“温故而知新”.有效的巩固,既能基于广度,达到高度,产生效度,也能留下余度.对教师而言,明确章节知识点与构建知识网络是基本专业要求.但对学生而言,时间紧,任务重,化学知识点散而多.采用何种模式,才能激发学生的兴趣,注入课堂活力,提高科学素养是值得教师思考的问题.下面以“溶液”复习教学为例谈点体会.一、充分准备,呈现问题溶液是初中化学的重要内容之一,也是溶液中酸、碱、盐间反应的载体.课前准备:将溶液的内容 “To know the old cause of the new.” Effective consolidation, both based on breadth, reach a high degree, produce validity, but also leave redundancy.For teachers, a clear knowledge of chapters and build knowledge network is the basic professional requirements. However, for students, the time is tight, the task is heavy, chemical knowledge and more scattered.What kind of model used to stimulate student interest, into the classroom vitality, improve scientific literacy is worth the teacher to think about the problem to the following “solution ”Reviewing the teaching as an example to talk about experience .A fully prepared to show the problem solution is an important part of junior high school chemistry, but also the solution of acid, alkali, salt reaction carrier .Pre-class preparation: the solution content