问题 选择题

下列说法正确的是(   )

 

A.图甲表示某温度下,在溶液中达到沉淀溶解平衡后,改变溶液PH,浓度的变化。由图可知点溶液未达到饱和,因此,点的]小于点。

B.图乙表示在室温时用一定浓度的盐酸滴定V同浓度的氨水。点时溶液中=,且溶液中水的电离程度最大。

C.图丙表示在室温时,用溶液滴定30.00ml0.1mol/L

溶液,点a所示溶液中C()>

D.图丁可表示同体积同PH的某一元强酸溶液①和某一元中强酸溶液②分别与足量的锌粉发生反应生成随时间()的变化情况。

答案

答案:C

A:Ksp只与温度有关,不正确

B:b点时溶液呈中性,c(H+)=c(OH),由电荷守恒可知,c(NH4+)=c(Cl),但此时水的电离并不是最大:例如当酸碱恰好中和时溶液为氯化铵溶液,盐的水解促进了水的电离

C:此时酸碱恰好中和,溶液为醋酸钠溶液,由于CH3COO的部分水解,溶液呈碱性,正确

D:由于弱电解质溶液中存在电离平衡,在中和过程中可以不断电离出氢离子,故中强酸与锌反应的速率大且产生的氢气较多,两条线不能交叉,不正确

答案为C

阅读理解

When something goes wrong, it can be very satisfying to say, "Well, it's so-and-so's fault. "or "I know I'm late,  but it's not my fault;  the car broke down. "It is probably not your fault,  but once you form the habit of blaming somebody or something else for a bad situation, you are a loser. You have no power and can do nothing that helps change the situation. However, you can have great power over what happens to you if you stop focusing on whom to blame and start focusing on how to remedy the situation.This is the winner's key to success.

Winners are great at overcoming problems. For example, if you were late because your car broke down, maybe you need to have your car examined more regularly.Or, you might start to carry along with you useful phone numbers, so you can call for help when in need.For another example, if your colleague causes you problems on the job for lack of responsibility or ability, find ways of dealing with his irresponsibility or inability rather than simply blame the person.Ask to work with a different person, or don't rely on this person.You should accept that the person is not reliable and find creative ways to work successfully regardless of how your colleague fails to do his job well.         

This is what being a winner is all about-creatively using your skills and talents so that you are successful no matter what happens. winners don't have fewer problems in their lives; they have just as many difficult situations to face as anybody else. They are just better at seeing those problems as challenges and opportunities to develop their own talents. So, stop focusing on "whose fault it is." Once you are confident about your power over bad situations, problems are just stepping stop on for success.

小题1:According to the passage, winners           

A.deal with problems rather than blame others

B.meet with fewer difficulties in their lives

C.have responsible and able colleagues

D.blame themselves rather than others小题2:The underlined word remedy in Paragraph l is closest in meaning to        

A.avoid

B.accept

C.improve

D.consider小题3:When your colleague brings about a problem, you should           

A.find a better way to handle the problem

B.blame Nm for his lack of responsibility

C.tell him to find the cause of the problem

D.ask your boss for help小题4:When problems occur, winners take them as            

A.excuses for their failures

B.barriers to greater power

C.challenges to their colleagues

D.chances for self-development

单项选择题