论文部分内容阅读
人教版义务教育课程标准实验教科书九年级《化学》中,有三处应用磷燃烧的化学实验,它们均存在一定的缺陷。本文将这些实验改在试管中完成,使实验更简便、成功率更高、污染更小。一、测定空气中氧气含量实验的改进1.原实验的缺陷。原实验用燃烧匙盛红磷在密闭的集气瓶中燃烧,然后通过测量经导管进入集气瓶中水的体积
In the 9th grade “Chemistry” of the PEP Compulsory Education Curriculum Standards Test Book, there are three chemical experiments using phosphorus combustion. All of them have certain defects. This article will change these experiments in test tubes to make the experiment easier, with higher success rate and less pollution. First, the determination of the oxygen content in the air to improve the experimental 1. The original experimental flaws. The original experiment burned red phosphorus in a closed collection cylinder with a combustion spoon, and then measured the volume of water entering the collection cylinder through the conduit.