问题 填空题

焊接钢铁时常用的焊药为氯化铵,其作用是消除焊接处的铁锈。发生的反应体系中共有六种物质:

NH4Cl、FeCl3、N2、Fe2O3、Fe和X。

(1)根据题意,可判断出X是_________(写化学式)。

(2)写出并配平该反应的化学方程式:_________________________;

(3)发生氧化反应的物质是________,反应中4mol的氧化剂能_______(填“失去”或“得到”)_____

mol电子。

(4)反应中被氧化产生了11.2L(标准状况)的气体时,被还原的物质的质量为____________。

答案

(1)H2O

(2)6NH4Cl+4Fe2O3==6Fe+2FeCl3+3N2↑+12H2O

(3)NH4Cl;得到;24

(4)80g

阅读理解

阅读理解。

     Monkeys are clever and lively, but they are naughty and greedy (贪婪的) as well. Whenver they find

delicious food, they will eat enough. What's more, they will take it when they leave. They have suffered

(吃亏) a lot because of this. But they never change this way.

     In India, people use monkey's greed to catch them. Do you know how they can catch monkeys? Here

are some instructions.

    ◆ Make a hole in a big pumpkin (南瓜). The hole must be just right ----neither too big nor too small.

    ◆ Put some jujubes (枣) in the hole.

    ◆ Leave the pumpkin under a tree. Make sure there are some monkeys in the tree.

    ◆ Hide yourself and watch the monkeys.

    As soon you leave, the monkeys can't wait to come down to the pumpkin. When they find a hole in the

pumpkin, they don't know what's in it and one of them can't help putting its hand into the hole to find what

on earth there is. When it touches the jujubes, it will clench (攥紧) some of them in its hand. As a result, it

isn't able to take its fist (拳) out of the hole. You can't come close until this time. Will the monkey drop off

the pumpkin? Don't worry. It prefers the pumpkin than its life. It will run with the pumpkin, clenching its

fist more tightly. In the end, it is caught helplessly.

1. Monkeys haven't changed their way of doing with nice food because they are _______.

A. clever

B. lively

C. greedy

D. naughty

2. "The hole must be just right" means it is _______.

A. big enough for the monkey to put its hand in

B. smaller than a monkey's hand

C. bigger than a monkey's fist

D. bigger than a monkey's hand but smaller than its fist

3. Seeing the hole in the pumpkin, a monkey will _______.

A. be interested in

B. be afraid of

C. run away at once

D. take the pumpkin away in arms

4. Which of the following is true according to the passage?

A. Indians often catch the monkeys in this way.

B. sometimes monkeys are stupid.

C. as soon as the monkeys comes to the pumpkin, you can rush to catch it.

D. In India, monkeys like pumpkins every much.

5. What should we learn from the passage?

A. we should catch monkeys in this way.

B. One mustn't be greedy.

C. We should protect monkeys.

D. Come up with another way to catch monkeys.

单项选择题 B1型题