化学是一门以实验为基础的学科,通过生动、鲜明、新奇的实验现象引发学生的学习兴趣,使学生产生强烈的学习动机,让学生形成一定的观察能力、思维能力与创新精神,从而达到较好的教学效果。“分子和原子”这一节是学生由宏观世界进入微观世界的开始,也是解决化学教学难点——对宏观的现象进行微观解释的关键。但由于这一部分知识比较抽象,处理不当就会削弱学生的学习兴趣,成为学生学习的分化点,如何解决这个教学难点?笔者设计了以下几个实验,希望 Chemistry is an experiment-based discipline that arouses students ’interest in learning through vivid, vivid and novel experimental phenomena so that students have a strong motivation to learn and develop students’ ability of observation, thinking and innovation so as to achieve Good teaching results. The section on “Molecules and Atoms” is the beginning of the students entering the microcosm from the macro world and the key to solving the difficulty of chemistry teaching - to give a micro explanation of macro phenomena. However, because of this part of the knowledge is more abstract, improper handling will weaken students’ interest in learning, become the dividing point of student learning, how to solve this teaching difficulty? I designed the following experiments, hope