问题 填空题

我国铜矿蕴藏丰富,炼铜历史悠久.

(1)某地产的一种矿石叫辉铜矿,主要成分为硫化亚铜(Cu2S),其中铜的化合价是______,铜元素与硫元素的质量比为______.

(2)当地还产一种矿石叫孔雀石,成分Cu2(OH)2CO3,加热时生成三种氧化物.该反应的化学方程式为______,反应类型是______.反应中生成的黑色氧化物在一定条件下能被还原,生成红色固体,在该反应中可加入的还原剂有______等.

答案

(1)硫化亚铜中硫的化合价是-2价,可以计算出铜的化合价是+1价.铜元素与硫元素的质量比是64×2:32=4:1.

(2)据Cu2(OH)2CO3化学式分析加热生成的三种氧化物分别是:氧化铜、水、二氧化碳,反应的化学方程式为:Cu2(OH)2CO3

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2CuO+H2O+CO2↑.反应物是一种,生成物是三种,属于分解反应;氧化铜、水、二氧化碳中氧化铜是黑色固体,常见的还原剂主要有氢气、碳、一氧化碳等.

故答案为:(1)+1;4:1;(2)Cu2(OH)2CO3

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2CuO+H2O+CO2↑,分解反应;C、H2或CO(任选两种)

单项选择题

Cooperation is the common endeavor of two or more people to perform a task or reach a jointly cherished goal. Like competition and conflict, there are different forms of cooperation, based on group organization and attitudes.In the first form, known as primary cooperation, group and individual unite. The group contains nearly all of each individual’’s life. The rewards of the group’’s work are shared with each member. There is an interlocking identity of individual, group, and task performed. Means and goals become one, for cooperation itself is valued.While primary cooperation is most often characteristic of preliterate societies, secondary cooperation is characteristic of many modern societies. In secondary cooperation, individuals devote only part of their lives to the group. Cooperation itself is not a value. Most members of the group feel loyalty, but the welfare of the group is not the first consideration. Members perform tasks so that they can separately enjoy the fruits of their cooperation in the form of salary, prestige, or power. Business offices and professional athletic teams are examples of secondary cooperation.In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are purely opportunistic; the organization is loose and fragile. Accommodation involves common means to achieve antagonistic goals; it breaks down when the common means cease to aid each party in reaching its goals. This is not, strictly speaking, cooperation at all, and hence the somewhat contradictory term antagonistic cooperation is sometimes used for this relationship.

Which of the following is NOT given as a name for the third type of cooperation

A.Tertiary cooperation

B.Accommodation

C.Latent conflict

D.Antagonistic cooperation

单项选择题