.what is a whiteboard.The use of whiteboards can replace some highly polluting experiments and dangerous experiments between toxic and hazardous substances. For example, in an experiment to learn the conditions of combustion, the principle of carbon monoxide reduction of copper oxide and ironmaking, white phosphorus combustion produces a large amount of white smoke, which is carried out in a ventilated kitchen; carbon monoxide is toxic and causes air pollution. These experiments are played in the classroom using video files for better results. In addition, video files can be stored for long periods of time and used for a long time. Most of the instruments used in the junior high school chemistry demonstration experiment are test tubes. An obvious experimental phenomenon cannot guarantee that every student can observe clearly. The students in the front row can still, but the students sitting behind are not easy to see. Over time, they will Make them lose interest in learning. Usually the teacher takes the test tube under the podium and walks two