某学生设计了一套如图所示的简易气体发生装置。试回答：
（1）装置中小试管的作用是： 。
（2）这套装置可用来制备什么气体？ 。
（1）使长颈漏斗下端管品浸入液面下 （2）H2或CO2
题目分析：（1）右上图装置使用注意事项中有一点：长颈漏斗的下端要伸入液面以下（即要形成液封），所以装置中小试管的作用是：使长颈漏斗下端管品浸入液面下，这样可以节约药品
（2）根据反应物的状态和反应条件选择发生装置，此装置是常温下固液反应，所以可用过氧化氢溶液和二氧化锰制氧气，也可用锌和稀硫酸制氢气，用石灰石与稀盐酸制二氧化碳
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| How 1 do you know about manners (礼仪)? Different countries have 2 manners. In 3 Asian countries, it is good manners to take off your shoes before you go into a house. 4 in European (欧洲) countries, even if they sometimes become very dirty, this is not done. If you are a 5 in a Chinese house, when you have a meal, you usually do not 6 the food. You often leave a little to 7 that you have had enough. But in England, a visitor always finishes food to show that he has 8 it. We must know the customs (风俗) of other 9 so that they will not think 10 bad-manners. People all over the world 11 that a well-mannered person should be kind and 12 to others. If you remember this, at 13 you will not go very far wrong. 14 likes a person with good manners, but no one likes a person 15 bad manners. Keep your manners. |
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