问题 问答题

用 Y形管或 Y 形导管完成以下实验。

(1)图9中Y形管左侧管中加入无色酚酞试液,右侧管中加入浓氨水,一段时间后,可观察到的现象:________________________,用分子的观点解释这一现象:________________________。

(2)图10 中 Y 形导管平放于桌面,实验中可观察到的现象;________________________,用化学方程式解释结论:________________________;若把Y形导管固定在铁架台上(如图 11 ) , a 管位于上方, b 管位于下方,两石蕊试纸均湿润,可观察到 b 管中试纸变色比a 管明显,原因:________________________。

答案

(1)无色酚酞变红色,分子的不断运动

(2)湿润的紫色石蕊试纸变红色,干燥的紫色石蕊试纸无明显变化     

H2O+CO2=H2CO3;二氧化碳的密度比空气大,主要从b管中通过。

CO2 是一种无色无味的气体,其密度比空气的大。CO2能使润湿的石蕊试纸变红,其原因是H2O+CO2=H2CO3,H2CO3使紫色石蕊变红,并不是CO2

阅读理解

When I was about 12, I had an enemy (敌人), a girl who liked to point out my shortcomings (缺点). Week by week her list grew: I was very thin; I wasn’t a good student; I talked too much;  I was too proud (骄傲), and so on. I tried to hear all these as long as I could. At last, I became very angry. I ran to my father with tears in my eyes.

He listened to me quietly. Then he asked, “Are the thing she said true or not? Janet, didn’t you ever think about what you are really like? Well, you now have that girl’s opinion. Go and make a list of everything she said and mark the points that are true. Pay no attention to the other things she said.”

I did as he told me. To my great surprise, I discovered that about half the things were true. Some of them I couldn’t change (like being very thin), but a good number I could --- and suddenly I wanted to change. For the first time I got a very clear picture of myself.

I brought the list back to Daddy. He wouldn’t like to take it. “That is just for you,” he said, “You know better than anyone else the truth about yourself. But you have to learn to listen, not just close your ears in anger and feeling hurt. When something said about you is true, you will find it will be of help to you. Our world is full of people who think they know your duty. Don’t shut your ears. Listen to them all, but hear the truth and do the right thing.”

Daddy’s advice has returned to me at many important periods. In my life, I have never had a better piece of advice.

小题1:Which do you think would be the best title (标题) for this passage?

A.Not An Enemy, But the Best Friend

B.The Best Advice I’ve Ever Had

C.My Father

D.My Childhood小题2:Why did the writer’s father listen to her quietly? Because__________.

A.he believed that most of what his daughter’s “enemy” said was true.

B.he had been so angry with his daughter’s shortcomings that he wanted to show this by keeping quiet for some time

C.he knew that his daughter would not listen to him at that moment

D.he wasn’t quite sure which girl was telling the truth小题3:What did the father do after he had heard his daughter’s complaint?

A.He told her not to pay any attention to what her “enemy” had said.

B.He criticized(批评) her and told her to overcome (克服) her shortcomings.

C.He told her to write down all that her “enemy” had said about her and pay attention only to the things that were true.

D.He wouldn’t like to take the list and have a look at it.小题4:What does “I got a very clear picture of myself” mean?

A.I had my picture taken and this time it was a very clear one.

B.I asked someone to draw a very clear picture of myself.

C.The picture I got this time was clearer than those I had got before.

D.I came to know myself very clearly this time.

问答题 简答题