问题 填空题

用化学方程式回答下列问题,并注明反应类型:

(1)白磷燃烧产生大量白烟______反应类型______;

(2)在铁桶中配制波尔多液,铁桶会被腐蚀______反应类型______;

(3)有人误食BaCl2而中毒,可服用Na2SO4溶液解毒______.反应类型______;

(4)电解熔融的MgCl2可以获得金属镁______反应类型______.

答案

(1)白磷燃烧产生大量白烟,白烟的成分是五氧化二磷,反应的化学方程式为:4P+5O2

 点燃 
.
 
2P2O5;反应特点是多变一,故反应类型为化合反应;

(2)在铁桶中配制波尔多液,波尔多液中含有硫酸铜,铁和硫酸铜能发生置换反应,化学方程式为:Fe+CuSO4═FeSO4+Cu,反应特点是单质和化合物反应生成另一种单质和化合物,故反应类型为置换反应;

(3)BaCl2和Na2SO4溶液反应生成硫酸钡沉淀和氯化钠,化学方程式为:BaCl2+Na2SO4═BaSO4↓+2NaCl.反应类型符合复分解反应的特点,故属于复分解反应;

(4)电解熔融的MgCl2可以获得金属镁和氯气,化学方程式为:MgCl2

 通电 
.
 
Mg+Cl2↑,反应特点是一变多,属于分解反应.

故答案为:(1)4P+5O2

 点燃 
.
 
2P2O5,化合反应;

(2)Fe+CuSO4═FeSO4+Cu,置换反应;

(3)BaCl2+Na2SO4═BaSO4↓+2NaCl,复分解反应;

(4)MgCl2

 通电 
.
 
Mg+Cl2↑,分解反应.

阅读理解

阅读理解。

Here is some news from Dalian Daily.

·President's pet.

     Do you keep a pet? American President Obama does.He calls his new dog Bo.It is six months

 old.The president's family like the dog very much.Look! They are having fun with Bo on the South

Lawn (南草坪)of the White House.The president's daughter, Malia ,is showing the dog off.

·Back on her feet.

     Mosha is a young elephant in Thailand.She lost her right front leg after stepping on a landmine(地雷)

two years ago.She was taken to a hospital and became the first elephant in the world with a prosthetic leg

(假肢).

     Now aged three Mosha is growing up.She is happy to have the new prosthetic leg.

·Liu Xiang

     World champion Liu Xiang returned to Shanghai on March 8.The 25-year -old star had a foot

operation in December in America.It took him three months to recover(康复)and train there.It is

said that some doctors are ready in Shanghai to help with Liu's recovery.Liu left the 2008 Beijing

Olympics because of his foot injury(损伤)last August.

1.The name of the president's dog is          .

A.Washington    

B.Bo    

C.Malia          

D.Obama 

2.How old is the dog?

A.Two months old  

B.Three years old  

C.Six months old  

D.Six years old

3.How did the elephant lose his front leg?

A.She had a traffic accident.        

B.She stepped on the landmine.

C.She was ill.                    

D.She fell into a big hole.

4.Liu Xiang had his foot operation in         .

A.China          

B.America        

C.Japan          

D.Australia

5.Liu Xiang left the Beijing Olympics because       

A.he was afraid of the other players      

B.he was too nervous to take part in it

C.his coach told him to do that          

D.his foot hurt

问答题 简答题