Study On The Teaching Strategies Of Particle View In "Acid,Alkali And Salt" Of Chemistry In Junior High School

The particle view is one of the important fundamental concepts in chemistry for junior high school.The construction of the particle view can help students develop microscopic thinking,learn them to understand the material world and explain macroscopic phenomena from a microscopic perspective,and then truly understand the material and the reactions between substances.The knowledge of acid,alkali and salt in junior high school chemistry is extensive,redundant,while the chemistry problems are comprehensive and difficult for students to understand.The knowledge points involving the particle view include the process of dissociation of acid,alkali and salt in water,the microscopic essence of neutralization reactions and the conditions for the occurrence of complex decomposition reactions,all of which are the key points in the knowledge of acid,alkali and salt.Therefore,teachers need to teach from a macro and micro perspective to help students develop and use the concepts of acid,alkali and salt.Based on this,this paper proposes the teaching strategies of particle view in "acid,alkali and salt" of chemistry in junior high school.This paper first analyses the connotation and current situation of the particle view on the basis of previous studies and scholars,then investigates the current situation of chemical particle view for teaching in junior high school chemistry through pre-test paper surveys and interviews to know the level of students' constructs of the particle view and to find the difficulties of students' learning through particle view:lack of basic knowledge of chemistry and poor mastery;inability to grasp the connection between macro and micro;inability to transform and link macros,micros and symbols;inability to think and solve problems from a micro perspective;lack of interest in learning.Based on the above researches and the practical situation of implementing teaching improvement on the related content of the particle view,relevant strategies to help students establish particle view in acid,alkali and salt learning are proposed.The first is to introduce experimental inquiry into the problem situation and go deep into the micro world.The second is to build models to narrow the distance between macro and micro.The third is to design teaching activities accurately to promote the construction of particle view.The fourth is to use the Seewo whiteboards properly to make teaching design interesting,life-oriented and competitive.The fifth,the particle view is constructed step by step to establish microscopic thinking.The sixth is to use the micro representation diagram to help students to understand the transformation and connection of micro model,symbol and macro phenomenon.In order to verify the effectiveness of the proposed teaching strategy,we carried out a research on the cultivation of particle view in acid,alkali and salt teaching.Through the application of teaching strategies and effect analysis,it is found that the academic performance of the experimental class is higher than that of the control class,and there are significant differences between the two classes.This proves that the acid,alkali and salt teaching based on particle view not only helps students understand the essence of acid,alkali and salt knowledge,but also provides a practical basis for junior high school teachers.