问题 问答题

经过一年的化学学习,我们能从化学的视角去看物质,感受化学的重要.

(1)水是生命之源,而无色透明的液态水从微观角度看是由______构成的.将液态水加热变成水蒸气发生的是______变化(填“物理”或“化学”),而将水通电生成氢气发生的是______ 变化(填“物理”或“化学”),这两个变化的本质区别是______.虽然地球上水的储量很大,但是淡水资源却很少,请你设计一句公益广告词以增强众爱惜保护水资源的意识,你的设计是______;

(2)我们用联胺(N2H4)作燃烧将发射卫星的火箭送入太空.发射时联胺与N2O4燃烧生成氮气和水,反应的化学方程式为______.

(3)通过初中化学的学习,我们知道通过多种途径可制取氧气.其中属于物理变化的是______(填序号)

A.加热氧化汞          B.分离空气           C.加热分解KClO3 D.加热分解KMnO4 E.分解H2O2

(4)3月31日晚,某市积极参加今年的“地球一小时”活动,以实际行动倡导节能减排.短短60分钟的熄灯可以为我们赖以生存的地球做大贡献,因为每节约1度电,就减少约1000g二氧化碳的排放,若这1000g二氧化碳由单质碳燃烧产生,则可以节约碳的质量是多少?

答案

(1)无色透明的液态水从微观角度看是由水分子构成的,将液态水加热变成水蒸气发生的是物理变化,将水通电生成氢气发生的是化学变化,这两个变化的本质区别是分子是否发生改变;节约用水,人人有责是很好的公益广告.

故填:水分子;  物理;化学; 分子是否发生改变;节约用水,人人有责.

(2)联胺与N2O4反应生成氮气和水,反应的化学方程式为:2N2H4+N2O4

 点燃 
.
 
3N2+4H2O.

故填:2N2H4+N2O4

 点燃 
.
 
3N2+4H2O.

(3)加热氧化汞、加热分解KClO3 、加热分解KMnO4 、分解H2O2制取氧气时都能够发生化学变化;分离空气制取氧气发生的是物理变化.

故填:B.              

(4)设可以节约碳的质量为X,

    C+O2  

 点燃 
.
 
 CO2   

    12             44

    X             1000g

     

12
44
=
X
1000g

     X=272.7g,

答:可以节约碳的质量为272.7g.

填空题
单项选择题

In order to understand, however imperfectly, what is meant by "face", we must take (1) of the fact that, as a race, the Chinese have a ply (2) instinct. The theatre may almost be said to be the only national amusement, and the Chinese have for theatricals a (3) like that of the Englishman (4) athletics, or the Spaniard for bull-fights. Upon very slight provocation, any Chinese regards himself in the (5) of an actor in a drama. He throws himself into theatrical attitudes, performs the salaam, falls upon his knees, prostrates himself and strikes his head upon the earth, (6) circumstances which to an Occidental seem to make such actions superfluous, (7) to say ridiculous. A Chinese thinks in theatrical terms. When roused in self-defense he addresses two or three persons as if they were a multitude. He exclaims: "I say this in the presence of You, and You, and You, who are all here present. " If his troubles are adjusted he (8) of himself as having "got off the stage" with credit, and if they are not adjusted he finds no way to "retire from the stage". All this, (9) it clearly understood, has nothing to do with realities. The question is never of facts, but always of (10) . If a fine speech has been (11) at the proper time and in the proper way, the requirement of the play is met. We are not to go behind the scenes, for that would (12) all the plays in the world. Properly to execute acts like these in all the complex relations of life, is to have "face". To fail them, to ignore them, to be thwarted in the performance of them, this is to " (13) face". Once rightly apprehended, "face" will be found to be in itself a (14) to the combination lock of many of the most important characteristics of the Chinese.

It should be added that the principles which regulate "face" and its attainment are often wholly (15) the intellectual apprehension of the Occidental, who is constantly forgetting the theatrical element, and wandering (16) into the irrelevant regions of fact. To him it often seems that Chinese "face" is not unlike the South Sea Island taboo, a force of undeniable potency, but capricious, and not reducible to rule, deserving only to be abolished and replaced by common sense. At this point Chinese and Occidentals must agree to (17) , for they can never be brought to view the same things in the same light. In the adjustment of the incessant quarrels which distract every hamlet, it is necessary for the "peace-talkers" to take a careful account of the (18) of "face" as European statesmen once did of the balance of power. The object in such cases is not the execution of even-handed justice, which, even if theoretically desirable, seldom (19) to an Oriental as a possibility, but such an arrangement as will distribute to all concerned "face" in due proportions. The same principle often applies in the settlement of lawsuits, a very large percentage of which end in what may be called a (20) game.

1()

A.account

B.hold

C.shape

D.care