问题 填空题

写出下列反应的化学方程式并注明反应类型:

(1)铁丝在氧气中燃烧:______;

(2)双氧水分解制氧气:______;

(3)氯酸钾加热制氧气:______;

(4)高锰酸钾制氧气:______.

答案

(1)铁丝在氧气中燃烧生成四氧化三铁,反应的化学方程式为:3Fe+2O2

 点燃 
.
 
Fe3O4;该反应符合“多变一”的特征,属于化合反应.

(2)过氧化氢在二氧化锰的催化作用下生成水和氧气,反应的化学方程式为:2H2O2

 MnO2 
.
 
2H2O+O2↑,该反应符合“一变多”的特征,属于分解反应.

(3)氯酸钾在二氧化锰的催化作用下生成氯化钾和氧气,反应的化学方程式为:2KClO3

MnO2
.
2KCl+3O2↑,该反应符合“一变多”的特征,属于分解反应.

(4)高锰酸钾在加热条件下生成锰酸钾、二氧化锰和氧气,反应的化学方程式是:2KMnO4

  △  
.
 
K2MnO4+MnO2+O2↑,该反应符合“一变多”的特征,属于分解反应.

故答案为:(1)3Fe+2O2

 点燃 
.
 
Fe3O4,化合反应;(2)2H2O2
 MnO2 
.
 
2H2O+O2↑,分解反应;(3)2KClO3
MnO2
.
2KCl+3O2↑,分解反应;(4)2KMnO4
  △  
.
 
K2MnO4+MnO2+O2↑,分解反应.

完形填空
My father died when I was a baby, and my mother had to go out to work. I was the only  36  so I had no brothers and sisters to play with at home. I used to play in the street with other children, or ride my bike down to the park, but I remember I  37  a lot of time just sitting at home reading. We had a television, I think, but don’t remember   38  it very much.
My grandparents lived with us and we used to do a lot of things together.I remember we played cards a lot. At the weekends, my mother always  39  -- We often went down to the sea and swam, and I   40  to swim when I was quite young.
We didn’t have a car, so we went everywhere by bus. Occasionally(偶尔),one of my uncles used to come and take us out in his car, which was a great   41 .For holidays we always went to the seaside, but never far away maybe a short train journey.
My mother wasn’t very    42 , and I don’t remember her ever    43   me. In fact(事实上),I got my way too much.
I was given small pocket money because we weren’t very   44  and I probably spent most of it on sweets, as far as I remember I don’t think anyone thought they were   45  for you then.
小题1:
A.childB.fatherC.friendD.mother
小题2:
A.usedB.keptC.tookD.spent
小题3:
A.repairingB.listening toC.watchingD.looking at
小题4:
A.let me inB.took me outC.told me storiesD.went shopping
小题5:
A.hatesB.learnedC.stoppedD.forgot
小题6:
A.gameB.chanceC.painD.pleasure
小题7:
A.strict(严格的)B.kindC.interestedD.worried
小题8:
A.playing withB.staying withC.beatingD.loving
小题9:
A.busyB.happyC.richD.well
小题10:
A.goodB.badC.importantD.delicious
单项选择题 B1型题