问题 实验题

已知木炭在一定条件下与浓硝酸反应生成两种+4价的氧化物,为了探究一氧化氮(NO)能否与过氧化钠反应,以及反应后的产物中是否有亚硝酸钠(NaNO2),某小组同学设计了如图所示装置(夹持仪器和连接用的胶管已经省略)。

(1)①为了完成该实验,虚线框内还需要连接B~E四套装置,按气流方向连接的顺序为a →(  )(  )→ (  )(  )→ (  ) (  )→ (  )(  )(填仪器接口的字母编号)。

②连接好仪器,检查气密性,装入药品后,要通入一段时间的氮气,再滴加浓硝酸,点燃酒精灯,通入氮气的主要目的是________________________。

(2)装置E中观察到的主要实验现象有_______________。

(3)装置C的作用是__________________。

(4)某同学经查阅资料后发现亚硝酸是弱酸,性质不稳定,室温下易分解成一氧化氮。装置D中充分反应后,设计实验证明D中是否有亚硝酸钠生成:_______________(写出检验步骤及现象)。

(5)亚硝酸钠在酸性条件下可将I-氧化为I2,该反应常用于亚硝酸钠含量的测定,请写出该反应的离子方程式:___________________。

答案

(1)hi→de→bc→fg(或gf);排除装置中的空气,防止一氧化氮被空气中的氧气氧化为二氧化氮

(2)溶液由无色变成蓝色,有无色气体逸出

(3)除去一氧化氮中的二氧化碳

(4)取少量D中的固体于试管中,加入稀硫酸,若溶液中有气泡产生且在试管液面上方变成红棕色气体,则D中有亚硝酸钠生成(或其他合理答案)

(5)2NO2+2I-+4H+=2NO+I2+2H2O

多项选择题
单项选择题

After winning a big game, athletes are often asked how they feel. Usually athletes say how (1) it is to win this big game. On the contrary, the fact is that losing a big game, or in my case, all the games, can be even harder.

From the spectators’ point of view, last year’s basketball (2) for my high school team was nothing (3) of an embarrassment. And (4) 0 and 20 is certainly nothing to be proud of, that season had a bigger impact on me than any other. As a team captain, I knew it probably wouldn’t be the (5) year, but did I ever think we would lose every game Of course not. Since six of our top players had graduated, it was clear that we were a (n) (6) team who would struggle. The struggle began earlier than expected, (7) , as our team center was suspended (禁赛) for the season, and two key members decided to (8) for some reason. At this point, dropping out probably passed through every player’s mind, but in the end, we all stuck if out, (9) to work still harder.

Then there came a time when even our (10) and given up on us. Personally, I felt like it was (11) worthwhile giving my all. I thought, if even the coach doesn’t believe in us, why should I But just as my hope began to (12) , a teammate called a meeting. He said," Nobody thinks we are going to win, but, as teammates and friends, we (13) it to each other to go all out every game. "

It was that moment that (14) me how to be a leader. It hit me that I certainly didn’t (15) the role. As a leader you can never quit (16) the team who looks up to you. It is one (17) to be named captain, feel great and go through the motions, but it is quite another to be a real captain and make sure everyone realizes their full (18) all the time.

I am sure it is great to go through without losing and bringing home awards. But in all honesty, I (19) the fact that my team lost every game last year. It may not help me to become a better basketball player, but it already has made me a better leader, and (20)

7().

A.meanwhile

B.though

C.instead

D.somehow