Research On Strategy Of Chemistry Experiment Teaching In Senior High School Based On Preconcept

The core concept of the new curriculum requires that teaching should realize "focus on subject" to "focus on students",teachers should become the leader of students,and teaching should give full play to the students'main position.Chemical experiment is an important way for students to learn chemistry knowledge from microcosmic angle,cultivate students'comprehensive ability,and promote students to set up rigorous scientific thinking.However,due to the limited teaching resources and the long term impact of "exam oriented education",the function of experimental teaching can not play its due role.In the current chemistry experiment class,most chemistry experiments are mainly based on teacher demonstration or multimedia presentation.Some teachers ignore the students' pre-concept and actual level,and blindly lead students into the inquiry experiment in order to complete the teaching content.The whole class,the students know it but do not knowing why it is.This not only causes students to learn chemical experiments mechanically,but also loses interest in chemistry learning,and ignores the unique functions of experimental teaching.With the integration of pedagogy and psychology,more and more scholars have realized that students do not know nothing about new knowledge before entering the classroom.They have a certain understanding of new knowledge through their daily life and the previous stage of learning.Some pre-concepts are consistent with scientific knowledge,and students will build meaningful knowledge on this basis.There are some deviations between some pre-concepts and scientific knowledge,which will prevent students from learning new knowledge.Therefore,teachers should not only pay attention to the content of teaching,but also fully understand the students' pre-concept.The teacher reasonably designs the teaching content,exposing the students'pre concept in teaching.When students realize the similarities and differences between the pre-concept and the scientific concept,they arouse the desire of students to explore.In the process of teaching,we should promote the supplement,perfection and transformation of students'pre-concept,and improve the teaching effect of chemical experiment teaching.This topic focuses on the students' pre-concept and high school chemistry experiment teaching.Through literature research,questionnaire,and classroom observation,firstly this paper explored the influencing factors of the pre concept of a key high school student in YanBian.Secondly,through the pre-homework to know students' pre-concept about the content of chemical experiment teaching.Finally,putting forward the teaching strategy of chemistry experiment with the pre-concept.The research results of this subject are summarized as follows:1.Before class,teachers understand and analyze students'pre-concept through pre-homework.The teacher reasonably designs the teaching content,exposing the students' pre concept in teaching.When students realize the similarities and differences between the pre-concept and the scientific concept,they arouse the desire of students to explore.In the process of teaching,we should promote the supplement,perfection and transformation of students' pre-concept.In preparing lessons,we must truly prepare the basic requirements of "preparing students" and further improve the teaching effect of chemical experiment classroom.2.The teaching strategy of optimizing experimental teaching is put forward based on the concept of students:(1)Using task-driven-teaching method to create situations and stimulate interest in learning.Example of the working principle of the original battery;(2)Designing experimental teaching contents reasonably,and promoting the supplement,perfection and transformation of the pre-concepts.Example of the nature of sodium metal and explore the reaction between iron and water vapor;(3)Combining information technology with experiment to deepen the understanding of experimental content.Example of the determination of the neutralization titration curve.The teaching strategy proposed in this study can realize the supplement,perfection and transformation of students' pre-concept.We hope that this study will provide reference for front-line teachers and other scholars.