Case Study Of "Chemical Bond" Teaching In High School Chemistry Curriculum

Develop the core competencies of chemistry disciplinary is the core idea of the new round of general high school chemistry curriculum reform.The chemistry disciplinary core competencies is the concentrated embodiment of the value of discipline education and the fundamental requirement of moral education.The concept of "chemistry subject understanding" was put forward for the first time in the Chemistry Curriculum Standards for General High School(2017 edition).To carry out the "competency-based" chemistry classroom teaching requires teachers to enhance the understanding of chemistry subject.Through the literature research,the relevant studies of subject understanding at domestic and abroad are combed,analyze the research results and reference significance of the object,path,structural elements,characteristics and practical research of the subject understanding.Based on the theory of subject understanding,the original problem of the chemical bond(compulsory theme)is proposed as follows:what’s the interaction and cause of the atoms of the matter? The epistemic perspective are:the perspective of electrostatic action,the perspective of electronic,the perspective of energy.Based on the analysis of the subject understanding of chemical bond,the circle layer structure of chemistry classroom teaching,curriculum standards for chemical bond topics in high school chemistry courses,the content of different versions of chemistry textbooks in senior high school,construct the observation dimension of chemical bond classroom teaching from the original questions,epistemic perspectives,epistemic idea,migration and application.Select the representative compulsory theme "chemical bond" class example,analyze the classroom teaching content and performance of frontline teachers based on the constructed case-observation dimension.Through case analysis,find that most examples can put forward the original problems around the teaching content.In the epistemic perspective of chemical bond,less examples can focus on three epistemic perspectives.In the epistemic idea,the examples all start from the structure of atoms to understand the way that all the atoms are combined,but most of the examples are rest on the perspective of electronic,a small number of examples can integrate different epistemic perspectives to form a complete epistemic idea of chemical bond.In Migration and application,most examples still use the established concept of chemical bond to determine the type of chemical bond,bonding particles in compounds.The aspect of solving practical problems based on the established concept of chemical bond still need to be strengthened.Some teaching suggestions are put forward on compulsory chemical bond teaching based on case analysis.