1)请在图中画出c(H2)随时间t的变化曲线图；

(2)平衡时c(O2)平为             mol／L。

(3)欲计算出平衡时O2的浓度，除已知“H2O(g)

和CO”的物质的量外，至少需要知道平衡体

系中某两种气体的平衡浓度。这两种气体除

可以是H2O和CO2外还可以是        。

(4)在其它条件不变的情况下，若改为起始时在

容器中充入2molH2和2molCO2，则上述两反

应达到平衡时，c(O2)平=         mol／L。

答案

(8分)(1)如右图

(2)0．5mol／L

(3)H2和CO(或H2和CO2或H2O和CO)

(4)0．5mol／L  (每空2分)

（1）根据化学反应方程式和题给信息：

2H2O(g)2H2+O2，    2CO+O22CO2                                        

开始   2            0   0       2   0.625      0           

变化  1.25        1.25  0.625   0.25  0.125     0.25          

平衡  0.75        1.25  0.625   1.75  0.50      0.25          

在化学反应中，变化值和化学计量数成正比，可得答案。（1）（2）两问可求得，（3）此问解答时在两个方程式中，只要知道除共同物质O2外的任意两个数据即可，所以以下三组均可：H2和CO(或H2和CO2或H2O和CO)，（4）其它条件不变，可知加入2molH2和2molCO2达到的平衡与原平衡是等效平衡。结果同（2）。

阅读理解
阅读下列短文，从每小题所给的四个选项（A、B、C和D）中，选出最佳选项。
         One of the most surprising things about football in England is the great knowledge of the game which even
the smallest schoolboy seems to have. He can tell you the names of players in most of the important teams. He
has pictures of them and knows the results of large numbers of matches. He will tell you who he expects to win
such and such a match, and his opinion is usually as good as that of men three of four times his age.
        Most schools in England take football seriously — much more seriously than nearly all European schools,
where lessons are all that are important, and games are left for the children themselves. In England, it is believed
that education is not only a matter of filling a boy's mind with facts in the classroom, education also means the
training of character, and one of the best ways of training character is by means of games, especially team
games, where the boy or girl has to learn to work with others for his team, instead of working for himself alone.
The school, therefore, plans games and matches for its pupils. Football is a good team game, good both for the
body and the mind. That is why it is every school's game in England.
1. In England schoolboys seem to              .
[ ]
A. know a great deal about football games
B. learn football in class
C. know all the result of football matches
D. work together in football teams
2. In England a boy's opinion of a match is often            .
[ ]
A. three or four times better than that of grown men
B. worse than that grown men
C. as good as that of grown men
D. worth considering three or four times
3. In almost all European schools, lessons are             .
[ ]
A. left for the children themselves
B. what the children like best
C. as important as football games
D. considered the most important
4. In England education means             .
[ ]
A. filling children's mind with stories
B. more than the teaching of knowledge
C. the teaching of lessons only
D. training character by means of football games
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单项选择题

在动物细胞工程和胚胎工程中所用的物质和其发挥的作用正确的组合是（）

A．肝素——使卵母细胞成熟

B．胃蛋白酶——动物细胞培养时分散细胞

C．聚乙二醇——诱导细胞分化

D．促性腺激素——促进供体母畜超数排卵
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