问题 问答题

从化学方程式2H2

 通电 
.
 
 2H2↑+O2↑中,你能知道什么?(至少写出三点)

答案

质”的含义:①水在通电的时,生成氢气和氧气;②反应条件是通电;③反应物是水;④生成物是氢气和氧气

“量”的含义:从宏观看,①每36份质量的水在通电条件下,生成4份质量氢气和的32份质量氧气;即水、氢气和氧气质量比为9:1:8.从微观看,氢气、氧气和水都是由分子构成的,因此,这个化学方程式还表示了②在通电下,2个水分子生成2个氢分子和1个氧分子.

故答案为:①水在通电的时,生成氢气和氧气;

②反应条件是通电;

③反应物是水;

④生成物是氢气和氧气;

⑤每36份质量的水在通电条件下,生成4份质量氢气和的32份质量氧气;即水、氢气和氧气质量比为9:1:8;

⑥在通电下,2个水分子生成2个氢分子和1个氧分子;

只要以上答案任选三条即可.

阅读理解

阅读理解。

      Once upon a time, there lived a rich man. He had a servant (仆人). He and the servant loved wine

(酒) and good food very much. Each time the rich man left his home, the servant would drink the wine

and eat up(吃光)all the nice food in the house. The rich man knew what his servant did , but he had

never caught (抓住) his servant doing that.

     One morning, when he left home, he said to the servant, "Here are two bottles of poison (毒药) and

some nice food in the house. You must take care of (看管好) them." With these words, he went out.

     But the servant knew that the rich man had said was untrue (假的), after the rich man was away

from his home, he enjoyed a nice meal. Because he drank too much, he was drunk (喝醉酒) and fell

to the ground. When the rich man came back, he couldn't find his food and his wine. He became very

angry. He woke (叫醒) the servant up. But the servant told his story very well. He said a cat had eaten

up everything. He was afraid (害怕) to be punished (被惩罚), so he drank the poison to kill (杀死)

himself.

1. In the story, _______ liked wine and good food very much.

A. the rich man  

B. the servant    

C. both A and B    

D. nobody

2. The rich man told the servant that there was poison in the two bottles, because _______.

A. there was in fact poison in the bottles

B. he did not want the servant to drink his wine

C. he wanted to kill the cat

D. he wanted to kill the servant

3. In fact (实际上), _______ ate all the nice food and drank the wine. 

A. the servant    

B. cat        

C. the rich man      

D. nobody

4. From the story, we know that the servant is very _______.

A. lazy (懒惰的)    

B. stupid (蠢的)      

C. clever (聪明的)  

D. kind

解答题