问题 填空题

高铁酸钠的化学式为Na2FeO4,按要求回答下列问题:

(1)高铁酸钠主要通过如下反应制取:

,则X的化学式为_____________。

(2)高铁酸钠是一种新型净水剂,在水中可以发生如下反应:

。由此看来,高铁酸钠能够杀菌消毒是因为它具有________性,而能够除去水中悬浮物是因为__________。

(3)FeO42-在水溶液中的存在形态如图所示。向pH=8的这种溶液中加KOH溶液,发生反应的离子方程式为___________________。

(4)高铁电池是一种新型可充电电池,电解池为碱溶液,其反应式为

则电池正极材料是_________,充电时电池正极________(填“得”“失”)电子,放电时电池的负极反应式为___________。

答案

(1)NaCl

(2)氧化性;生成的Fe(OH)3,在水中形成胶体能吸附水中的悬浮杂质

(或

(3)

(4);失;

完形填空

小题1:___You probably think you will never be a top student. This is not necessarily so, however. Anyone can become a better student if he or she wants to. Here’s how:

Plan your time carefully. When planning your work, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First your time for eating , sleeping, dressing, etc. Then decide a good, regular time for studying. 小题2:____ A weekly schedule may not solve all your problems, but it will force you realize what is happening to your time.

Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television. When you sit down to study, concentrate on the subject.

Make good use of your time in class. 小题3:____Listening carefully in class means less work later. Taking notes will help you remember what the teacher says.

Study regularly. When you get home from school, go over your notes, review the important points that your teacher is going to discuss the next day, read that material. 小题4:_____If you do these things regularly, the material will become more meaningful, and you’ll remember it longer.

Develop a good attitude towards tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won’t end if you don’t pass a test, so don’t be over worried.

小题5:_____ You will probably discover many others after you have tried these.

A.There are other methods that might help you with your studying.

B.Don’t forget to set aside enough time for entertainment.

C.Take advantage of class time to listen to everything the teacher says.

D.No one can become a top student unless he or she works hard.E. Maybe you are an average student.

F. Make full use of class time to take notes of what the teacher says in class.

G. This will help you understand the next class.

单项选择题