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一、提出问题初中化学中定性探究了人体呼出气体中的氧气比空气中的含量少,二氧化碳比空气中的含量多的结论,呼出气体中的氧气、二氧化碳含量究竟是多少?如何用简便的方法测定二者的含量?这一直是笔者想知道、想研究的问题,更感兴趣的是想让中学生独立操作测定出呼出气体中氧气、二氧化碳的含量。二、研究过程1.研究思路对呼出气体中氧气、二氧化碳的含量测定的研究,就是尝试用自己学过的知识解决生活中的问题,实验要无污染,装置要简单,操作要简便,适合中学生单独操作。查阅了大量的资料后,发现呼出气体中氧气、二氧
First, the question raised Qualitative study of junior high school chemistry in the human body exhaled gas oxygen content less than the air, carbon dioxide than the air content of the conclusion, the exhaled gas in the oxygen, carbon dioxide content is how? How to use simple methods Determination of the content of both? This has always been the author I want to know, want to study the issue, more interested in wanting to operate independent high school students measured exhaled gas oxygen, carbon dioxide content. Second, the research process 1 research ideas on the exhaled gas oxygen, carbon dioxide content of the study, is to try to use their own knowledge to solve the problems in life, the experiment should be non-polluting, the device should be simple, easy to operate, suitable for high school students Operate alone. After consulting a large amount of information, it was found that the exhaled gas was oxygen and dioxygen