问题 选择题

两个极易导热的密闭容器A和B,容器A容积恒定,容器B容积可变,在温度、压强和起始体积相同的条件下往A和B中分别充入等物质的量的NO2,发生反应2NO2N2O4△H<0,以下说法正确的是(  )

A.反应起始时,两容器中的反应速率关系是v(A)<v(B)

B.反应过程中,两容器内的反应速率关系为v(A)<v(B)

C.两容器内的反应达到平衡所需时间一定相同

D.反应达到平衡时,两容器内的压强关系是p(A)>p(B)

答案

A、反应起始时,二氧化氮的浓度相同、温度相同、压强相同,反应速率相同,故A错误;

B、容器A中压强降低,容器B体压强不变,压强越大,反应速率越快,故v(A)<v(B),故B正确;

C、速率越快,到达平衡的时间越短,故容器B到达平衡所以时间少,故C错误;

D、容器A体积不变,随反应进行,反应混合气体的物质的量减小,容器A中压强降低,容器B体积可变,压强不变,故反应达到平衡时,两容器内的压强关系是p(A)<p(B),故D错误;

故选B.

阅读理解

阅读理解。

     A man from a big city with a new cart (马车) and a beautiful pair of horses was driving along a

country road . He did not give much attention to where he was going. Very soon he knew he lost his

way, but he kept on driving hoping he would meet someone or find his way back.

     It was a long way. For many hours he kept on driving. When it was almost dark he saw a farmer

who was working in a field. He stopped and shouted, "Hello, farmer!" "Hello, yourself!" the farmer

answered, still working.

     "Where does this road go?"

     "I have never seen it go anywhere. It always stays where it is." said the farmer, without stopping his

work.

     "How far is it to the next town?" said the stranger, with a little louder voice.

     "I don't know. I've never measured (测量) it ." Answered the farmer.

     By the time the city man was getting angry. "What do you know? You're the biggest fool I've seen."

The farmer stopped and turned and looked for a while at the man. Then he said, "Maybe I do not know

much, perhaps I'm a fool. But at least I'm not lost."

1. The city man said "Hello, farmer" because _______.

A. he was friendly to everyone    

B. he saw an old man in the country

C. he lost his way and he wished the farmer who would show him the way  

D. he was very happy

2. Did the farmer say anything to the city man?

A. Yes, he did.      

B. We don't know.    

C. No, he didn't.    

D. The city man didn't find his way.

3. The farmer didn't tell the city man the way to the next town because _______.

A. the farmer didn't know the way, either      

B. the farmer is busy working in the field

C. The city man asked the question rudely    

D. the farmer can't speak clearly

4. Was the farmer the biggest fool?

A. Yes, he was.      

B. No, he wasn't.      

C. Yes, he is.        

D. We don't know.

5. "I'm not lost" means "_______".

A. I'm not a fool.    

B. I haven't lost my way.  

C. I haven't lost anything.  

D. I haven't lost myself.

填空题