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现代化学教学观认为,化学教学应注重对学生进行探索化学知识的过程和学习方法的训练,以此激发学生发现、分析和解决问题的兴趣,形成求学所必需的质疑态度和批判精神,从而培养学生多维思考、分析推理、归纳总结的能力。在电解规律的教学过程中,我们尝试采用递进式探究模式,取得了明显的实效。电解过程中,电解质电离出的阴、阳离子和水电离出的 H~+、OH~-均可能在阴、阳两极放电。由于电解质种类不同,电极材料不同,因而电极产物不同,同时电解质溶液在电解过程中 pH 变化也不同。
The modern teaching view of chemistry holds that chemistry teaching should focus on the process of exploring students’ knowledge of chemistry and the training of learning methods, in order to stimulate students’ interest in discovering, analyzing, and solving problems, and form the questioning attitude and critical spirit necessary for schooling, so as to cultivate The students’ multidimensional thinking, analytical reasoning, ability to summarize. In the teaching of the law of electrolysis, we tried to adopt a progressive exploration model and achieved significant results. In the electrolysis process, the negative ions and positive ions ionized by the electrolyte and the H+ and OH~ ions ionized by the water may be discharged at both the negative and positive electrodes. Due to the different types of electrolytes, the electrode materials are different, and thus the electrode products are different. At the same time, the pH of the electrolyte solution varies during the electrolysis process.