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如何区分氧气氮气空气

更新时间: 2020-09-24 00:00:00     

将带火星木条伸入集气瓶中,如果无明显变化则为空气;如果木条复燃则为氧气;如果木条熄灭则为氮气。

原因是:氧气有助燃性,能使带火星的木条复燃;氮气不燃烧,也不支持燃烧,能使带火星的木条熄灭;空气中也有氧气,所以带火星的木条伸入瓶子后无明显变化。

关键词: 如何 区分 氧气 氮气 空气

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