鉴于化学是初三的一门新课,且化学实验奇妙有趣,学生的学习兴致都很高,但是从第三单元的分子和原子开始,化学就从学生可以看得见的宏观世界进入到了看不见、摸不着的微观领域,抽象性的概念,陌生的术语,学生很难理解,无法把二者有机联系起来,更不会相互转化,以致于学习死记硬背,结果是一塌糊涂。如何帮助学生跨过此分水岭,树立微粒观,使学生初步理解化学现象的本质,已成为每位化学教师迫切需要解决的课题。 Since chemistry is a new lesson in the third day, and chemistry experiments are wonderful and interesting, students’ interest in learning is high, but from the molecules and atoms of the third unit, chemistry begins with the macroscopic world that students can see It is hard for students to understand and can not organically relate the two to each other, nor to the mutual transformation of the two so as to learn rote memorization and the result is a complete mess. How to help students across this watershed, establish the concept of particles, enabling students to initially understand the nature of the chemical phenomenon has become an urgent task for every chemistry teacher.