问题 选择题

下列事实不能用勒夏特列原理解释的是                  (    )

A.新制的氯水在光照条件下颜色变浅

B.开启啤酒瓶后,瓶中立刻泛起大量泡沫

C.高锰酸钾(KMnO4)溶液加水稀释后颜色变浅

D.工业生产硫酸的过程中使用过量的空气以提高SO2的利用率

答案

答案:C

题目分析:能用勒夏特列原理解释的是存在化学平衡的反应,且化学平衡要发生移动。KMnO4溶液加水稀释后溶液变浅不存在平衡,所以不能用勒夏特列原理解释。答案选C。

点评:勒夏特列原理是改变影响平衡移动的一个因素,平衡向减弱这种改变的方向移动。

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.

According to the passage, why do people join groups that practice secondary cooperation

A.To share the happiness with others.

B.To get rewards for themselves.

C.To associate with people who have similar backgrounds.

D.To defeat a common enemy.

单项选择题