问题 填空题

氧化镁在医药、建筑等行业应用广泛。硫酸镁还原热解制备高纯氧化镁是一种新的探索。以菱镁矿(主要成分为MgCO3,含少量FeCO3 )为原料制备高纯氧化镁的实验流程如下:

生成氢氧化物沉淀的pH

 Mg(OH)2Fe(OH)2Fe(OH)3
开始沉淀时9.46.31.5
完全沉淀时12.48.32.8
 

(1)MgCO3与稀硫酸反应的离子方程式为                         

(2)加氨水调节溶液的PH范围为               

(3)滤渣2 的成分是           (填化学式)。

(4)煅烧过程存在以下反应:

2MgSO4+C2MgO+2SO2↑+CO2

MgSO4+CMgO+SO2↑+CO↑

MgSO4+3CMgO+S↓+3CO↑

利用下图装置对煅烧产生的气体进行分步吸收或收集。

①D中收集的气体是          (填化学式)。

②B中盛放的溶液是          (填字母)。

a.NaOH 溶液 b.Na2CO3溶液  c.稀硫酸 d.KMnO4溶液

③A中得到的淡黄色固体与热的NaOH溶液反应,产物中元素最高价态为+4,写出该反应的离子方程式:                             

答案

(1)MgCO3+2H=Mg2+CO2↑+H2O

(2)2.8<PH<9.4

(3)Fe(OH)3

(4)①CO   ②d   ③3S+6OH2S2+SO32+3H2O(3分)

题目分析:(1)MgCO3是难溶电解质,书写离子方程式时不能拆开,所以MgCO3与稀硫酸反应的离子方程式为MgCO3+2H=Mg2+CO2↑+H2O

(2)加氨水调节溶液的PH的目的是使铁元素沉淀而镁不能沉淀,铁元素在溶液中以铁离子存在,所以溶液的PH的范围是2.8<PH<9.4

(3)铁元素在溶液中以铁离子存在,所以滤渣2的成分是Fe(OH)3

(4)①右图装置对煅烧产生的气体进行分步吸收或收集,所以最终的剩余气体为CO,②短少的气体产物有SO2、CO2、CO,三种气体分步被吸收或收集,SO2、CO2都能与a、b反应,与c都不能反应,而高锰酸钾溶液可与SO2反应,所以B中应放高锰酸钾溶液吸收SO2,答案选d。③淡黄色固体为S,与热的NaOH溶液发生歧化反应,S被氧化为SO32,同时被还原成S2,其离子方程式为3S+6OH2S2+SO32+3H2O

阅读理解

Most of the time, we choose colors for decorating based on our personal taste and our sense of aesthetics (审美学). But, a number of color experts believe that colors have an effect on our emotions and that it would be wise of us to be conscious of that before settling on a definite choice.

Some of the effects of colors are well known and accepted by most people. In fact, those effects have been the subject of serious research and experiments and have been scientifically proven. But not all scientists agree on the validity (正确性) of the results.

When we become interested in the psychological effects of colors, it is important to know that not all societies share our opinion of those effects on our emotions. What we hold as an "objective" observation on a color is often nothing more than a reflection of our cultural belongingness, which has attributed properties to that color for generations.

Why is it not possible for us to hold a really objective discourse(论述)on the subject? In part, because it is very difficult to separate the psychological from the symbolic, the symbolic aspects are definitely cultural. Often, and this without our realizing it, they influence our understanding of colors and the following emotions - both psychological aspects. Black and white are good examples. In western countries, black is considered serious, dramatic and sometimes sad. People are warned against its potentially depressing effects on decoration. Black is the traditional color of mourning. White, on the other hand, is associated with purity, peace and optimism. For those reasons, white is the traditional color of bridal dresses. No one would think of attending a funeral in white. Any more than it would occur to a bride to wear black. We simply remain convinced that it is not in the "nature" of those colors. Yet, in certain oriental countries, it is white, not black that is the color of mourning.

That having been said, there is some “overlapping” in the properties different cultures attribute to certain colors. For example, Feng Shui, the traditional Chinese philosophy that distinguishes between good and evil influences explains colors much in the same way as the majority of western color specialists. Is that to say that colors have real natural properties which all humans perceive(感知) in the same way or is the phenomenon an example of the cross-influences that affect the thinking of cultures brought closer to one another by a certain Venetian(威尼斯人) called Marco Polo? It is difficult to say.

But, be that as it may, colors do affect us. And if you feel emotions for a certain color, note them and remember them. You may even wish to consider them next time you are planning to decorate. The decision is yours!

小题1: Most of the time, we ignore ______ when choosing colors for decoration.

A.personal taste

B.our aesthetics

C.cultural effects

D.psychological effects小题2:Why is it not possible for us to hold a really objective discourse on the subject?

A.Because it is often nothing more than a reflection of our cultural belongingness.

B.Because the colors have the properties for generations.

C.Because it is difficult to separate the psychological from the cultural.

D.Because the symbolic aspects influence our perception of colors.小题3: The italicized word “overlapping” is paragraph 6 is closest in meaning to______

A.difference

B.conflict

C.sameness

D.agreement小题4: In western countries, white is ______.

A.preferred by bridals

B.used in a funerals sometimes

C.depressing in decoration

D.pure in its nature小题5: According to the author, which of the following statements is certain?

A.Different cultures can have the same properties of colors.

B.If you feel emotions for a color, note them and remember them.

C.All humans perceive colors’ natural properties in the same way.

D.Marco Polo disclosed the psychological effects of colors.

单项选择题 A1/A2型题