High School Chemistry Before The Concept Of Diagnosis And Teaching

Students have formed ideas to things and phenomenon before learning new knowledge officially. Or in the process of studying , students produce the new ideas which are not consistent with scientific ideas, these ideas are called preconception in the viewpoint of psychology. Preconception plays an important role in conception-studying of chemistry, the research in preconceptions is also advanced problem in the field of chemistry teaching psychology.Many researches show that, when they learn new knowledge, students try to connect text content with their original knowledge that is individual point and modle, and they think them are "practicable" and "reasonable" in explaining and judging the daily phenomena and facts, so they often hardly give up or change them, and among teaching practice, many students refuse to change their ideas despite of being taught repeatedly. And students' original views and points are potential, spontaneous and unobservable, so, to our teaching, how to inquire preconcetion, and which teaching tactics can be adopted to help students change them, have been urgent problems to be solved.So under the guidance of theory of constructivism, we inquire and analyse preconception of students in senior middle school, which in "the redox reaction" , "the material structure" as well as "the chemical equilibrium" .The research discovered that, in these three parts , students have the massive preconceptions, which have effects on forming correct scientific concept. The research indicated that, teachers generally neglect preconceptions of students in the concept teaching, and lack the diagnostic method and technology, also the corresponding teaching strategy. The research also indicated the research technique and tool that this article utilizes are effective, and provides the demonstration and instruction for teachers in chemistry teaching to diagnose students' preconceptions. Also discussed teaching strategy of conceptual transformation based on the students' preconception, and provided one kind of new teaching mentality for the traditional concept teaching.