The Investigation On "Chemical Equilibrium"conception Alternative Frameworks Of High School Students

Students’ scientific concepts learning and deep understanding is the basics for cultivating the ability of thinking,also is the vital aspect of developing scientific literacy.However,majority of studies found that students will inevitably form some special ideas in mind that is inconsistent of scientific concepts in the course of studying scientific concept,called “alternative frameworks”.It always hinders students’ deep understanding and the abilities of solving the problems.Should teachers know students’ alternative framework and adopt appropriate teaching strategies,can they promote students learning knowledge of system.Based on the review of the results at home and abroad,this study analyzes its teaching values and comb the three versions of the textbooks about arrangement order of the chemical equilibrium knowledge.Then compiles diagnostic tool about “chemical equilibrium”knowledge which is administered to juniors in three high schools.The data are analyzed and handled,show students have following alternative frameworks: the establishment of the chemical equilibrium,chemical equilibrium constant,the influence of external factors on the chemical equilibrium and the interpretation of the relevant principles.In practice found that students had various alternative frameworks about“chemical equilibrium”concepts,which has the profound influence for students to learn knowledge about ionization balance,hydrolysis of salts equilibrium, as so as precipitation dissolving balance.Learning of students’ thinking model though analyzing the types and causes of alternative frameworks.Last put forward “chemical equilibrium” knowledge teaching suggestions.(1)For the process to establish the chemical equilibrium in teaching should establish the macro- microscopic- triple characterization symbols;(2)The use of inquiry method to guide students to derive the chemical equilibrium constant expressions;(3)By comparing chemical equilibrium constant and concentration of providers explain chemical equilibrium problems.