问题 填空题

在标准状况下,2.24L氯气通入足量的石灰乳中,发生的化学反应方程式______,所得的漂白粉中有效成分为______,漂白粉置于空气中易失效的原因(用方程式表示)______,______.

答案

氯气通入足量的石灰乳中,可以制取漂白粉,

发生的化学反应方程式为:2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O;其中的Ca(ClO)2是漂白粉中有效成分,漂白粉置于空气中易失效的原因是:Ca(ClO)2+CO2+H2O=2HClO+CaCO3↓;2HClO=2HCl+O2↑,

故答案为:2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O;Ca(ClO)2;Ca(ClO)2+CO2+H2O=2HClO+CaCO3↓;2HClO

 光照 
.
 
2HCl+O2↑.

完形填空
When you sit down with your family to eat a meal, do you ever wonder when and where the      of using chopsticks (筷子) began?
People say that the first chopsticks were used in China 5,000 years ago. The practice became widespread in Korea, Vietnam and Japan. Today they are a symbol of        culture.
Of Asian co untries, Japan highlights the importance of chopsticks         a day to celebrate them. August 4 is        as Chopsticks Day in Japan.
The different         traditions of Asia lead to different kinds of chopsticks. For example the Japanese use sharp chopsticks         they eat a lot of fish. Sharp chopsticks are good for picking the fish from the bones.
Chopsticks are made from different kinds of material. Bamboo chopsticks are         because the material is easy to break apart and doesn’t burn easily. People also use wood and bone for chopsticks. Some rich people had theirs         from valuable metals. Many emperors used silver chopsticks, for it was believed that they would turn        if there was poison in the food.
There are also many table manners       with chopsticks. For instance, never stick your chopsticks upright in your rice bowl or tap on your bowl with your chopsticks. People believe this is impolite to the host.
小题1:
A.advantageB.traditionC.instru ction D.time
小题2:
A.EuropeanB.AmericanC.AsianD.Chinese
小题3:
A.withB.throughC.onD.over
小题4:
A.pickedB.madeC.usedD.set
小题5:
A.homingB.producingC.cookingD.gardening
小题6:
A.because B.soC.once D.unless
小题7:
A.usualB.commonC.generalD.strong
小题8:
A.to make B.makingC.made D.being made
小题9:
A.blackB.grayC.dark D.red
小题10:
A.popularB.filledC.compared D.connected
单项选择题 A1/A2型题