下列有关反应离子方程式错误的是
| A.KOH溶液与过量的SO2反应: OH—+SO2==HSO3— |
| B.Na2SO3溶液与稀硫酸反应 SO32—+2H+==SO2↑+H2O |
| C.NaHSO3溶液中通入氯气:HSO3—+Cl2 +H2O==SO42—+3H++2Cl— |
| D.石灰石与稀硝酸反应:CO32—+2H+==H2O+CO2↑ |
VI.书面表达(10分)
假设你是李明,你的国外网友Eric在网上看到几幅中国剪纸(Chinese paper cut),Eric对此很感兴趣,给你发来邮件询问有关中国剪纸的信息,请你根据下表提示给他回复邮件。
| Chinese Paper Cut | |
| long history | over 2,000 years |
| very popular | in different parts of China, young or old, be fond of, do well in… |
| different shapes | |
| Where do people put Chinese paper cuts?… | |
要求:
1. 文中不得出现真实的人名和校名;
2. 词数:80个左右。
能大量共存于同一溶液中,且当水电离c(H+)=10-13mol/L时,又能发生反应的离子组是
①Na+、Ba2+、C1—、HCO3—②K+、NH4+、CH3COO—、SO42—
③Ca2+、NH4+、SO42—、SO32— ④Fe3+、Na+、SCN—、C1—
⑤A13+、Na+、HCO3—、NO3—
①Na+、Ba2+、C1—、HCO3—②K+、NH4+、CH3COO—、SO42—
③Ca2+、NH4+、SO42—、SO32— ④Fe3+、Na+、SCN—、C1—
⑤A13+、Na+、HCO3—、NO3—
| A.只有① | B.②③ | C.①④ | D.①② |
As we all know, no one is perfect, and everyone has his own ______.
| A.mistakes | B.weakness | C.tricks | D.benefits |
My English teacher is very funny . He has really long hair and wears earring in one ear . He likes to wear purple shirts and orange pants . He also uses all kinds of slang(俚语) words from 1970s. When he likes something , he’ll say it’s really “ groovy(酷的)”. I think he played the guitar in a rock band when he was young .
The other day , he walked into class and noticed (注意) that there was a new student . He asked him , “Hey ,man ,what’s happening ?” The student was very confused(困惑的) ,but we all laughed because we knew that the teacher was just saying hello . “You’re new ,aren’t you ?” The teacher asked . The student was surprised , and said to himself , “Is this the teacher ? He looks strange(奇怪 ).” Then he explained(解释) to all us , “Sorry .Maybe I’m in the wrong classroom .”
【小题1】Why is the English teacher strange ?
| A.He wears pretty clothes |
| B.He uses slang words and has a strange appearance |
| C.He speaks strange English . |
| D.He played the guitar in a rock band . |
| A.A ring and purple shirts . | B.Orange pants and a scarf |
| C.An earring and orange pants . | D.Purple shirt and red pants . |
| A.He was a fomous singer |
| B.He was a guitar player in the rock band . |
| C.He sold records . |
| D.He was an English teacher . |
| A.He was easygoing as a friend . | B.He was very strict . |
| C.He was surprised to see him | D.He was very confused. |
A . He never saw such a strange teacher .
B . He was afraid of the teacher .
C. He didn’t like the classroom .
D. B and C.