High School Chemistry Teaching "redox Reaction" Conceptual Change Research

The research of student's preconception and its conceptual change is an important topic of international scientific educational research. Through the analysis of the literature on the change of conception, it discovers that the following issues need to be solved further: to find out the preconceptions in students' minds, the characteristics and the process of students' conceptual change, and teaching strategies that should be adopted to promote students to change their preconception effectively and so on. Therefore, we select "redox reactions" to be our research object, based on the tracing research for one year, and puts forward the new findings that the process of conceptual change is composed by three stages: the initial acceptance of new concepts into the general concept, the understanding and integration of the concept, the application and development of the concept. Different students have different characteristics in the process of conceptual change. Excellent students undergo "progressive period - mutation period - plateau period". Most of the students go through "progressive period - plateau period - mutation period." The conceptual models prove that the psychological or cognitive structure is changing constantly, which is a dynamic process, and the concept maps strategy can promote students' conceptual change effectively.It gives teachers an inspiration that they must respect the characteristics of students and also follow the characteristics of the conceptual change when designing teaching procedures. On the other hand, teachers should realize that students' process of conceptual change is affected by the teaching strategies adopted by teachers, and effective teaching strategy will help promote students' conceptual change.