问题 选择题

在0.10mol•L-1NH3•H2O溶液中,加入少量NH4Cl晶体后,引起的变化是(  )

A.NH3•H2O的电离程度减小

B.NH3•H2O的电离常数增大

C.溶液的导电能力不变

D.溶液的pH增大

答案

A.向氨水中加入氯化铵晶体,铵根离子浓度增大,抑制NH3•H2O电离,则NH3•H2O电离程度减小,故A正确;

B.NH3•H2O的电离常数只受温度的影响,温度不变,则平衡常数不变,故B错误;

C.加入少量NH4Cl晶体后,溶液离子浓度增大,则导电能力增强,故C错误;

D.加入少量NH4Cl晶体后,NH4+离子浓度增大,平衡向逆向移动,c(OH-)变小,pH减小,故D错误.

故选A.

解答题
阅读理解

阅读理解 

     When we think of leadership, we often think of strength and power . But what are these really, and how do they operate?

     Leadership today is not about forcing others to do things, if this is even possible,it is short-term, and

tends to backfire. If you order someone to do something against their will,they may do it because they feel they must,but the anger they feel will do more harm in the long-term,they will also experience fear.

     Fear causes the thinking brain to shut down, making the person unable to function at his or her best. If

they associate you with this emotion of fear,they will become less functional around you ,and you will have succeeded in not only shooting yourself in the foot, but possibly making a very good employee or partner

unable to perform effectively .Fear has no place in leadership.

     The way we influence people in a lasting way is by our own character,and our understanding and use of emotion. We can order someone to do something ,which may be part of the work day; or we can employ

them at the emotional level, so they became fully devoted to the projects and provide some of their own

motivation. Today's work place is all about relationships as a human being as well as a worker, Everyone

produces just a bit more for someone they like. Leaders understand the way things work. They know the

pay check is not the single most motivating factor in the work life of most people.

     The true strength of leadership is an inner strength that comes from the confidence of emotional

intelligence knowing your own emotions, and how to handle them, and those of others . Developing your

emotional intelligence is the single best thing you can do if you want to develop your relationships with

people around you, which is the key to the leadership skills.

1. An employee may have a feeling of fear in the work place when____.

A. he is forced to do things     

B. be cannot work at his best

C. he feels his brain shut down  

D. he thinks of his work as too heavy

2. Which of the following is TRUE according to the passage?

A.People tend to associate leadership with fear

B.Working conditions affect people's physical health

C. Good relationship is the key to business success

D. Smart people are more functional in the work place

3. To positively influence employees a leader should first of all ____

A. provide better suggestions    

B. develop his own personality

C.give his employees a pay rise  

D. hide his own emotion of fear

4.Good leadership is mainly seen in a leader's ability to____

A. provide a variety of project for employees

B. help raise employee's living standards

C. give employees specific instructions

D. deal wisely with employees' emotions