演示实验是以教师为主的表演和示范操作 ,它是指导学生观察和思考的实验 ,有助于学生直观、形象、生动、深入浅出地理解概念、化学原理及其变化规律 ,还有助于促进学生化学素质的提高和创造性潜能的开发。而不同教师的实验演示可能会收到不同的效果 ,所以精心安排实验 ,巧妙布 Demonstration experiment is a teacher-oriented performance and demonstration operation. It is an experiment to guide students in observation and thinking. It helps students to understand concepts, principles of chemistry, and their changing laws intuitively, vividly, vividly, and in a profound manner. It also helps to promote The improvement of students’ chemistry quality and the development of creative potential. While the experimental demonstrations of different teachers may receive different effects, so the experiment is arranged meticulously.