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人教版教材九年级化学第七单元课题1“燃烧和灭火”中有关燃烧条件这一实验存在以下问题:白磷燃烧产生的白烟直接排入空气,污染环境;白磷燃烧只能看到火星,不能看到火焰,不利于学生对燃烧现象的描述;不利于学生分组实验等。改进后的实验利用锥形瓶、吸滤瓶、铜线圈、洗气瓶等物品进行创新设计,有如下优点:用铜线圈装红磷和白磷,使得两者与氧气接触更充分;在相对密闭的装置中进行,同时用氢氧化钠浓溶液吸收白烟,实验更安全、更环保;能看到白磷和红磷燃烧的火焰,现象更明显、更加有利于学生对燃烧条件的理解。
People’s Education Edition textbook ninth grade chemistry seventh unit subject 1 “combustion and fire” in the combustion conditions of this experiment the following problems: white phosphorus combustion directly discharged into the air, polluting the environment; white phosphorus combustion can only see Mars, can not see the flame, is not conducive to the students description of the phenomenon of burning; is not conducive to student group experiments. The improved experiment uses the conical flask, the suction filter bottle, the copper coil, the gas bottle and other items for innovative design, has the following advantages: with copper coil installed red phosphorus and white phosphorus, making both contact with oxygen more fully; relatively closed Of the device, while using sodium hydroxide concentrated solution to absorb white smoke, the experiment safer and more environmentally friendly; can see the white phosphorus and red phosphorus burning flame, the phenomenon is more obvious, more conducive to the students understanding of combustion conditions.