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木炭还原氧化铜的实验改进

2012-11-21 23:10:56| 分类：教材研究 | 标签： |举报 |字号大中小订阅

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“木炭还原氧化铜”的实验创新

文章体裁：化学论文作者：佚名整理编辑：点灯的心

木炭还原氧化铜的实验改进- 点灯的心 - 刘振中初中化学工作室

人教版初中化学教材上册第 111 页，《木炭还原氧化铜》的实验装置图中存在一点疑惑。人教版中《用木炭还原氧化铜》装置图如下所示：

『修改原因』

依据固体粉末在加热时易冲入导管堵塞原则，再结合高锰酸钾固体粉末制取氧气时也在试管口放了一团棉花的实例，而木炭还原氧化铜的实验中，木炭和氧化铜也都是黑色粉末固体，可想而知，应该在试管口放一团棉花以防堵塞。

在高锰酸钾制取氧气的实验中，为了防止水倒流回试管造成试管破裂，停止反应前是先撤水槽后熄灭酒精灯的。同样，《木炭还原氧化铜》的实验装置图与高锰酸钾制取氧气的装置图类似，当然，为了防止水倒流回试管也是先撤出导气管，后熄灭酒精灯。问题是，当撤出导气管的同时（采用上图实验装置），那么，大气中的空气就会逆流回灼热的试管内与试管内的物质混合，而试管里有刚刚反应生成的红色固体铜，灼热的铜又重新在高温下被空气中的氧气氧化为原来的氧化铜取裵e.Qmdj1s$"取哑室" s该在试管谟�3bsp> 混合-e cl⒏崭辗，只要把烫宸封闭起来就可以了: 2em;" >在高锰酸钾制取氧气的实验中，卧颉�&TRONG>方法V> -INDENT: >

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