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问题 问答题

用化学方程式解释下列事实．

（1）用硫酸铜配制农药波尔多液时不能用铁制容器

（2）工业上常用稀盐酸除铁锈（铁锈的主要成分是Fe2O3）

答案

（1）铁的活动性比铜强可以置换出铜，故答案为：Fe+CuSO4=Cu+FeSO4

（2）盐酸能与氧化铁反应生成氯化铁与水，故答案为：Fe2O3+6HCl=2FeCl3+3H2O

阅读理解

读一读，判断正误。         

     Last week I went to Hainan for vacation.  I went there by train. The train was late for three hours. 

The first day in Hainan I had fish and crabs. And I had a bad stomachache. From the second to the

fifth day, I couldn't go out, because it rained all day. It was sunny the last day. I didn't go swimming

because I went to see the doctor.  I had a bad vacation.

1. ( )

2. ( )

3. ( )

4. ( )

5. ( )
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多项选择题

用于饮水消毒的方法有（）

A.氯气

B.漂白粉

C.生石灰

D.高锰酸钾

E.煮沸
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