Research On Chemistry Unit Teaching In Senior Middle School Based On Project-based Learning

The “chemistry curriculum standard of senior high school(2017Edition)” proposes to strengthen the cultivation of students' core quality of chemistry,set up diversified courses to cultivate students' high-level thinking?innovative spirit and inquiry ability,to meet the needs of future social development.In traditional teaching,teachers pay attention to the teaching of knowledge and ignore the subjectivity of students,it is difficult to improve students' interest in learning.Project-based learning takes students as the center,takes real problems as the guide,takes projects as clues,runs through the whole teaching process,collects data,analyzes and solves problems in the way of group cooperation,and finally tests the learning results through the presentation of works.Based on the curriculum standards,unit teaching reorganizes the teaching contents,breaks the original knowledge system,realizes the integration of knowledge,and allows students to learn through communication and cooperation,which is conducive to the consolidation of students' knowledge.The implementation of project-based learning usually takes some time.If combined with unit teaching,it can give better play to their advantages,break the traditional teaching method based on class hours,make the knowledge mastered by students more systematic,improve learning efficiency and cultivate students' comprehensive ability and core literacy.This study is mainly guided by the theories of constructivism,humanism and pragmatism,using the methods of literature research,questionnaire survey and practical research,on the basis of defining the concepts of project-based learning and unit teaching,this paper designs and practices the unit teaching case of project-based learning,take "sulfur and its compounds" unit as an example,this paper expounds the strategies and methods of integrating project-based learning into unit teaching design,in order to provide reference for front-line teaching.First of all,a questionnaire survey and interviews were conducted with senior high school students and teachers.It was found that senior high school students have some problems,such as low interest in chemistry learning,fragmented knowledge points,poor practical operation ability and so on;Teachers recognize that project unit teaching helps to cultivate students' core literacy and comprehensive ability,but due to the pressure of entering a higher school,it provides less opportunities for students to explore,and teachers themselves lack the theoretical and practical experience of project unit teaching.Based on the above survey results,taking the current hot topics "carbon peak","carbon neutralization" and "three major environmental problems in the world" as the background,taking "curriculum standards as the basis,student-centered and knowledge reconstruction" as the teaching design principle,and referring to the six-dimensional design of project-based learning,the project-based learning teaching design of "acid rain" for "sulfur and its compounds" unit is carried out.Taking "what do we know about acid rain" as the general driving problem,we set up three sub projects of "formation of acid rain","harm of acid rain" and "prevention and control of acid rain",and equipped the three sub projects with corresponding driving problems.At the same time,reconstruct the sulfur related knowledge distributed in the teaching materials,embed it into the teaching cases,solve the project problems based on the real situation,take the big concept as the core,explore the properties of sulfur dioxide and sulfuric acid,construct the cognitive model of mutual transformation between different valence sulfur compounds,design the desulfurization scheme for acid rain prevention,improve the ability of information understanding and comprehensive application,and improve the model cognition and problem-solving ability.Develop students' subject core literacy,so as to implement the requirements of the integration of teaching,learning and evaluation.Through the presentation of students' works and unit test to test the achievement of students' knowledge ability and literacy level,explore whether this model can improve students' academic performance,and finally reflect and prospect.It is found in the teaching research that the unit teaching based on project-based learning can not only improve students' learning interest and academic performance,but also cultivate students' group cooperation and practical exploration ability in the process of participating in the project,which fully reflects the students' dominant position and makes the knowledge mastered by students more systematic,so as to realize in-depth learning and promote the formation of core literacy.The research shows that project-based learning provides practical ideas and methods for cultivating students' subject literacy,and provides a carrier and entry point for the implementation of core literacy training requirements.