Research On The Evaluation Of Metamodeling Knowledge Of Senior High School Students In The Context Of Chemistry

Internationally,it has become one of the important goals of science education to cultivate students' abilities in modeling and modeling.In our country,with the development of new curriculum reform,cultivating students' core literacy has become an important goal in the field of education.The "evidence reasoning and model cognition" is listed as the core quality of chemistry discipline in the chemistry curriculum standard for senior high school issued in 2017,which fully explains the importance of model in chemistry discipline,thus arousing the attention and attention of teachers and researchers.By combing the literature,we can find that the main direction of current research is the teaching practice based on modeling.While the student-centered research focuses on the evaluation of modeling ability,especially the meta modeling knowledge.In order to cultivate students' meta modeling knowledge successfully,it is necessary to obtain the specific diagnosis information of students' understanding of model and modeling.However,the research tools used in the existing research are relatively simple.The most commonly used is the Likert scale questionnaire on the nature of scientific models,which does not involve the chemical content.Therefore,the research results may be universal and can not really reflect the students' understanding of chemical models and modeling.Therefore,the purpose of this study is to summarize the elements of meta modeling knowledge,build a meta modeling knowledge evaluation tool in the context of chemistry,analyze the understanding level of students,and make suggestions for model-based chemistry teaching.Specifically,the research issues of this study mainly include the following:(1)What are the connotation and components of meta modeling knowledge?(2)How to test students' understanding level of meta modeling knowledge in the field of chemistry?(3)Is there any difference in the performance of metamodeling knowledge of senior high school students in different dimensions?(4)Does context have an impact on senior high school students' understanding of meta modeling knowledge in the field of chemistry?On the basis of literature review,the theoretical framework of this research is determined.The theoretical framework divides meta modeling knowledge into five aspects and three levels,including model essence,model purpose,model diversity,model testing and model modification.Level 1 and level 2 refer to the "description" of the model,level 3 refers to the "predictability" of the model.reflecting the scientific perspective of the model as a research tool.Based on this framework,this study determines the different contexts of various aspects of meta modeling knowledge from the perspective of multiple classification of chemical models,so as to ensure that the models widely used in chemistry are included.After the preliminary construction of the questionnaire of meta modeling knowledge survey,further modification and optimization are made through expert consultation and small sample test.In the formal test,students from six parallel classes of senior two in a middle school were selected as samples to collect and analyze the data.The conclusions of this study are as follows:(1)On the whole,the overall understanding level of meta modeling knowledge of sophomores is 2.28,which is between level 2 and level 3,showing a good performance.There is no significant difference between boys and girls in understanding level,which shows that gender has no effect on students' understanding level of meta modeling knowledge.There is no significant difference in the overall understanding level of meta modeling knowledge among students with different academic achievements,which reflects that the overall level of meta modeling knowledge of students is the same.(2)From different aspects of meta modeling knowledge,students have different levels of understanding of all aspects of meta modeling knowledge.The understanding level of students in testing model is significantly higher than the other four aspects,and the understanding level of model essence and model purpose is the lowest.This shows that the development of understanding level of five aspects of meta modeling knowledge is not synchronous,that is,students do not acquire these knowledge in a single overall process,but must develop knowledge related to each unique aspect to cultivate students.(3)From the perspective of the influence of context on the understanding level of meta modeling knowledge,there are significant differences in the understanding level of five aspects of meta modeling knowledge in different contexts,which shows that the understanding level of students' meta modeling knowledge is closely related to the context.In terms of model nature,model purpose and model diversity,students' understanding of contextualized task is better than that of non contextualized task.In terms of test model and modification model,students' understanding in general context is better than that in context task.Specifically,in terms of model nature,the best context may have the characteristics of micro level,such as electronic layer model,which can be used as a good context for model and modeling knowledge training.In terms of the purpose of the model,due to the accuracy and strong prediction ability of the mathematical model itself,it may be the best context for the understanding level of the model,such as the ideal gas state equation,chemical equilibrium constant and other models.In terms of the diversity of models,the more abstract theoretical model may be the best context to cultivate the diversity knowledge of models.In terms of testing model and modifying model,students' overall understanding is better than specific model in specific context.It reflects that students have a better understanding of these two aspects of the general chemical model,but they have a lower level of understanding in the specific context.In terms of test model,the best context is not detected in the given context,which needs to be explored constantly.In the aspect of modifying the model,compared with the general model,students choose Level 3 more frequently in the context of benzene molecules,which to some extent shows that it is the best context.