(7分)在某温度下合成氨:N2+3H22NH3(△H”、“

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问题:

(7分)在某温度下合成氨:N2+3H22NH3(△H<0),把N2和H2以1︰1的物质的量之比混匀后分成两等份,同时分别充入A体积和B体积两个装有催化剂的真空容器中(A、B两容器容积固定),在保持同温度下,A、B两个容器的合成氨反应先后达到平衡状态。请回答:

(1)写出该反应的平衡常数表达式:_____________,KA______KB(填“>”、“<”或“=”)。

(2)平衡常数K值越大,表明建立平衡时__________

A.N2的转化率越低                                B.NH3的产量越小

C.正反应进行得越彻底

(3)欲增大该反应K值,可以采取的措施为__________

A.升高温度                                  B.降低温度      

C.增大N2、H2的浓度              D.使用高效的催化剂

(4)分析下表中数据后,完成下列问题[M(平)表示平衡时混合物的平均相对分子质量]:达平衡时,容器A中N2的转化率为___________,容器B中M(平)__________,容器______(填“A”或“B”)中,NH3的物质的量所占的比例较大。

 容器A容器B
M(平)20 
平衡时N2的转化率 10%

考点:化学平衡的有关计算影响化学平衡的因素达到化学平衡的标志化学平衡常数
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我国国家实验动物质量管理办法规定,全国实行统一的实验动物质量监督和质量合格认证制度。

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国家对传染病防治实行的方针是()。

A.服务群众

B.标本兼治

C.预防为主

D.监督管理

E.依靠科学

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“心有余悸”是描写人在恐惧中的( )

A.心境状态
B.应激状态
C.激情状态
D.热情状态

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在三角形连接的对称电源或负载中,线电流滞后相电流30°。()

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(46) John Dunlop, dean of the Faculty of Arts and Sciences from July 1970 to February 1973, thought that the most significant element in Harvard’s transition from the 1960s to the 1970s was not the student takeover of University Hall, but the institutional changes unleashed by that event. Dunlop was ideally suited to take charge in the confusing post-bust period. Forceful, self-confident, canny, he became the czar of the interregnum. He sought to restore civil discourse by engaging the faculty in institutional reform. He chaired the University Committee on Governance that Pusey and the Corporation set up in September 1969. (47) From it came a flow of subcommittee reports: on Harvard and money, faculty and student rights and responsibilities, the presidential selection process, the nature and purposes of the University, and the organization and functions of the Governing Boards and the president’s office.
The committee found a Corporation and a president overwhelmed by day-to-day problems. (48) It proposed that there be vice presidents of finance, administration, development, and government and community affairs, and that a senior academic officer—a chancellor or provost—foster interfaculty programs and speak for the president on matters of educational policy. (49) The authors knew that "the damage of the reputation of the administrative function is so pervasive in the University that the sudden assertion of its importance.., may send shock waves through the community and cause particular concern among Deans. " But they believed that it was essential "to staff and perform properly the neglected service functions" of the University.
Derek Bok decided that to plunge at once into centralized administration was "too much. " He agreed on the need for a passel of new vice presidents, but was well aware of the powerful Harvard tradition of autonomous schools and faculties led by baronial deans (He had been one himself). While he had favored the appointment of a provost before he took office, now he had second thoughts. The major responsibility of most university provosts was budgetary: deciding how the financial pie should be sliced. That would reduce the authority of the deans. Even less attractive was the notion of having a provost to deal with educational and academic matters; Bok intended to do that himself.
At the same time he was a p believer in professional expertise. (50) This meant breaking away from Harvard’s tradition of administrators whose qualifications consisted in good part of having gone to the College and having close Harvard ties. Bok sought a different type of bureaucrat, of the sort prevalent at other large universities: professionals with outside experience.

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