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探究可燃物燃烧的条件,是人教版化学上册第七单元的一个重要实验。原实验存在着明显的不足之处:①白磷燃烧产生的五氧化二磷是一种有毒的物质,扩散到空气中会污染环境,引起人体中毒。②热水中的白磷与氧气接触后燃烧,不易操作,有时需要做好几次才能成功,而且还要有氧气发生装置,比较复杂。为了克服这些不足,我们对该实验进行了创新和改进,收到了较好的教学效果。一、实验仪器及用品广口瓶、双孔塞、导管、大烧杯、易拉罐做成的支架、水槽、红磷、白磷、热水、冷水。二、实验装置改进后的实验装置如图1、图2所示。三、实验步骤和实验现象1.探究温度对可燃物燃烧的影响
Exploring the conditions of combustibles burning is an important experiment of the seventh unit of the PEP. There are obvious shortcomings of the original experiment: ① phosphorus pentoxide produced by combustion of white phosphorus is a toxic substance, which diffuses into the air and pollutes the environment, causing human poisoning. ② hot white phosphorus in contact with oxygen after combustion, not easy to operate, and sometimes need to be done several times to success, but also have oxygen generating device, more complicated. In order to overcome these deficiencies, we made innovations and improvements to the experiment and received good teaching results. First, the experimental apparatus and supplies Jar, double plug, conduit, large beaker, cans made of cans, sink, red phosphorus, white phosphorus, hot water, cold water. Second, the experimental device improved experimental device shown in Figure 1, Figure 2 shows. Third, the experimental procedures and experimental phenomena 1. To explore the impact of temperature on combustibles combustion