问题 阅读理解

阅读理解。

    The great ship, Titanic (泰坦尼克号), set off for (启程去……) America in April 1912 on its first trip.

It was carrying more than 2,000 people.

    The Titanic was the largest and finest at that time. People thought it was safe (安全) to be on the ship

because it had 16 compartments (密封舱) with it. Even if (即使) 4 of those were broken (被撞破), it

would still be able to stay on the sea.

    Four days later, when the Titanic was crossing the sea, the man on watch (值班) suddenly saw a very

large iceberg (冰山) ahead. The great ship turned quickly on time, but before long there was a sound from

below. The captain (船长) went down to see what was the matter. To his surprise, he found the ship was

sinking (下沉) fast because 5 compartments had been broken (被撞破)! Many people jumped out into the

water. As there were not enough lifeboats (救生船), about 1,500 people died.

1. The Titanic set off from England to            . [ ]

A. the U.S.A.

B. Australia

C. Canada

D. Europe

2. People thought it was safe to be on the ship because            .[ ]

A. It had 16 compartments

B. It could not sink if 4 compartments were broken

C. It had more lifeboats than other ships

D. Both A and B

3. The ship was hit            . [ ]

A. soon after it had crossed the sea

B. when it started to cross the sea

C. when a very large iceberg was suddenly seen ahead

D. soon after it turned quickly on time

4. Which of the following is not true? [ ]

A. The captain didn't find anything wrong with the ship.

B. Hundreds of people jumped out into the water.

C. The ship began to sink because 5 compartments had been broken.

D. About 1,500 lives were lost.

5. Which of the following is true? [ ]

A. The ship could carry less than 2,000 people.

B. The ship had enough lifeboats.

C. The ship could still be safe even if four of its compartments were broken.

D. The ship was the biggest and safest in the world.

答案

1. A  2. A  3. D  4. A  5. C

实验题

饱和氯水与石灰石反应是制取较浓HClO溶液的方法之一。某兴趣小组进行了如下实验探究。

实验一:定性研究。

①在试管中加入过量的块状碳酸钙,再加入约20 mL饱和氯水(如图所示),充分反应,有少量气泡产生,溶液浅黄绿色退去;

②过滤,将滤液滴在有色布条上,发现滤液比氯水的漂白性更强;

③为了确定反应产物,将滤液分为三份,分别进行以下实验:

第一份与石灰水混合,立即产生大量白色沉淀;

第二份与稀盐酸混合,立即产生大量无色气体;

第三份滤液加热,看到滤液变浑浊且有大量无色气体产生。经检测,上述实验中产生的无色气体均为CO2

请回答:

(1)反应后所得的溶液漂白性比氯水强的原因是                        

(2)依据上述实验可推知:滤液中的溶质除CaCl2、HClO外,还有       (填写溶质的化学式)。

实验二:定量研究。

在圆底烧瓶底部,用一塑料网包住块状石灰石(过量)与150 mL饱和氯水反应,按下图所示装置实验,待不再产生气泡后,将塑料网中剩余的石灰石提出液面,将装置密封后再加热,煮沸烧瓶中的液体,量筒中的气体不再增加时停止实验。

请回答:

(3)实验结束后检测到量筒中收集到的气体除CO2外还有O2,请写出Ⅰ中产生O2的化学反应方程式                               

(4)为减少用装置Ⅲ收集气体过程中CO2因溶解而造成的损失,请你对装置Ⅲ进行改进(水槽中仍为水),最简单的方法是                               

单项选择题