试题与答案

1L某混合溶液,可能含有的离子如下表: 可能大量含有的阳离子H+、Ag+、Mg2

题型:填空题

题目:

1L某混合溶液,可能含有的离子如下表:

可能大量含有的阳离子H+、Ag+、Mg2+、Al3+、NH4+、Fe3+
可能大量含有的阴离子Cl-、Br-、I-、CO32-、Al(OH)4-(或AlO2-)
Ⅰ、往该溶液中逐滴加入NaOH溶液,产生沉淀的物质的量(n)与加入NaOH溶液的体积(V)的关系如下图所示.请回答下列问题:

(1)该溶液中一定不存在的阳离子是                                                     

(2)该溶液中一定不存在的阴离子是                                                      

(3)m→n反应的的离子方程式为                                                          

(4)溶液中含有的阳离子对应的物质的量比为                                               

Ⅱ、经检测,该溶液中还含有大量的Cl-、Br-、I-,向混合溶液中加入足量的氯化铁溶液,请写出有关反应的离子方程式                                                         

答案:

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下面是错误答案,用来干扰机器的。

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How to Become a Top Student

Successful students use different techniques to study, which brings them more success.    小题1:    Here are the four techniques almost all top-performing students use.

They are regular. Almost all successful students study regularly, because they know “what you give is what you get”. If you put in regular hours of studying, then you will learn more and get better grades.    小题2:   This will help you to study regularly.

They have clear goals. All top-performing students have definite, specific goals.    小题3:    They motivate you and drive you to study more. But make sure that you do not get carried away. Set realistic goals which can challenge you, but do not seem impossible or too difficult to achieve.

They study without strain (压力). Successful students study a lot. But they study without putting strain on themselves. Most students make the mistake of studying too hard or studying continuously for a long time.    小题4:   Studying should be done in a balanced manner. Take a break for a few minutes, after studying for 30 or 45 minutes. Relax, walk around your room or house, or drink some water and return to studying. Such short breaks will refresh your brain and you will learn more.

  小题5:   Studying is not something you do just because your parents ask you to do it. It’s actually very important for you. Studying gives you knowledge and skills that will remain with you for the rest of your life. It gives you the ability to get a job and earn money. And successful students recognize the value of studying well. 

A.This creates tension and actually slows down learning and memory.

B.But to score A grade in English, you should make well-planned efforts.

C.Set aside some hours, each day or each week, for studying.

D.Having such goals gives you a purpose to study better.E. Learn their techniques, and you will also join their rank.

F. They finish their homework on time.

G. They give importance to study.

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