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从形式上看，Na2SO3和Na2CO3相似，那么Na2SO3和FeCl3之间的反应情况又如何呢？某化学研究性学习小组提出了两种可能：一是发生氧化还原反应：2Fe3＋＋SO32－＋H2O＝2Fe2＋＋SO42－＋2H＋；二是发生双水解反应：2Fe3＋＋3SO32－＋6H2O＝3Fe(OH)3(胶体)＋3H2SO3； 为了弄清楚发生的是那一种反应发生，同学们设计并实施了下列实验，请填写下列空白：
实验Ⅰ：实验用品 Na2SO3浓溶液、BaCl2稀溶液、稀盐酸、试管若干、胶头滴管若干。从选择的药品分析，实验者设计这个实验的目的是 。
实验Ⅱ：取5mLFeCl3浓溶液于试管中，逐滴加入Na2SO3浓溶液，观察到溶液的颜色由黄色变为红棕色，无气泡产生，无沉淀生成，继续加入Na2SO3浓溶液至过量，溶液的颜色加深，最终变为红褐色。这种红褐色物质是 。向红褐色物质中逐滴加入稀盐酸至过量，可以观察的现象是 。将溶液分成两等份，其中一份加入KSCN溶液，溶液变成血红色，反应的离子方程式为： 。另一份加入BaCl2稀溶液，有少量白色沉淀生成，反应的离子方程式为： 。
实验Ⅲ：换用稀FeCl3和Na2SO3溶液重复实验Ⅱ，产生的现象完全相同。
由上述试验得出的结论是 。 查看习题详情和答案>>
小题1:你介意我把窗户打开吗。
_______________________________________?
小题2:上海的人口比北京的要得多。
The population of people in Beijing than in Shanghai。
小题3:他说，早晨练习讲英语对学好英语是有好处的。
He said ___ _____ English in the morning ____ good ______ learning English well.
小题4:山不在高，有仙则名.
_____ _____ _____ ______ the mountain is, its name will spread far and wide if there is a fairy; '。
小题5:在我的成长过程中，我的父母总是随时给予我帮助。
My parents were always for me when I was up。
小题6:她比我要文静得多，且还聪明些。
______________________________________
小题7:比上不足比下有余
______ off than some, _______ off than many; to fall short of the _____, but be better than the _____.
小题8:有时父母把孩子的分数看得太重。
_____ parents ______ their grades too _________.
小题9:我们能期待从新闻上了解到世界各地所发生的事。
______________________________________________.
小题10:交警告诉那个司机不要再犯同样的错误。
The traffic policeman told the driver ____ ____ ______ _____ _____ _________anymore.
1阅读短文，然后用短文括号中所给词的适当形式填空。
Believe it or not: the more TV you watch, the 1. (little) happiness you get. This is the result of a new study. It shows that unhappy people watch more TV than happy people.
Well, you may say that you enjoy 2. (watch ) TV. In fact, TV gives you happiness for a short time, but unhappiness for a long time.
Why? It is because, if you watch TV, you cannot take part in many other good 3. (activity). And sometimes, if you are unhappy, you 4. (usual) prefer being a couch potato(整天坐在沙发上看电视的人)，right? Watching TV is relaxing to you.
Then if you want to be happy, what should you do? You can read newspapers, visit 5. (you) friends, go to parties, … but don’t watch television all the time. Now turn off the TV, and take a walk outside. It’s the 6. (one) step to being happy!
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阅读短文，然后用短文括号中所给词的适当形式填空。
Believe it or not: the more TV you watch, the 【小题1】 (little) happiness you get. This is the result of a new study. It shows that unhappy people watch more TV than happy people.
Well, you may say that you enjoy 【小题2】 (watch ) TV. In fact, TV gives you happiness for a short time, but unhappiness for a long time.
Why? It is because, if you watch TV, you cannot take part in many other good 【小题3】 (activity). And sometimes, if you are unhappy, you 【小题4】 (usual) prefer being a couch potato(整天坐在沙发上看电视的人)，right? Watching TV is relaxing to you.
Then if you want to be happy, what should you do? You can read newspapers, visit 【小题5】 (you) friends, go to parties, … but don’t watch television all the time. Now turn off the TV, and take a walk outside. It’s the 【小题6】 (one) step to being happy!
Believe it or not: the more TV you watch, the 78 (little) happiness you get. This is the result of a new study. It shows that unhappy people watch more TV than happy people.
Well, you may say that you enjoy 79 (watch ) TV. In fact, TV gives you happiness for a short time, but unhappiness for a long time.
Why? It is because, if you watch TV, you cannot take part in many other good 80 (activity). And sometimes, if you are unhappy, you 81 (usual) prefer being a couch potato(整天坐在沙发上看电视的人)，right? Watching TV is relaxing to you.
Then if you want to be happy, what should you do? You can read newspapers, visit 82 (you) friends, go to parties, … but don’t watch television all the time. Now turn off the TV, and take a walk outside. It’s the 83 (one) step to being happy! 查看习题详情和答案>>