问题 填空题

比较、分析、归纳是学习化学的有效方法。现有以下反应:

①Zn+CuCl2=ZnCl2+Cu ;    ②Cu+2AgNO3=Cu(NO3)2+Ag ;    

③Cl2+2NaBr=2NaCl+Br2;  ④I2+Na2S=2NaI=S ;   ⑤Br2+2KI=2KBr+I2

(1)通过比较、分析,可以发现上述反应均属于基本反应类型中的 ____        反应。在分析者五个反应前后个元素的化合价,我们发现了一个相似之处                      

(2)通过分析①和②,可以得出锌、银、铜三种金属的活动性顺序是                

(3)非金属单质也有类似的反应规律,分析③、④和⑤可以判断S 、Cl2、I2、Br2的活动性由强到弱的顺序为               ,据此还可以判断下列反应不可能发生的是     _   

A、Cl2+2NaI=2NaCl+I2    

B、I2+2KBr=2KI+Br2    

C、Br2+Na2S=2NaBr+S      

D、Cl2+2K2S=2KCl+S

答案

(1)置换;反应前后均有一种元素化合价升高,另一种元素化合价降低

(2)Zn >Cu >Ag 

(3)Cl2>Br2>I2>S;B

阅读理解

阅读理解诶。

     Tristan da Cunha, a 38-square-mile island, is the farthest inhabited island in the world, according to the

Guinness Book Records. It is 1,510 miles southwest of its nearest neighbor, St. Helena, and 1, 950 miles

west of Africa. Discovered by the Portuguese admiral (葡萄牙海军上将) of the same name in 1506 and

settled in 1810, the island belongs to Great Britain and has a population of a few hundred.

     Coming in a close second-and often wrongly mentioned as the most distant land-is Easter Island, which

lies 1, 260 miles east of its nearest neighbor. Pitcairn Island, and 2, 300 miles west of South America.

     The mountainous 64-square-mile island was settled around the 5th century, supposedly by people who

were lost at sea. They had no connection with the outside world for more than a thousand years, giving them

plenty of time to build more than 1, 000 huge stone figures, called moat, for which the island is most famous.

     On Easter Sunday, 1722, however, settlers from Holland moved in and gave the island its name. Today,

2,000 people live on the Chilean territory (智利领土). They share one street, a small airport and a few hours

of television per day.

1. It can be learned from the text that the island of Tristan da Cunha _____.

A. was named after its discoverer

B. got its name from Holland settlers

C. was named by the British government

D. got its name from the Guinness Book of Records

2. Which of the following is most famous for moat?

A. Tristan da Cunha.

B. Pitcairn Island.

C. Easter Island.

D. St. Helena.

3. Which country does Easter Island belong to?

A. Britain.

B. Holland.

C. Portugal.

D. Chile.

名词解释