怎样突破分子这个教学难点,顺利帮助学生建立分子的概念,并用分子的观点去分析物质的构成是初中化学教学中不易处理的一个教学难点.这要求教师精心设计创设教学实验和问题情境,引领学生逐层突破教学难点. How to break through the difficult teaching of molecule, successfully help students to establish the concept of molecule and analyze the composition of matter from a molecular point of view is a difficult teaching point in junior high school chemistry teaching, which requires teachers to carefully design and create teaching experiments and problem situations to lead students Break through teaching difficulties layer by layer.