问题 选择题

下列反应的离子方程式书写中,正确的是

A.将氨水逐滴滴加到AlCl3溶液中:Al3++3OHAl(OH)3

B.铜与稀硝酸反应:Cu+4H+ +NO3Cu2++NO↑+2H2O

C.硫酸与氢氧化钡在溶液中反应: Ba2++OH+H++SO42—BaSO4↓+H2O

D.用FeCl3溶液腐蚀铜箔制造的印刷电路板: 2Fe3++Cu=2Fe2++Cu2+

答案

答案:D

题目分析:氨水是弱碱,应该用化学式表示,A不正确;B中电子的得失不守恒,B不正确;C不正确,应该是Ba2++2OH+2H++SO42— BaSO4↓+2H2O,答案选D。

点评:该题是高考中的高频题,属于中等难度的试题,试题侧重考查学生的能力。该题需要明确判断离子方程式正确与否的方法一般,即(1)检查反应能否发生。(2)检查反应物、生成物是否正确。(3)检查各物质拆分是否正确。(4)检查是否符合守恒关系(如:质量守恒和电荷守恒等)。(5)检查是否符合原化学方程式,然后灵活运用即可,有助于培养学生的逻辑思维能力,提高学生的应试能力和学习效率。

判断题
阅读理解

阅读理解。

                                                                    Count Me Out 

     Call me old-fashioned. Call me old. Call me what you want, but I refuse to become part of this new

Internet world.

     I do not possess a computer at home or at the office. Actually, I stopped going to an office 35 years ago,

when all communications were done with a pen, a typewriter, or, if the matter was of world-shaking

importance, over the telephone. Likewise, if you like something advertised in a newspaper or magazine, you

visited the shop selling it at the given address, or you phoned the number shown. Then you spoke to the fellow

and asked for further details.

     Tell me what you think of the following ad that appeared the other day in the newspaper. It was for a cure

for cancer and this is what it said: "Awareness is the key. Visit spfulford. com at the awareness site." There

was no address or telephone number for the site. So what do unfortunate people without a computer do if they

are seeking a cure for their illness?

     There are, I am told, certain advantages in having access to the Internet. You can, for example, send love

messages across the world or even get married to someone that you meet online. This bit doesn't interest me;

I have been happily married for 60 years. There are, of course, other activities for Internet users besides finding

love. They can pay bills, order groceries, or discuss with their doctors.

     And this is by no means all. More amazing things are yet to come in the near future. I read a newspaper

report recently that quoted Stephen Hawking, an important British scientist. "The complexity of a computer as

it exists today is probably less than the brain of an earthworm," he said. "But, as technology advances,

computers will become more complex, and a time may come when the Internet may develop 'consciousness.'

In other words, the Internet will be able to think, have feelings, and may well be able to act on its own."

     If Professor Hawking is right, I may change my attitude to computers. As I grow older each day, I would

like one of those that not only thinks for me but also accepts responsibilities for all my mistakes.

1. What's the meaning of the title "Count Me Out"?

A. Get me out of the Internet world.

B. Computers are trying to take control of life.

C. Modern technology pushes old people away.

D. Do not expect me to be a supporter of the Internet.

2. According to Paragraph 2, the author thinks computers are _____.

A. unnecessary

B. convenient

C. expensive

D. advanced

3. What might the author like about the future computer?

A. Taking blames.

B. Curing illnesses.

C. Delivering messages.

D. Responding to emotions.