义务教育课程标准实验教科书九年级《化学》上册第35页,还有课本中“活动与探究”第41页都有“铁丝在氧气中燃烧”的化学实验,其中都要求用螺旋状的细铁丝做实验。义务教育课程标准实验教科书九年级《化学》配套用书《初中实验报告册》的该实验习题中,有一问题是“铁丝盘成螺旋状的原因是什么?”学生在练习中也经常见到此问题,每当他们问到这个问题时,我都用手边的参考答案——“使后面的铁丝更靠近燃烧点去吸收热量,从而被引燃;增大与氧气的接触面积,使反应更易进行。”提供给他们参考。我经过反复实验和对比,认为:①“铁丝盘成螺旋状的原因”不能用如上所说解释,该解释不可靠;②该实验可以改进。我用 Compulsory education course standard experimental textbook ninth grade “Chemistry” on the first page 35, there are textbooks “activity and exploration ” on page 41 have “burn wire in oxygen ” chemical experiments, which require the use of spiral Shape of thin wire to do the experiment. Compulsory education curriculum standard experimental textbook Year 9 “Chemistry” supporting book “junior high school experiment report book” of the experimental exercises, there is a question “What is the reason why the wire coil into a spiral?” “Students often see in practice This problem, whenever they asked this question, I use the reference hand at hand - ”behind the wire closer to the burning point to absorb heat, which was ignited; increase the contact area with oxygen, so that the reaction Easier to carry. “Provide them with reference. After repeated experiments and comparisons, I thought: ”The reason why the wire coil is in a spiral shape" can not be explained as explained above. This explanation is not reliable. The experiment can be improved. I use