化学是以实验为基础的自然科学,我国化学家傅鹰教授曾说过,只有实验才是化学的“最高法庭”。实验在学生构建化学基本概念和基本原理方面起着不容忽视的重要作用。因此,力求实验的完美和成功历来是教师和学生追求的目标,成功的实验固然有其教育价值,但失败的实验往往是不可避免的。教师或学生在实验中 Chemistry is experimental-based natural science. Professor Fu Ying, a chemist in our country, once said that only experiments are chemical “Supreme Court ”. Experiments play an important role that students can not ignore in building basic concepts and basic principles of chemistry. Therefore, the pursuit of perfection and success of experiments has always been the goal pursued by teachers and students. Although successful experiments have their educational value, unsuccessful experiments are often inevitable. Teachers or students in the experiment