Research And Practice On Chemistry Instructional Model In High School Based On The Chemical Core Literacy

In the past 20 years,China's ordinary high school chemistry curriculum reform has been constantly explored and accumulated a lot of valuable experience.Through the practice of chemistry education,it can be able to implement the fundamental task of moral cultivation.In 2015,the Ministry of Education started the ordinary high school curriculum standard revision work.Through constant practice and summary,in January 2018,the "ordinary high school chemistry curriculum standards(2017edition)"(hereinafter referred to as the "new standard")formally promulgated.Based on the characteristics of chemistry subject with chemical refining the essence of chemical subject core accomplishment,curriculum refers to the education of students in the corresponding period in the process of gradually formed needed for future development of key ability,the essential character and values.As one of the basic contents of the core accomplishment of the five major chemistry disciplines,"evidentiary reasoning and model cognition" has become an important way to develop students' scientific thinking and an important guiding ideology to cultivate their ability to solve practical chemistry problems.Among them,the "cognitive" model requires students through the methods of analysis,reasoning,learning the essential characteristics of the research object,composition elements,understanding the relationship between each other,and using the cognitive model,predict the properties of material may be,chemical phenomena,and explain the nature of chemical phenomena and laws.Compared with mathematics and physics,the teaching modebased on model construction has less research and application in chemistry teaching.Based on the core accomplishment of chemistry in senior high school,through the research on the present situation of chemistry modeling teaching in senior high school,we use the strategies of preliminary model,understanding model,application model and perfect model as the main line to carry out modeling teaching design,and carry out teaching practice,evaluation and research.In order to provide materials,the research designed the teaching pre-test and post-teaching test and questionnaire survey.It also provides reference ideas and teaching design for high school chemistry model teaching.The paper is divided into five parts.In the first part,the research status of chemical modeling teaching at home and abroad is discussed through literature research and analysis,and the research ideas and methods are put forward.The second part introduces related concepts and theories.First of all,this paper defines the relevant concepts of chemistry core literacy,chemical model,chemical modeling and chemical modeling teaching;secondly,the main theoretical basis of the study is constructive teaching theory,meaningful learning theory and problem-solving theory.and combined with the research practice;finally,it defines the specific design and practice process of the lesson example "hydrolysis of salt-looking for compound expanding agent".The third part is the analysis and research of the course "Hydrolysis of salts-looking for compound expanding agents".The following contents elaborated in detail: "ion reaction and equilibrium in aqueous solution" curriculum standard analysis,textbook analysis and learning situation analysis,design guiding ideology,teaching objectives,teaching key and difficult points,and model viewpoint.These analysis and research provide guidance for specific teaching design.The fourth part is the implementation of the case of "hydrolysis of salts-looking for compound loosening agents" from the perspective of core literacy.Through the questionnaire survey,the present situation of modeling teaching in chemistry teaching in senior high school is investigated and analyzed,and the research objects are pre-tested to understand the basic situation and analyze the feasibility of modeling teaching.determine the procedure of modeling teaching and the teaching idea of "hydrolysis of salt-looking for compound loosening agent",then carry on the specific teachingdesign,divide the research object into the control class and the experimental class,adopt the way of comparative teaching.After the teaching,the control class and the experimental class carried out the same post-test,and analyzed the practical results of modeling teaching.Through the research,it is found that the teaching effect of chemical modeling teaching in senior high school is better than the traditional teaching model,which is highly operational,efficient and popular with students.The fifth part is the conclusion and reflection of the research results.By analyzing the data of research and investigation,it can be concluded that modeling teaching can enhance students' interest in chemistry learning.Modeling teaching can effectively improve the students' performance in chemistry.Due to the author's lack of knowledge and limited time,there are still some shortcomings in this study.There are many and mature researches on modeling teaching in mathematics and physics.In contrast,the researches on chemistry are lagging behind.It also shows that the research prospect of chemistry construction horizontal teaching is still very broad,which is worthy of in-depth research by researchers.The research results of chemistry teaching based on core literacy construction teaching show that for students,chemical modeling teaching is beneficial to stimulate senior high school students' interest in learning chemistry and improve their chemistry scores effectively;chemical modeling teaching helps students to form a more structured and systematic knowledge network,promote the development of students' thinking and improve their innovative ability.As far as teachers are concerned,modeling teaching will have a profound impact on teachers' teaching concepts,which can help teachers keep pace with the times and accept new teaching ideas.In modeling teaching,we should clarify the specific process of model construction,pay more attention to the development of students' thinking,promote teachers to work hard and develop in the direction of innovation,professionalism and research.Finally,the teachers will be sure to feel the happiness of teaching achievements.The innovation of this study lies in that the content of aqueous solution in the principle of chemical reaction is designed for teaching research and practice,and the new teaching mode of project-based teaching is combined in teaching.What' more,the pre-teachingtest and post-teaching test are also carried out for the lesson.The "hydrolysis of salt" is transformed into "looking for compound loosening agent",and the initiative in the classroom is given to the students,which is completely different from the traditional teaching of salt hydrolysis.This study provides a practical teaching case and reference for high school chemistry teachers to carry out modeling teaching,and has a certain theoretical and practical basis.It is expected that this study can promote other researchers and educational teachers to realize the importance of modeling ideas and modeling teaching,so as to carry out more in-depth and valuable research.