In chemistry teaching, most students feel abstract and difficult to understand the knowledge about the microstructure of matter because of the imperceptible nature of microscopic particles and their combination, movement and arrangement. For example, although we can explain the problem of "electron cloud" in the section of "the movement state of electrons outside the nucleus" through the photos in the textbook, we can also use related models for intuitive teaching, but the actual effect is not ideal. The former will make students mistakenly think that the motion of electrons has certain rules because there is no motion, while the latter will make students mistakenly think that atoms are solid geometry. In order to make the extranuclear electrons move, we made a small courseware "The Movement of Extranuclear Electrons Around the Nucleus". Firstly, the phenomenon of "visual persistence" and its application in film and animation production are briefly introduced. Then, some macro-objects' movements and various gif animations simulating the movement of electrons around the nucleus are made, so that students can truly feel the visual impression of matter at different speeds, and know and understand the characteristics and description methods of electron movement.

In addition, the multi-view animation or three-dimensional images made with 3Dmax can also show the structures and molecular models of various crystals widely. The use of these three-dimensional structure courseware can effectively help students form the spatial imagination ability of chemical substances and learn to analyze the microscopic composition of substances from the perspective of quantity.

Experiment is the basis of chemistry teaching. The survey shows that the efficiency of teachers' 45-minute theoretical presentation in classroom teaching is far less than that of a 5-minute experimental demonstration. However, there are also many problems in classroom experimental teaching, such as the phenomenon and effect of some experiments are not obvious; Some experiments are repetitive and time-consuming, so it is difficult to call them at any time in class. In addition, some experiments are too polluted to be completed in the classroom. The extensive application of experimental courseware can effectively help teachers overcome many problems in teaching and improve experimental efficiency. For example, in the teaching of "the influence of pressure on chemical equilibrium", the influence of changing pressure on the transformation between nitrogen dioxide and nitrogen tetroxide is not significant. Using textbook experiments, students can usually notice that the color of pressurized mixed gas is deepened, but they often can't find that the color is slightly lighter afterwards. Because according to people's visual characteristics, the phenomenon from shallow to deep is easy to identify, while the phenomenon from deep to shallow is not easy to perceive.

Therefore, we made the prototype simulation and simplified simulation animation courseware of the teaching material experiment by using 3Dmax, which consciously highlighted the change of gas color and enhanced the level difference of phenomena in the experiment. At the same time, the use of two gif animations about the influence of pressure on the concentration and the number of gas molecules in the courseware deepens students' understanding of gas color change and component concentration change in the process of pressure change, and lays a foundation for understanding Le Chatelet's principle.

The application of multimedia courseware in classroom teaching has opened up a broad new world for chemistry teaching.