Practice Research Of Developing About Chemical Reaction Classification Pedagogical Content Knowledge

Teacher’s pedagogical content knowledge (PCK) is the coreproblem of the development of teachers’ professional development, f-or the chemical teachers,PCK mainly include chemical scientific und-erstanding of chemical knowledge,about the teaching strategy andthe characterization of the students understand chemical knowledge, a specific subject, chemistry knowledgeabout chemistry curriculumbased on the knowledge. Classification of chemical reaction chemis-try teachers teaching knowledge is the specific content of theteaching knowledge, teachers will not only affect the teachingbehavior and theprofessional development of its scientific understan-ding of the chemical reaction, will also affect the students to unders-tand the classification of knowledge, teachers to enhance their che-mical knowledge classificationteaching level, need to construct anddevelopment in practice in the. The research on the developmentof teachers’ classification of chemical reaction of teaching knowled- ge, and solve the main study on three basic problems:(1)high schoolstudents for the classification of chemical reaction to understandthe problems and reasons;(2) the effective teaching strategy andtherepresentation of classification of chemical reaction content, pr-omotion of selfprofessional development;(3) promote high a new un-derstanding of the chemical reaction classification.In this paper, the ion and redox reactions as the teachingcontents,investigation and study, carries on the present situation ofstudents ’ chemical reaction of classification learning investigationshows that, for some problems existing in students learning ofchemical classification of knowledge, mainly in four aspects:(1) thestudents are lack of basic knowledge;(2) the studentsare not verygood the understanding of the chemical reaction concept fromnature, the lack of scientific understanding of the micro level;(3) notestablished thinking and cognitive thinking model of science, a lackof awareness of the chemical science concepts;(4) the students arenot clearclassification of chemical reaction value. This reflectsthe existence of teachersteaching problems:(1) the concept ofteaching problems;(2) the lack of teaching culture construction met-hod of thinking and cognitive thinking model;(3) lack of the conceptof teaching;(4) no obvious value classification of chemical reactionknowledge teaching;(5) the lack of student teaching. On the basis of investigation and research, the research ofteaching practice,with the M and N classes for teaching object, thei-on and redox reactions of teaching practice for the teaching contents, mainly based on the classification of chemical reaction knowledgeteaching, thinking training, teaching and research of the chemicalconcept teaching research and knowledge valueresearch andteaching. Practice shows that, after the continuous improvement ofteaching,"I" has developed to understand the classification ofchemical reaction of teaching knowledge, and helps the studentsto understand theclassification of chemical reaction and enhance thelevel of knowledge,enhance the ability of application. UsingSPSS17.0, the grade one and grade two students made a comparativeanalysis of the chemical reaction to understand the classification ofknowledge, found that after the improvement of teaching, student pe-rformance improved significantly, the "chemical reaction" developm-ent of classification of teaching knowledge, promote studentsto understand. Through the research, the main conclusion is that:1."I" has been developed in classification of chemical reactionand teaching knowledge, specifically manifested in: improves the cl-assification of chemical reaction knowledge of scientific understand-ing; deepen the understandingabout the students to understandthe chemical reaction of classification of knowledge; in the classific- ation of chemical reaction course knowledge and improve the trans-formation ability; teaching strategies and characterization ofpowerhas increased.2."I" chemistry knowledge classification teaching developmentpromotes the development of students’ understanding, enhance thestudents understanding of the concept and classification of chemicalreaction knowledge contains basic chemistry concepts and chemic-al law, constructs the basic cognitivethinking mode;3. This paper puts forward effective strategies, chemical reactionclassification pedagogical content knowledge development includes:(1) constructing a cognitive thinking model based on knowledgesystem, promote the formation of PCK development of teachers tea-ching thinking style;(2) pay attention to students’ understandingof the classification of knowledge for chemical reactions, the deepanalysis of study situation;(3) the development ofchemistry curricul-um knowledge classification and knowledge integration,improvethe transformation ability;(4) teaching practice and teaching practi-ce,and construction of PCK.