Research On Teaching Practice Of Chemical Modeling Based On Model Cognition ——Taking The First Class Hour Of "Hydrolysis Of Salts" As An Example

As early as the mid-19 th century,foreign countries began to study modeling teaching,while domestic research on modeling teaching started relatively late,and has now attracted the attention of domestic researchers.With the promulgation of the new curriculum reform policy,my country has vigorously promoted quality education,aiming to reflect the advanced educational concepts of "people-oriented" and "cultivating people",focusing on cultivating students' key abilities and necessary characters.The "General High School Chemistry Curriculum Standard"(2017)identifies "evidential reasoning and model cognition" as one of the core literacy of chemistry,and stipulates its connotation and specific requirements in the curriculum standard,which is also the development of students' modeling thinking and modeling.The important guiding ideology of ability.At this stage,the research on chemical modeling teaching is still insufficient.On the basis of literature analysis,this paper will understand the current situation of high school chemical modeling teaching through a questionnaire survey,and take specific teaching content as an example to complete the high school chemical modeling teaching design and implementation.Practice,improve and enrich the teaching cases of chemistry modeling in middle schools,hoping to cultivate students' core chemistry literacy of evidence reasoning and model cognition.Based on literature analysis and guided by new curriculum standards,this paper investigates the current situation of chemical modeling teaching,and proposes that the teaching mode of chemical modeling is mainly composed of six steps,including the creation of real situations and initial model building.The process of circulation,and taking the specific teaching content as an example to complete the modeling teaching design,implement the teaching practice,and combine the data analysis to evaluate the teaching effect.The first chapter understands the situation of chemical modeling teaching at home and abroad through literature analysis,understands the research background of chemical modeling teaching,and determines the research content,and proposes research ideas and research methods according to the shortcomings of domestic chemical modeling teaching.The second chapter sorts out the domestic and foreign research on modeling and modeling teaching,classifies the domestic literature on chemical modeling teaching in the past ten years according to the research content,and compares and analyzes the domestic and foreign literature from the three dimensions of research method,research content and research object.external research.The third chapter takes the literature analysis and curriculum standards as the theoretical basis,and based on the research needs of this paper,firstly defines the core concepts such as model,chemical model,and chemical modeling teaching,and then combines the curriculum standard and Bloom's goal classification.The cognitive level of students' models in high school is divided,and the types of chemical models specifically proposed in the curriculum standard are sorted out.The fourth chapter will design "Questionnaire on the Present Situation of Chemistry Modeling Teaching in Senior High School" on the basis of previous teaching research,analyze the results of the collected effective questionnaires and draw conclusions,and provide background reference for future teaching practice.The fifth chapter will take the first lesson of "Hydrolysis of Salts" as an example to sort out the types of chemical models included in it and carry out the teaching design of chemical modeling,and complete the teaching practice on this basis.The sixth chapter is to make a model cognitive water evaluation tool.Three chemistry teachers conduct teaching evaluation on the real teaching situation of the experimental class and the control class,and compare the students' model cognitive level.After the new class,a post-class test is conducted to compare Analyze the post-test score data of the control class and the experimental class to complete the evaluation of the teaching effect.Chapter 7 draws the conclusion of this paper based on the previous investigation and research,conducts research reflections and puts forward a prospect for the future.The research results of this paper preliminarily show that the chemical modeling teaching based on model cognition has a positive impact on students' chemistry learning,and has a certain role in promoting learning.Cultivating students' modeling thinking,improving modeling ability,and developing students' logical thinking ability also play an important role in improving students' chemistry performance.At the same time,chemical modeling teaching also provides reference for chemistry teachers,which helps to improve teachers' modeling awareness and modeling ability.