问题 填空题

铁元素是一种重要的金属元素,铁及其化合物间可以相互转化。

(1)检验溶液中Fe3+存在的试剂是___________,证明Fe3+存在的现象是___________。

(2)电子工业常用30%的FeCl3溶液腐蚀敷在绝缘板上的铜箔,制造印刷电路板。

①写出FeCl3溶液与金属铜发生反应的化学方程式:_____________________________。

②某工程师为了从使用过的腐蚀废液中回收铜,并重新获得FeCl3溶液,准备采用下列步骤:

A.请写出上述实验中加入或生成的有关物质的化学式:

①___________,②___________,④___________。

B.请写出含有②的滤液与⑥反应的离子方程式:____________________________。

(3)实验室里保存FeSO4溶液时,常在溶液中加入铁钉或铁粉防止溶液里的Fe2+被氧化,请用离子方程式说明其中的道理:__________________________。

答案

(1)KSCN溶液;溶液呈红色

(2)①、2Fe3++Cu==2Fe2++Cu2+

②、A:①Fe;②FeCl2;④HCl;B:2Fe2++Cl2==2Fe3++2Cl-

(3)Fe+2Fe3+==3Fe2+

单项选择题
阅读理解

阅读理解

     The singer, Mick Jagger, of the Rolling Stones sings a song  that tells people they can't

always get what they want but if we try sometimes we can get what we need. The past years in

my life my parents have told me this saying many times. I've always complained about the quote(引语). Although over time I have told myself to learn from it.

     This year my girlfriend flew off to college in West Palm, Florida. This has been a killer for me because I haven't been able to see her and she is having a rough time in school. The last two

months have been hard but we are working through it. I have been trying to get my dad to buy

me a plane ticket to go down there. My dad told me if I brought him some money he would help me pay for the ticket. I started to complain to him because I had no way of getting any money to give him. I spent several days and  nights thinking of ways to earn money to go to see my

girlfriend. I finally came to the conclusion that I would get a job and work hard to earn some

money to give to my dad. I applied to Safeway and I ended up getting the job.

     I have been working at Safeway for about a month now and work hard to earn money to go to see my girlfriend. The other day my mum had surprised me and told me that she asked her boss

if she could use their business miles(旅费) to buy me a ticket down to Florida for two weeks. I

was very thankful and told her I would help pay for anything that I have to. The thought of me

working hard and getting a job showed my mum that I really cared and was trying my best to be a successful person. I believe that you can't always get what you want but if you try sometimes,

you get what you need.

1. The author's parents often told him the saying quoted from the song because ________.

A. He liked to complain to them about his life

B. They expected him to earn from the singer

C. He always wanted to get everything he wanted

D. They tried to educate him to do things for himself

2. What does the word"killer"underlined in the second paragraph refer to?

A. Something that is quite troublesome.

B. Something that is very difficult.

C. A person who kills purposely.

D. A person who treats women very badly.

3. What can we infer from the passage?

A. The author was lazy and unwilling to work hard.

B. The author's father was too mean to give him money.

C. The author's actual action won support from his mother.

D. The author was unable to tear himself away his girlfriend.

4. By writing the passage, the author tries to show________.

A. we can do nothing without money

B. fathers are strict while monthers are kind

C. it's hard for parents to bring up their children

D. we should try to rely on ourselves for everything