问题 填空题

学习化学应该明确“从生活中来,到生活中去”道理.在生产生活中,我们会遇到各种各样的化学反应.请你写出下列反应的化学方程式.(注意反应条件并配平)

(1)已知氯化铁溶液跟铜反应生成氯化铜和氯化亚铁.电子工业常用30%的FeCl3溶液腐蚀敷在绝缘板上的铜箔,制造印刷电板______.

(2)玻璃中含有SiO2,不能用带磨口玻璃塞的试剂瓶保存碱性溶液的原因______.

(3)胃舒平含有氢氧化铝,可用来治疗胃酸(盐酸)过多______.

(4)在高温下一氧化碳与氧化铁反应可以制得金属铁______.

(5)将铁加入硫酸铜溶液中炼铜(湿法炼铜)______.

(6)工业上用氯气和消石灰(氢氧化钙乳浊液)反应制取漂白粉(主要成分是氯化钙和次氯酸钙)______.

答案

(1)氯化铁溶液跟铜反应,+3价的铁离子被还原成+2价的铁离子,铜单质被氧化成+2价的铜离子.

故答案为:2FeCl3+Cu=CuCl2+2FeCl2

(2)带磨口玻璃塞的试剂瓶,由于磨口接触面积大,SiO2和NaOH反应生成具有粘性的硅酸钠,不便于下一次打开.故答案为:SiO2+2NaOH=Na2SiO3+H2O;

(3)氢氧化铝和胃酸(盐酸)反应生成盐和水.故答案为:Al(OH)3+3HCl=AlCl3+3H2O;

(4)一氧化碳与氧化铁反应可以制得金属铁.一氧化碳具有还原性,能将氧化铁中的+3价的铁还原为0价.故答案为:3CO+Fe2O3

高温
.
3CO2+2Fe;

(5)铁的金属活动性比铜强.铁能将铜从它的盐溶液中置换出.故答案为:Fe+CuSO4=FeSO4+Cu;

(6)氯气和消石灰(氢氧化钙乳浊液)反应,氯从单质氯气中的零价氯变为产物CaCl2中-1价和产物Ca(ClO)2中+1价.故答案为:2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O;

完形填空

When William, a 10-year-old boy planned to learn the piano, the music teacher was reluctant (不愿意)to accept him. She   31  her students to start their music lessons at a young age when their   32  were able to move quickly and easily.

“William, why do you want to learn the piano?” the teacher asked.

“I want to play for my mother.”

She noticed the   33  in his eyes as he answered her. She had no heart to   34  and accepted William as her student. But at each music lesson, William appeared to be in a hurry and played   35  “My mother is waiting outside for me,” he would tell the teacher. She was tempted to advise William not to   36  his time with lessons anymore as he   37  hit the right notes.  38  there was something about William — - she was fascinated with the tender look in his eyes   39  he mentioned “Mother”.

Suddenly, William stopped coming for his lessons. At the end of the semester year, the music teacher decided to   40  a piano recital (独奏会) for her students and she asked them to participate.

She was   41  to find William’s application to contribute a musical piece. She would place him last in the recital   42  he made mistakes.

The day came and William appeared.  43  it was his turn to play, William bowed before the audience and said he was thankful for the music teacher’s   44  with him. “Tonight I am dedicating (献)my music to my mother.” he said.

Everyone later asked why William did not bring his mother as she would   45  be proud. William replied, “My mother was   46  and she could never  47  me play during her life time.   48   she sacrificed her time and money to let me learn the piano. This morning Mother passed away. I am sure she is now  49  as she can hear my piano recital. I chose a piece of piano music by Beethoven. As you all know, Beethoven was deaf by the end of his career. But music always symbolized his   50  for freedom and I would like to dedicate it to Mother.”

小题1:.

A.hoped

B.persuaded

C.allowed

D.preferred小题2:.

A.fingers

B.brains

C.eyes

D.arms小题3:.

A.surprise

B.joys

C.tears

D.disappointment小题4:.  

A.put him down

B.turn him down

C.put him off

D.turn him off小题5:.  

A.badly

B.nicely

C.carefully

D.patiently小题6:.  

A.pass

B.take

C.kill

D.waste小题7:.  

A.ever

B.never

C.even

D.always小题8:.  

A.Instead

B.Therefore

C.Then

D.But小题9:.  

A.at one time

B.from time to time

C.each time

D.the first time小题10:.  

A.support

B.take

C.intend

D.organize小题11:.  

A.delighted

B.surprised

C.curious

D.angry小题12:.  

A.as far as

B.if only

C.in case

D.now that小题13:.  

A.Until

B.Since

C.While

D.When小题14:.  

A.patience

B.advice

C.guide

D.concern小题15:.  

A.surely

B.gradually

C.finally

D.quickly小题16:.  

A.blind

B.deaf

C.ill

D.wounded小题17:.  

A.watch

B.appreciate

C.teach

D.hear小题18:.  

A.Besides

B.Then

C.Yet

D.Otherwise小题19:.  

A.happy

B.relaxed

C.free

D.sad小题20:.  

A.effort

B.struggle

C.belief

D.challenge

单项选择题