| Looking at the history of chemical development at home and abroad as well as the application mode and state of chemistry in the current society,the influence of chemical experiments on the development of chemistry is irreplaceable.The new curriculum standard also requires that "starting from students' existing life experience,let them feel the importance of chemistry in familiar life situation and social practice,and understand the relationship between chemistry and daily life".Therefore,based on the teaching theory of "education is life" and "5E",this study analyzed and summarized the curriculum standards,syllabus,textbooks and the current situation at home and abroad of junior high school chemistry,and investigated the current situation of the students in junior high school H.Combining with the current situation analysis,the theoretical framework of chemical experiment development was put forward.According to the theoretical framework,six chemical experiment cases were designed and classes were conducted.Implement it in classroom teaching.It provides a feasible scheme for solving the problems of safety,interestingness,fostering students' interest in learning chemistry,and closing the relationship between chemistry and life.Based on this,the present situation of combining chemical experiments with life at home and abroad was analyzed.Through collecting and summarizing the related literatures of "chemical experiment type","chemical experiment technology research","chemical experiment teaching research","chemical experiment life research" in KNOWN,we can find that in terms of the number of papers searched,our country has not paid enough attention to the life of chemical experiment in junior middle school,and the author basically takes junior middle school chemistry teachers and master's degree research as examples.Graduate students are the main ones.Many experimental life-based research is only studied as chemical life-based teaching,for specific,experimental case design is few and far between.The analysis shows that the problems in junior middle school chemistry experiment mainly focus on the following aspects:(1)Traditional chemistry experiment teachers pay too much attention to the mastery of knowledge in textbooks,ignoring the role of the experimental process.(2)The resources of chemical experiment teaching are insufficient and the utilization rate of laboratory is not high.(3)It is difficult to guarantee the safety of the experiment.To solve these problems,first of all,this study investigated and analyzed the current situation of chemical experiments in H Middle School.Based on the theory of "education is life" and the analysis of the above situation,the principles of scientificity,life,safety,interest,cooperation and comprehensiveness are developed,and the object,content,background,goal,principle,method,material of the experiment are analyzed,selected and designed.Five experiments related to chemical experiments in daily life were designed.The author explored and improved the experiments in the laboratory to determine the final experimental scheme.The above five experiments are implemented in the classroom teaching of junior middle school by using the "5E" teaching mode.Two of the four classes were used as the experimental group and the other two as the control group.The results showed that the students' satisfaction with the experiment was very high.The students' ability of safety,liferelated ability,problem-solving ability and teamwork ability were significantly improved,but there were obvious deficiencies in the mastery of chemical knowledge.This study also used the junior middle school chemistry experiment classroom teaching evaluation observation scale,after-class teacher interviews to evaluate the classroom teaching effect.The evaluation found that the overall model of chemical experiment was well accepted by chemistry teachers,but the classroom arrangement and time control need to be improved. |
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