Practice of Microfocus and Delayed Photography Technology in Middle School Chemistry Teaching:Saturated Solution
ZHU Cheng-Dong1**, WU Xue-Liang2, LI Yang3,4, XU Hong5
1. Anhui Institute of Educational Sciences, Hefei 230061, China; 2. Haydn School of Hefei, Hefei 230051, China; 3. College of Education, Central China Normal University, Wuhan 430079, China; 4. Hefei 46th Middle School, Hefei 230091, China; 5. Teaching and Research Department of Xuancheng Education and Sports Bureau, Xuancheng 242000, China
Abstract By using the principle of lever balance, the process of solid dissolution and crystallization is cleverly characterized as the tilt of the lever, and the amount of dissolution is characterized as the degree of tilt. The delay photography technology is used to condense several hours of experiments into tens of seconds, improving classroom teaching efficiency. At the same time, micro focus photography is used to capture the shape changes of sucrose crystals during dissolution and crystallization, providing multiple convincing evidence for “no longer dissolving”, greatly enriching students’ visual perception. Based on the experimental phenomena in the experimental video, students use scientific methods such as comparative analysis and reasoning to independently construct the concepts of saturated and unsaturated solutions, and construct a model for the mutual transformation between saturated and unsaturated solutions from three dimensions: solute mass, solvent mass, and solution temperature. Under the guidance of the teacher, students use the idea of controlling variables to construct the concept of solubility.
ZHU Cheng-Dong, WU Xue-Liang, LI Yang, XU Hong. Practice of Microfocus and Delayed Photography Technology in Middle School Chemistry Teaching:Saturated Solution[J]. Chinese Journal of Chemical Education, 2024, 45(13): 46-51.
