Abstract Based on the investigation and analysis of the students’ existing electrolytic cognitive model, and taking the electrolytic saturated salt water as the research background, this paper inquires into why saturated salt water is used and why iron nails are used in the cathode, in order to break down the students’ misconceptions about the absoluteness and uniqueness of discharge sequence, and realizes that the discharge sequence of ions is affected by concentration, electrode material and electricity. Pressure and other factors have common influence. Questioning the scientificity of the cognitive model of ion migration discharge electrolysis, the students design experiments to analyze the experimental phenomena, and self-modify and optimize the redox discharge model to analyze the electrolysis problem, so as to realize the revision and reconstruction of the existing cognitive model of electrolysis.
LI Xiao-Ming. Modification and Reconstruction of Cognitive Model: Teaching of “Re-exploration of Electrolytic Salt Water”[J]. Chinese Journal of Chemical Education, 2020, 41(11): 23-29.
