问题 填空题

.(1)除去FeCl2溶液中混入的CuCl2杂质,用     试剂,化学方程式为____________

(2)鉴别KCl溶液和K2CO3的试剂是     ,离子方程式为____________

(3)按要求写出下列反应的离子方程式

①铁与硫酸铜溶液反应                                               

②碳酸氢钠溶液溶于盐酸                           

③氢氧化铜溶于硫酸                               

答案

(10分)(1)Fe     Fe+CuCl2=FeCl2+Cu

(2)HCl      2H++CO32-=CO2↑+H2O

(3)①Fe+Cu2+=Fe2++Cu

②HCO3-+H+= CO2↑+H2O

③Cu(OH)2+2H+=Cu2++2H2O

(1)铁能和氯化铜反应生成氯化亚铁和铜,所以除去FeCl2溶液中混入的CuCl2杂质,用铁即可,方程式为Fe+CuCl2=FeCl2+Cu。

(2)碳酸钾能和盐酸反应产生CO2气体,而氯化钾和盐酸不反应,据此可以鉴别,方程式为2H++CO32-=CO2↑+H2O。

(3)离子方程式的书写,关键是判断哪些物质用化学式表示,哪些物质用离子表示。凡是同时满足易溶和易电离的都用离子表示,其余都是用化学式表示。

单项选择题

July 21,2007 was a typical English summer’s day—it rained for 24 hours ! As usual, I rushed home from work at midday to check on the house. Nothing was amiss. By the time I left work at 5 pm, however, the road into our village was flooded. Our house had never been flooded, but as I opened the front door, a wave of water greeted me. Thank God the kids weren’t with me, because the house was 5 feet deep in water. We lost everything downstairs. And the plaster of the walls, ceilings pulled down.

At first we tried to push on through. We didn’t want to move the children out of home, so we camped upstairs. We put a sheet of plastic across the floor to protect us from the damp. But after three months, we felt very sick, so we moved to a wooden house in a park. The house was small, but at first we were all just delighted to be in a new place. Unfortunately, things took longer than expected and we were there for 10 months. The life there was inconvenient. What surprised me most was how much I missed being part of a community. We had lived in a friendly village with good neighbors, and I’d never thought how much I’d miss that.

Although our situation was very hard, it’s difficult to feel too sorry for yourself when you look at what’s happening elsewhere. I watched a news report about floods in Northern India and thought, "We didn’t have a straw but that was swept away, and our house is still standing. We’re lucky. "

We moved back home in August. With December coming, there’s still reconstruction work to be done, so it’s difficult to prepare for Christmas. But I can’t wait—I’m going to throw a party for our friends in the village to say thanks for their support. This year, I won’t need any gifts—living away from home for months has made me realize how little we actually need or miss all our possessions. Although we are replacing things, there’s really no rush—we have our home back, and that’s the main thing.

The attitude of the author toward his experience is ()

A.disappointment

B.friendly

C.memorable

D.happily

多项选择题