The Research On Sudents' Cognitive Development Of Electrochemistry

Chemical knowledge is a system consisting of many of the concepts, it is a complete system of knowledge, the concept of a single system of chemical knowledge, these organizations constitute a single through the middle school chemistry content. Electrochemical is secondary chemical content of the basic disciplines very important part of this study will explore the third year students, freshman students, senior students electrochemical representation of the basic concepts and application of electrochemical concept to solve the problem when existing differences so as to reveal the concept of students Representation and application of the impact of factors, and explore the concept of cognitive development of students electrochemical characteristics.In the course of the study of the ectrochemical representation, we mainly use tests and interviews with the students in different grades for the test to gather information, through data collection and materials analysis, finding the students' concept of representation methods becoming diversified. Students in different grades differ in different levels of representation. in different levels of representation, According to the study, we think that with the grade higher and the knowledge accumulated, students' concepts on basic electrochemical items change. students in lower grades haven't paid enough attention to the representation of the natural features of the items.Solving the problem is an important part in the students'cognitive process, also an important manifestation of the students' cognition on the items. Therefore, the paper focus on the empirical research in the application of electrochemical items. Through the analysis on the test results, we found that obvious diversity lies in the item application to solve problem among the students in three grades. The higher the grades are , the higher the level of the students' electrochemical item application is. The senior students in college have got a profound cogonition on the relationship among the items. When applicating the items to solve problems, they can be effective to take out such knowledge. The students in Grade 3 in high school, and those who are freshmen in college haven't reach such a cognitive level.In this paper, we also found that life experiences, teaching planing design take an impact to the representation of the concept, in the aspect of item application, students' understanding in the process of micro-electrochemistry is not enough, and students' cognitive structure of the "electrochemical" concept and its stability both affect the application of the items...