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kong qi zhong yang qi han liang ce ding shi yan de gai jin
Pages: 35-36
Year: Issue:  4
Journal: Experiment and Equipment for Primary School

Abstract: 1 前言 初中化学《测定空气中氧气的体积分数》的实验,目前在各种教材中介绍的方法有两种:原版教材是用钟罩、水槽等装置,燃烧红磷法;现行教材采用广口瓶、烧杯、长导管等装置,燃烧红磷法,如图1所示.两种方法的共同点是用红磷燃烧消耗容器中的氧气产生负压,使水进入容器,证明空气中含氧气的体积约占空气体积的1/5,但在实际实验过程中存在问题.
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