大凡从事过初中化学教学的人都有过这样的体会:自己已经很努力的教了,学生也已经很努力的学了,但效果却总是不理想——讲过的实验学生一做还是手忙脚乱,漏洞百出;强调过多次的概念、公式,到了题中还是不会运用;讲 Everyone who has ever engaged in junior high school chemistry teaching has had the experience that he has taught very hard and students have worked very hard to learn but the result is always unsatisfactory. , Full of loopholes; stressed that many times the concept of formula, the question or not to use;