Analysis Of Difficulties In Learning Chemical Keys And Research On Teaching Strategies

"Chemical Bond" is the content of the second chapter of the required Senior Middle School Chemistry course.It mainly studies the relationship between the change of matter,the change of energy and the chemical bond.The chemical bond is the understanding of the structure of matter based on the atomic structure and the periodic law of elements.And the material structure is an important main line of the whole senior high school basic chemistry.Learning the chemical key is not only conducive to the development of students' view of particle and change,but also promotes the formation of scientific literacy of concept construction.Moreover,it can make students get the unique triple representation of chemistry.But the knowledge of chemical bond is complex and abstract,and the students' abstract thinking ability is very high.Besides,students are easy to form different ideas,which makes it very difficult Many students find it difficult to learn and attack their self-confidence in learning chemistry.Therefore,it is necessary to obtain different ideas from the perspective of students,through questionnaires,interviews and other research methods,to find out the learning difficulties of chemical keys.Only by analyzing the reasons why students find it difficult and finding out the corresponding solving strategies can we help students better understand and establish correct concepts and provide valuable resources for teachers in teaching practice.On the basis of reading the literature,mainly from the causes of learning difficulties,the solution of learning difficulties,the transformation of learning difficulties,the subject knowledge points plus the specific study of learning difficulties,chemical key Based on the review of the five parts of the relevant research,the purpose and task of this study are determined in order to understand the existing research work and the existing problems.On the basis of studying the chemistry curriculum standard and analyzing the three editions of Luke edition,human education edition and Su education edition,the paper draws out the concept map of chemical key,determines the knowledge points of the survey,compiles the questionnaire of chemical key knowledge,and modifies and perfects the questionnaire.Through the analysis of the results of the first questionnaire and the interview of some representative students,a two-stage questionnaire was compiled toanalyze the factors of the learning difficulties of chemical keys.Combining the results of questionnaires 1 and 2,the As well as oral report and case study,the main difficulties of students are obtained,including the nature of chemical bond,the judgment of ionic bond and covalent bond,the relationship between material change and chemical bond,and the calculation of chemical reaction energy by using bond energy.The application of chemical bond and other five parts,and find out the different ideas that students may have in learning chemical bond,the main reasons for students' learning difficulty are the complexity of chemical bond knowledge,the discontinuity of the former knowledge.Based on the students' triple representation difficulties and different ideas,this paper puts forward four teaching strategies for learning chemical keys: paying attention to concept teaching,dynamically generating knowledge,and fully understanding learning.Feelings;attach importance to cohesive teaching;pay attention to triple representation of the combination of teaching methods.