问题 选择题

25 ℃时,水的电离达到平衡:H2OH++OH- H>0,下列叙述正确的是(  )

A.向水中加入稀氨水,平衡逆向移动,c(OH-)降低

B.向水中加入少量固体硫酸氢钠,c(H+)增大,KW不变

C.向水中加入少量固体CH3COONa,平衡逆向移动,c(H+)降低

D.将水加热,KW增大,pH不变

答案

答案:B

加碱抑制水的电离,使水的电离平衡逆向移动,但c(OH-)增大,A项错误;硫酸氢钠电离出c(H+),使水的电离平衡逆向移动,但c(H+)增大,KW仅与温度有关,故KW不变,B项正确;C项中CH3COO-与水电离出的H+结合,使水的电离平衡正向移动,C项错误;将水加热促进水的电离,c(H+)增大,pH减小,D项错误。

阅读理解
Many young people want to be pop stars. Pop stars are rich. Many people think they are leading a happy and easy life. In fact, they have very hard lives. They spend much of their time on travel. Sometimes the travel is interesting, but in most time it is boring to pop stars. The following chart is a day’s life of a pop star.
Feb. 10, 2007
5:00
Woke up and had breakfast in the hotel, packed bags. Took taxi to airport.
7:30
Plane took off half an hour later than usual for the bad weather.
8:30
Plane landed. Waited for luggage for half an hour. Signed for fans at the airport.
9:45
Arrived at the hotel and had a short rest.
10:00
Started out to attend the meeting with fans and gave an interview to the local reporters.
11:00
Went to radio station to attend the live show.
12:00
Had lunch with local producer.
13:00
Went to theatre and prepared for the night’s show. The lighting of the theatre was good, but the band did poorly.
17:00
Back to hotel. Tried to have a rest. Still worried about the band.
18:00
Had supper, but ate little.
18:30
Went to theatre again and got ready for show.
19:00
Sang very well, and audience gave a warm welcome. The band improved a little.
22:00
Show was over. Very tired from it.
23:00
Back to hotel. Took a bath. Too excited to sleep, so watched TV
0:00
Fell asleep, with TV on.
小题1:According to the chart, the pop star was a ________.
A.singerB.dancer C.playerD.pianist.
小题2:According to his plan, his plane should have taken off at _______.
A.6:30B.7:00 C.7:30D.:8:00
小题3: At the radio station, the pop star ________.
A.showed fans how to become famousB.gave a performance on the air
C.met fans and signed for themD.told people how he lived his life
小题4:From this passage we get to know that ________.
A.not all people like pop starsB.pop stars have their own bands
C.fans are troublesome for pop starsD.to be a pop star is not all fun
问答题 简答题