问题 填空题

(8分)某反应中反应物与生成物有:AsH3、H2SO4、KBrO3、K2SO4、H3AsO4、H2O和一种未知物质X。(As为砷元素)

(1)已知KBrO3在反应中得到电子,则该反应的还原剂是________。

(2)已知0.2 mol KBrO3在反应中得到1 mol电子生成1 mol X,则X的化学式为________。

(3)根据上述反应可推知________。

a.氧化性:KBrO3>H3AsO4          b.H3ASO4是还原产物

c.还原性:AsH3>X                d.K2SO4和H2O是还原产物

(4)请将反应物的化学式和配平后的系数填入下列相应的位置中,并用“单线桥”标出电子转移的方向和数目。

 

答案

(8分) (1)AsH3 (2)Br2 (3)ac   (4) (每空2分)

阅读理解

阅读理解。

     In some foreign countries, some people don't like the number 13.They don't think 13 is a lucky number.

For example, they don't like to live on the thirteenth floor.

     My friend Jack has got the same idea. He doesn't like the number 13, either.

     One day, my friend Jack asked some friends to dinner. Mr and Mrs came here, too. When all of his friends

arrived, he asked them to sit around the dinner table. He began to count the people in his mind while they were

having the delicious food. Suddenly, he cried out, "Oh, there are thirteen people here!" Everyone's face turned

white except Mr Brown. He said slowly with a smile on his face, "Don't worry, my dear friends. We have

fourteen people here. My wife Mrs Brown will have a baby in a few months. She's in the family way now."

     All of them became happy again.

     "Congratulations!" they said to Mr and Mrs Brown. They enjoyed the nice food and had a good time that

evening.

1. Some foreigners think the number 13 is ______.

A. lucky

B. luckily

C. unlucky

D. unluckily

2. Mr and Mrs Brown were Jack's _____.

A. parents

B. friends

C. classmates

D. relatives

3. Everybody's face turned white when they _____.

A. saw Jack

B. saw the food

C. heard the number 13

D. were drinking

4. The sentence"She is in the family way now" means ______.

A. she is going to have a baby

B. she is at home

C. she is on her way home

D. she is coming from home now

5. All of them became happy again because _____.

A. Mr Brown told not to worry

B. they enjoyed the delicious food

C. Mr Brown would have a baby

D. the number of people was 14 not 13

单项选择题 A1/A2型题