Research On The Concept Of Chemical Conservation In Middle Schools And Its Evaluation

The aim of education is to promote the development of human beings,and it is the consensus of the educational circles all over the world to pay attention to the development of students' core competence.As far as the discipline itself is concerned,the construction of chemical basic concepts is an important driving force for the development of chemical core competence.Among them,the concept of chemical conservation is an important but relatively inadequate area.Therefore,this study focuses on the concept of chemical con-servation in middle school and its evaluation.The following is a brief introduction of the contents of this study.The first chapter is an introduction.This part introduces the background,the signifi-cance of existence and the related research status at home and abroad.The existing litera-ture shows that there is still much room for the study of the concept of chemical conserva-tion,especially in the definition and evaluation of its connotation.Chapter 2 is the theoretical study of the concept of chemical conservation.In order to fully and profoundly reveal the connotation of the concept of chemical conservation,this paper makes a thorough analysis from the relevant concepts such as "conservation" and"concept",and finally draws the conclusion that the concept of chemical conservation is the idea of "chemical conservation" established by people in the process of learning chem-istry and having a certain understanding of the knowledge of chemical conservation,which is embodied in the concept consciousness and ability of applying the "chemical conserva-tion relationship" in the process of further chemical learning and solving practical prob-lems.The way of thinking and the way of thinking to solve problems are manifested in the conscious consciousness or habit of thinking that individuals actively use the idea of chem-ical conservation to understand things and deal with problems.Moreover,the concept of chemical conservation is developing.After that,in order to perspective the development path of middle school chemistry conservative view and build a good theoretical basis for evaluation,on the basis of fully analyzing the knowledge development of middle school chemistry conservative view,referring to the revised Bloom educational goal taxonomy and the internal logic of core literacy development in the curriculum standard,the learning progress of middle school chemistry conservative view was constructed:Understanding the relationship of chemical conservation?Understanding the principle of chemical con-servation?Solving simple chemical problems by using the relationship of chemical con-servation?Comprehensive application of chemical conservation in complex chemical problems.The third chapter is the development of the observation and evaluation tools for the concept of chemical conservation in middle schools.Based on Rasch model,the test ques-tions were designed and compiled according to the development model of middle school chemistry conservation concept constructed in Chapter 2.After a round of test and im-provement,the high school chemistry conservation with good performance in reliability,error,separation,unidimensional test,item-person correspondence,data-model fitting,point-measurement correlation and other data indicators was obtained in the second round of test.Observation test tools.Chapter IV is the research on the development of the conservative view of chemistry in middle schools.Using the testing tools developed in Chapter 3,a large sample test was carried out.While further testing the quality of the tools,the development model con-structed in Chapter 2 was validated through actual testing,and the development character-istics of the chemical conservation concept in senior high school students were obtained.The test data were analyzed by SPSS,which showed that the development of the chemical conservation concept was not significantly related to gender,but changed with the increase of grade.The change is remarkable.The fifth chapter is the summary of the study.This chapter systematically and com-pletely summarizes the conclusions of the whole study,the existing problems of this study are reviewed and the future development of this study is prospected.