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九年级学生初次接触化学知识,形成良好的学习兴趣对今后的学习有重要意义。化学实验是提高学生学习兴趣的有效途径之一。因此,实验现象明显且富有可操作性是实验课的最佳选择。现行的人教版教材中几个演示实验存在现象不明显、不易操作、产生有害气体等缺点。笔者在教学中经过多次改进、实验,最终得出比较有效的实验方案。一、改进实验一人教版九年级化学上册132面实验7-2,本实验意在向学生说明可燃物颗粒变小与氧气接触面积增大,燃
It is of great significance for the ninth grader to contact with the chemical knowledge for the first time to form a good study interest for future study. Chemistry experiment is to improve students’ interest in learning one of the effective ways. Therefore, the experimental phenomenon is obvious and full of operability is the best choice for experimental class. The current version of the teaching of PEP textbooks in several demonstrations of the phenomenon is not obvious, not easy to operate, resulting in harmful gases and other shortcomings. After many improvements in teaching, experiments, and ultimately come to more effective experimental program. First, to improve the experimental one-person version of the ninth grade chemistry on the 132 side of the experiment 7-2, the experiment is intended to show students that the combustible particles become smaller and oxygen contact area increases, burning