问题 单项选择题

最常使用的射线挡块材料是()

A、蜡

B、低熔点铅

C、锡

D、铜

E、铁

答案

参考答案:B

阅读理解

阅读理解。

     Mr Smith lived in a town by the sea. He had a few shops in the town center. He managed (管理)

them carefully and got a lot of money. He was very rich but he didn't think he was the richest in the town.

So he tried to get more money.

     Once Mr Smith was asked to dinner. He heard there was  a  circus  troupe (马戏团 )  in  the  town.

The circus troupe had nothing strange except a five-legged (五条腿的) cow. People were interested in it

and most of them saw it.

     On his way home, Mr Smith heard an old man tell his grandson that there lived a lot of one-eyed

(独眼的) people on an island.  "Oh, dear!" Mr Smith said to himself'. "If I catch a one-eyed man and

show him all over the country, I'll get much money !"

     After he got home, he told his sons to manage the shops for him and he went to look for the island

without telling anybody about it. At last he reached the island and saw some one-eyed children. He was

so happy that he rushed towards the youngest one and carried him on his back. But he didn't know the

danger was coming to him. A few one- eyed men ran to him with knives in their hands. He threw the child

to the ground and tried to run away, but it was too late. They caught him and showed him on the island

because only he had two eyes there.

根据文内容判断正( T)误 ( F)。

1. Mr Smith was a rich shopkeeper.

2. Mr Smith had a lot of money, and he didn't want to get more.

3. Mr Smith thought the old man's story was true.

4. Most people in the town saw the three-legged

5. The people on the island have never seen a man with two eyes.

实验题

(Ⅰ)某校合作探究小组利用业余时间上网搜索烯类化合物与溴加成反应的有关信息,获得的有关结构与数据列表如下(以乙烯为标准)

烯类化合物相对速率
(CH3)2C=CHCH310.4
CH3CH=CH22.03
CH2=CH21.00
CH2=CHBr0.04
(1)据表中数据,总结烯类化合物加溴时,反应速率与碳碳双键上取代基的种类、个数间的关系:___________________________                ______

(2)下列化合物与氯化氢加成时,取代基对速率的影响与上述规律类似,其中反应速率最慢的是_________。

A.(CH3)2C=" C" (CH3)2    B.CH3CH=CHCH3    C.CH2=CH2         D.CH2=CHCl

(Ⅱ)另一合作探究小组根据所学知识归纳整理乙醇、水、苯酚、碳酸( HO—C—OH)、乙酸分子中羟基上氢原子的活泼性。                                   O               

(1)甲同学将一些化学实验收集整理如下:

A.金属钠分别与水和乙醇反应         B.苯酚、二氧化碳、乙酸分别与氢氧化钠溶液反应

C.向二氧化碳水溶液、乙酸溶液中分别滴加紫色石蕊试液

D.将鸡蛋壳破碎后加入到醋酸溶液中            E.向苯酚溶液中滴加FeCl3溶液

F.向苯酚钠溶液中分别通入二氧化碳和滴加盐酸

其中能说明水比乙醇强的是         (填字母,下同),乙酸比碳酸强的是        

(2)乙同学与其他同学合作,设计了一个简单的一次性完成的实验装置来验证乙酸、碳酸和苯酚溶液的酸性强弱,以说明其羟基上氢原子的活泼性顺序。根据下列实验装置图回答有关问题。

① A对应的仪器名称是                   

② 各仪器的连接顺序是(填数字,仪器可重复使用)                                 

③ 饱和NaHCO3溶液作用是                                               

④ 实验过程中观察到的现象有