问题 计算题

将46g金属钠和54g金属铝同时放入足量的水中,最后得到5.0L溶质仅为偏铝酸钠的溶液。计算:

⑴得到的气体在标准状况下的体积。

⑵所得溶液中偏铝酸钠的物质的量浓度。

答案

67.2L

解:n(Na)=2mol               n(Al)=2mol                  

2Na +  2H2O =  2NaOH +  H2

2mol               2mol      22.4L                   

2Al  + 2H2O +  2NaOH =  2NaAlO2 +  3H2

2mol               2mol        2mol      67.2L

⑵ 得到的气体在标准状况下的体积为:22.4L+67.2L=89.6L        

⑵得到的溶液为NaAlO2溶液,其物质的量浓度为:                 

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.Even if this is possible, it is shortterm, and

tends to produce unexpected and unwanted results.If you order someone to do something against their

will, they may do it because they feel they have to, 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 connect 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 does no good to 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 will become fully devoted to the projects and provide some

of their own motivation.Today's work place is all about relationships.

     Anyone works harder in a positive environment in which they're recognized and valued 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 important 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 relationship with

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

1.  The writer thinks that it is not________for us to connect leadership with strength and power.

A.  possible 

B.  necessary

C.  easy  

D.  effective

2.  People may NOT be working hard when________.

A.  they're regarded as human beings

B.  they like their leaders

C.  money is taken as the most important

D.  leaders understand the way things work

3.  From the passage, we can conclude that________is the key to making a good leader.

A.  developing one's emotional intelligence

B.  in fluencing others in one's own way

C.  producing some unexpected results

D.  having confidence in one's ability

4.  This passage is most helpful to those who________.

A.  have strength and power

B.  are going to make a speech

C.  would like to be leaders

D.  are to be excellent employees

单项选择题