Practical Research On The Online And Offline Blended Teaching Mode Of High School Chemistry

The "High School Chemistry Curriculum Standard 2017 Edition" proposes to pay attention to the teaching reform in the information environment and promote the transformation of the talent training model.Ionic reaction is an important transition for students from macro to micro.In order to comply with the needs of students to construct ion view,it promotes the combination of information technology and knowledge learning.So research the blended teaching mode about ion reaction.Blended teaching is not only a supplement to classroom teaching,but also the integration and influence of online learning and classroom teaching.Based on the survey of the current situation of blended teaching in high school chemistry,this article uses the DingTalk to publish a problem situation.Focusing on the problem,it carries out a mixture of three teaching organizations:self-preparation before class,in-depth exploration during class,and expanded knowledge after class.Use teaching resources such as textbooks,Microsoft Office PowerPoint,video and animations.Blending teaching strategies such as situational teaching,autonomous learning,inquiry teaching,and enlightening teaching.Use various teaching methods such as lecture method,demonstration method,discussion method and experimental method.Carry out blended teaching practice of ion reaction.The purpose of the research is to allow students to form good learning thinking,improve the Core literacy of chemistry,and provide ideas and suggestions for teachers to implement blended teaching.This paper is mainly divided into five chapters:The first chapter explains the research background by reading the literature,and analyzes the research trends of blended teaching at home and abroad.Clarify the purpose and significance of the research,and determine the content,methods and ideas of the research.The second chapter gives an overview of blended teaching.Including the introduction of related theoretical foundations,the definition of the concepts of online+offline blended teaching and core chemistry literacy.Explains the mode,principles and strategies of blended teaching.Blended teaching focuses on self-study before class,in-depth exploration during class,and expanded knowledge after class,mixing a variety of teaching resources,teaching strategies and teaching methods.The third chapter survey questionnaire designed four dimensions of students’ learning interest,method,demand and current situation.Investigate the use of information-based teaching media and the status quo of blended learning.Analyzed the feasibility of blended teaching implementation.The fourth chapter selects the content of high school chemistry "ion reaction",analyzes the teaching background,and designs the specific teaching process.Before class,we will publish learning topics and resources through online DingTalk,and guide students to search knowledge preview online.In view of the students’ preview situation,in the classroom,the students are guided to conduct experimental investigations through the way of asking questions.Students understand the essence of ion reaction through virtual experiment of measuring conductivity.Learn to understand ion reactions in depth from qualitative to quantitative,and leam to write ion equations.Deepen and expand students’ knowledge coverage after class,such as expanding the conditions under which ion reactions occur.Consolidate the important and difficult points,attach importance to interactive answering with students,and let students form the concept of threefold representation of macro→ micro→ symbols.Through the comparison between the front and the back,the performance of the blended teaching class has been significantly improved,which shows that the mixed teaching has advantages in improving the quality of teaching.The fifth chapter summarizes the results of the research,draws feasibility recommendations that can be applied to chemistry classrooms,points out the existing shortcomings and looks forward to itThis research provides effective support for achieving literacy-based teaching in the context of the Internet.Strengthen the practical research on blended teaching,and provide feasible suggestions for the online and offline blended teaching mode of high school.