Teaching Exploration And Research On The Learning Progression Of Chemica Particle View In Junior Middle School

Grade Nine in junior high school is the beginning of students’ systematic study of chemistry.The contents needed to master this year are various and scattered.How to make students master the core knowledge of chemistry in such a short time effectively,pave the way for the high school chemistry learning is the concern and thinking of every junior high school chemistry teacher.The macro identification and micro analysis of matter is one of the core qualities of chemistry.The understanding of the view of particles can help students explore the essence of the world more clearly.The macro world and the micro world interact and influence each other.The macro change is determined by the micro structure,and the micro change is reflected in the macro form.Therefore,the formation of particle view is not only conducive to students’ deeper understanding and explanation of macro facts and phenomena,but also promotes students’ forming of the thinking mode of chemistry subject with triple representation.Among them,the content of “molecule and atom” is the basis for students to learn the structure of matter in the future.The cognition of molecule and atom can help junior high school students better understand the law of conservation of mass and the law of change of matter.It also provides an advanced starting point for the subsequent study of particle view.Therefore,this paper will focus on exploring the possible construction process of PEP chemistry “molecules and atoms” in the process of junior middle school basic education,and provide reference for cultivating this concept.In order to know more about the current situation of advanced learning of particle view in junior high school chemistry,the author first collected a lot of information,including the chemical curriculum standards,junior high school physics textbooks(PEP)and the relevant content of particle view in junior high school and senior high school chemistry textbooks,then sorted out the research status of advanced learning of particle view.It is found that the relevant researches are mainly in the stage of theoretical research and lack of educational empirical studies.And most of the researches focus on senior high school chemistry,few researches are about junior high school chemistry.Based on this situation,the focus of this study is on the design of advanced learning of molecules and atoms in junior high school chemistry.Secondly,the author interviewed some chemistry teachers in junior high school,and conducted a preliminary questionnaire survey in two classes to know students’ early level of particle view in junior high school.By sorting out and analyzing the results of interview survey and questionnaire survey,this paper predicts the advanced goal,constructs the advanced dimension,subdivides the teaching goal of each lesson,and carries out teaching designs.Finally,taking the chemistry textbook(PEP version)of Grade Nine as the blueprint,the author lists the teaching design of three lessons about “molecules and atoms”,and introduces the teaching process in detail.Teachers analyze students’ cognitive level after each lesson,including data collection,data analysis and data feedback,which also provides corresponding support for subsequent teaching.Through the author’s comparative practice of the two classes,it is proved that the conscious and coherent core concept teaching can improve the students’ understanding of the essence of science from scattered to simplified integration,from the reality of life to scientific knowledge,from the basic appearance to the essence of science.