Design And Practice Of High School Chemical Layering Experiment Teaching Under The Class-selection System

The General Senior High School Chemistry Curriculum Standards(2017)clearly requires that students have multiple levels of development needs through a tiered,diverse,and optional chemistry program.Carrying out the class-selection system is conducive to achieving this basic concept.The system is based on the principle of teaching students in accordance with their aptitude and the theory of constructivism.The use of the class-selection system can highlight the main position of students and cultivate individualized talents.Chemistry experiment teaching is an important part of chemistry teaching.From the perspective of the combination of chemistry experiment teaching and class-selection,practical research can promote the reform and development of chemistry teaching.This study uses the literature method to draw the feasibility of using the stratified teaching of walking class for chemical experiment teaching.Understand the current situation of chemistry experiment teaching in Tianjin X Middle School,and find that the students' chemistry experiment ability is distributed at different levels;the chemistry experiment teaching form is traditionally single.In response to the above situation,the teaching design and practice of chemical stratification experiments were carried out.In order to facilitate the stratified teaching,based on the principle of teaching students according to their aptitude and the theory of constructivism,the specific development methods of the high school chemistry stratification experiment teaching activities under the class-selection system are proposed.First,based on student differences,a hierarchical experimental teaching.Take the laboratory fixed,the way students flow,and choose the experimental walking system.In the teaching process,the teacher plays the role of leader,helper and facilitator,and implements the responsibility system of the student leader.Finally,the student's classroom harvest is evaluated by designing an experimental activity evaluation form.In the practice of combining the stratified teaching with the chemistry experiment,the new curriculum standards are selected.The students must do the experiment design from the perspectives of stratified design of teaching objectives,hierarchical design of teaching activities,and hierarchical design of teaching evaluation.Through the teaching practice cases of the two experiments of “preparing the concentration of certain substances” and “influencing factors of chemical reaction rate”,the following conclusions are drawn: it is feasible to conduct high school chemical stratification experiment under the shift system.Through the high school chemistry stratification experiment under the shift system,the students' subjectivity and learning enthusiasm have improved.Compared with the traditional teaching mode,the chemical layering experiment teaching under the shifting system improves the problem of insufficient participation of students in the experimental course.The chemistry experiment operation ability of students at all levels has been improved to varying degrees on the basis of the original.The teaching design of chemical stratification experiment based on the class-selection system can reflect the requirements of the new curriculum standards.The status of chemistry experiment teaching has improved.It can be seen that the practice research on the class-selection system after the promulgation of the new curriculum standards has great prospects.Can conduct a combination of practical research on the class-selection system from more angles.You can select more chemistry experiment types from the new curriculum standards for practical research.Combine the Internet and emerging technologies to open a wider variety of experimental types for students to choose.The stratification teaching can also be combined with physical,biological and other subjects,school-based curriculum,activity courses and other activities.In-depth teaching of the grading of the shift system is integrated into the teaching reform,providing practical experience for follow-up research.