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创设情境:用幻灯片展示山水风光,溶洞奇观的图片.导入:酸,碱,盐是我们最常见的物质,他们在水中都能电离出离子,那么,不同的物质电离程度有什么不同呢?我们这节课就研究关于弱电解质的电离问题.板书:一、强弱电解质实验1实验步骤:等体积、等浓度的盐酸和醋酸与等量镁条的反应,并测这两种酸的pH.学生发现:(1)盐酸、醋酸都是电解质,在水溶液中都能发生电离,并产生氢离子;(2)镁与盐酸反应较快,表明同体积,同浓度的两溶液,盐酸比醋酸的氢离子浓度大,这就说明盐酸易电离,而醋酸难电离.(3)通过测溶液的pH,能够
Creating Scenario: Use slideshows to show pictures of landscapes and wonders of caves. Introduction: Acids, alkalis and salts are our most common substances, and they ionize ions in water. So, what is the difference in the degree of ionization of different substances? We class this session to study the issue of ionization of weak electrolytes. Plank: First, the strong and weak electrolyte experiments 1 Experimental steps: equal volume, the concentration of hydrochloric acid and acetic acid with the same amount of magnesium reaction, and measure the pH of these two acids Students found: (1) Hydrochloric acid and acetic acid are all electrolytes, which can ionize in aqueous solution and generate hydrogen ions; (2) Magnesium and hydrochloric acid react faster, indicating that the same volume, the same concentration of two solutions, hydrochloric acid than acetic acid Of the hydrogen ion concentration, which shows that hydrochloric acid is easy to ionize, but difficult to ionize acetic acid. (3) By measuring the solution pH, can