| The establishment of scientific models occupies an important position in contemporary science education and is the key content of science teaching activities.However,in middle school chemistry teaching,it’s found that students have great difficulties in understanding chemical models,which is mainly caused by the abstraction of subject knowledge and the lack of students’ modeling competence.The development of modeling activities can provide students with a meaningful learning experience,but they need to understand the complexity of the modeling process with help of a variety of different types of teaching situations.The development of information technology makes it possible to visualize phenomena that can’t be directly observed.This visual cognitive tool can be used in teaching practice to better help students understand abstract subject content.In teaching practice,we can integrate the virtual simulation situation created by information technology with the real-life situation and real experimental situation to form the learning situation of virtual and real combination.It provides a new opportunity for the development of modeling competence to explore the educational value contained in such learning situations through empirical research.Specifically,the main research questions of this study include the following three:(a)How to implement the learning situation of virtual and real combination in the teaching practice based on the development of modeling competence?(b)Compared with conventional classroom learning,how does the learning situation of virtual and real combination affect the development of students’ chemical modeling competence?(c)What is the development and evolution of students’ chemical modeling competence in the learning situation of virtual and real combination?To answer the above research questions,firstly,this study synthesizes the research results of modeling and computer simulation,and comprehensively analyzes the cultivation of modeling competence and the research status of teaching supported by computer simulation from the understanding of the essence of the model.Secondly,based on the Situated Learning Theory,Learning Progressions,and The Assessment Triangle Model,combined with the analysis of the modeling process based on literature research,an advanced framework for the development of chemical modeling competence is constructed.The chemical modeling capabilities are divided into four levels: Model selection,Model development,Model migration,and Model reconstruction.The analysis index system at each level is systematically described.This framework is the basis for subsequent classroom teaching and data analysis aimed at model building.The “learning situation of virtual and real combination” is defined as a learning situation that simulates the content which is difficult to realize or experience in the real classroom with the help of information technology,integrates it with the real and meaningful teaching situation,and helps students construct chemical models with the help of "real" macro and micro world phenomena.According to this,the modeling process is combined with scientific inquiry to design “the teaching mode of combination of virtual and reality in technology-enhanced learning situation”,and its teaching implementation and evaluation are discussed at the theoretical level.Furthermore,based on “the teaching mode of combination of virtual and reality in technology-enhanced learning situation”,the secondary development of the three chapters of "metals","solutions" and "common acids,bases,and salts" is completed.The “Modeling Competence Test of Junior Middle School Student” is developed to evaluate the modeling effect,an exploratory study was carried out on the research design,and the teaching plan and evaluation tools were tested and revised.Finally,this study adopts a mixed research method to conduct empirical research on the development of the modeling competence of students in four classes of Grade 9in H Middle School.From the quantitative and qualitative perspective,this study expounds on the development of students’ modeling competence in pre-,post-,and delayed post-test assessments,and discusses the development process of students’ modeling competence in the course of classroom teaching and interviews after the three evaluations.The results show that:(a)Based on the modeling process and scientific inquiry,the teaching mode of virtual and real combination has realized a significant impact on the improvement of students’ chemical modeling competence.And this effect is more significant in the “Model Development” and “Model Migration” phase,and can achieve a longer-term positive impact;(b)In terms of gender,this teaching mode is more effective in improving girls’ chemical modeling competence.The virtual simulation software can provide students with visual microscopic content and the conditions for experiments by human-computer interaction.These are more friendly to girls when they encounter abstract and complex content understanding in the modeling process;(c)In the research on the development and evolution of students’ chemical modeling competence,different performance modes of chemical modeling competence are obtained through qualitative induction.Through discussion,it’s found that the development of chemical modeling competence in the experimental group is more of a deep processing thinking mode based on logical reasoning,while some students in the control group still show a superficial way of thinking.According to the above mentioned,the whole research empirically tests the practical value of the theoretical framework constructed by the research for the development of students’ chemical modeling competence.And based on the development of students’ chemical modeling competence before and after teaching practice,combined with interviews and classroom analysis,the reasons for the change are discussed.It’s verified that the teaching mode of virtual and real combination can promote the development of students’ modeling competence,thus providing a valuable reference for the deep integration of information technology in chemistry. |
