Research On The Evaluation Of Chemical Structure Ideas Of Senior High School Students

The purpose of chemistry teaching is not only to impart knowledge of chemistry to students,but more importantly,to cultivate students' basic concepts of chemistry,so that students can consciously use chemistry viewpoints to analyze and solve problems,and improve their core literacy of chemistry.Promote the all-round development of students.As the core of chemical theory,the structure of matter is to explore the nature of matter and its changing laws from the perspective of microstructure,focusing on the structure of atoms,molecules and crystals,and the relationship between structures and properties.The structural view is one of the important basic concepts of chemistry that high school students should have.The construction of the chemical structural view is very important for the development of students' "macro-recognition and microanalysis" of the core quality of chemistry.However,at present,because the content of high school structure content is not much,and most of them are concentrated in the second half of the high school section,there are relatively few researches on the structure view.Therefore,this study will analyze the connotation and basic content of the chemical structure view,and carry out an evaluation study on the level of the chemical structure view of high school students.First,carry out theoretical research on the view of chemical structure.In order to reveal the connotation of the chemical structure view,the basic concepts such as "structure","chemical structure" and "chemical structure view" are analyzed.The view of structure refers to the fact that students have learned the knowledge of chemical structure and are on the basis of deep understanding of chemical structure.General understanding of chemical substances and their structures obtained from the above.Specifically,the structure of matter has different hierarchical scales,the existence of different interactions between particles,the existence of different spatial arrangements between particles,and the structural characteristics of matter at different scales affect the properties of matter.Then,through the analysis of the knowledge content of the structure of the chemistry curriculum standard of junior and high school,combined with Bloom's educational objective taxonomy,the view of chemical structure of high school students is divided into knowing simple chemical structures,understanding the principles of structure,analyzing the relationship between structure and properties,and comprehensively using structure.The viewpoint solves four levels of complex problems,and proposes specific behaviors corresponding to each level.In the evaluation research,according to the level of structural view,the chemical structure observation tool for high school students is compiled,and through the preliminary test,the Rasch model is used to perform various quality tests such as reliability and validity test,one-dimensional analysis,and project fitting analysis.In response to the problems found,the test questions were adjusted and improved,and finally a high school student chemical structure observation tool with good quality indicators was obtained.Using testing tools,301 senior high school students in three regions of Shandong Province were tested on the structural view.The evaluation results found that the number of senior high school students with a view of chemical structure increased from low to high,only a very small number of students were at level one,and most senior high school students were at a higher level.In addition,SPSS software was used to analyze the relationship between structural view and school type and gender,and it was found that the relationship between the level of chemical structure view and gender and school type was more significant.The structural view level of boys was significantly higher than that of girls,and key high school students The level of structural view is significantly higher than that of ordinary high schools.The innovation of this research is to define the connotation of chemical structure view,divide the four levels of chemical structure view and behavior performance of high school;use Rasch model to develop testing tools,and test the level of chemical structure view of high school students Through the analysis of the test results,the current status of the development level of the chemical structure view of high school students is obtained,and teaching suggestions are put forward.