1改进的原因人教版九年级化学上册关于探究“燃烧条件”的实验,见教材第142页。虽然现象比较明显,但存在以下不足:一是对未燃烧的红磷没有创造条件使其燃烧,不能很好地说明可燃物燃烧与着火点有关; 1 reasons for improvement PEP 9 grade chemistry on the exploration of “burning conditions” experiment, see textbook 142. Although the phenomenon is obvious, the following deficiencies exist: First, there is no condition for unburned red phosphorus to burn, which can not well explain the combustion of combustibles and the ignition point;