问题 填空题

向AgNO3、Cu(NO3)、Zn(NO32,的混合溶液中加入一定量的铁粉,充分反应后过滤.

(1)写出上述任意一个反应的化学方程式______.

(2)如果向所得滤液中加稀盐酸有白色沉淀生成,则滤渣中一定有______.

(3)如果向所得滤渣中加稀盐酸有气泡产生,则滤液中一定含有的金属阳离子是______.

答案

(1)在金属活动性顺序中,锌>铁>氢>铜>银,铁能与硝酸银反应生成银和硝酸亚铁,可以和硝酸铜反应生成铜和硝酸亚铁,不能与硝酸锌反应,所以可得方程式;

(2)由于在金属活动性中铁>铜>银,所以放入铁后铁要先置换出硝酸银中银再去置换硝酸同种的铜,所以如果向所得滤液中加稀盐酸有白色沉淀生成,说明溶液中还存在银离子其白色沉淀是氯化银,因此硝酸铜一定还没有反应,所以滤渣会是银;

(3)由于在金属活动性中只有氢前金属才能和酸反应生成氢气,所以说明铁有剩余,因此银离子铜离子均被置换出来,所以溶液中的金属阳离子会有亚铁离子和没有反应的锌离子.

故答案为:(1)Fe+Cu(NO32=Fe(NO32+Cu

(2)银

(3)Fe2+、Zn2+

阅读理解

阅读下面的短文,并根据短文后的要求答题。

     Thomas Edison made more than 1,000 inventions in his life. (A) 他的许多发明已经改变了世界.  

His first invention was a vote recorder (投票记录器) in 1869. This machine allowed people to place a

vote by pressing a button instead of saying "Yes" or "No" . (B)H_____,American  government  officials

did not like Edison' s invention because they preferred to call out their votes.

     Then Edison started  a  company   with  his friend,  Franklin Pope.  (C) was , morning , night , busy ,

until , Edison , from , early , late. As a result of hard work, he invented telegraph to print the price of gold

and silver . He sold it to Western Union Company for $ 15,000.

     With some of the money Edison started his own company. Next he invented a stock ticker. (D) This

machine   was   used  to record   the   price of stocks (股票)in New York . Western Union paid Edison

$ 40,000 for this invention.

     Edison used this money to open a shop in Newark in the state of New Jersey. In 1875, Edison and

his family moved to Menlo Park in the same state. There he built his own laboratory.

1.(A)处划线部分译成英语:_________________________________

2.在(B)处填写一个适当的单词:____________

3.(C)处划线部分连词成句:_______________________________

4.(D)处划线部分译成汉语:______________________________

5.:Which state of America does Menlo Park belong to(属于) ?

       ______________________________________________

单项选择题