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教学目标 :1.通过复习溶液、浊液的有关知识引出分散系的概念。2 .通过实验 ,培养学生观察、分析问题的能力 ,以形成胶体的概念 ,并正确的认识胶体的本质特征。3.通过实验掌握胶体的制取。教学重点、难点 :胶体的概念。教学方法 :引导探究法。教学过程 :[复习提问 ]初中时我们
Teaching objectives: 1. To introduce the concept of dispersion by reviewing the knowledge of solutions and turbid fluids. 2. Through experiments, develop students’ ability to observe and analyze problems to form the concept of colloids, and correctly understand the essential characteristics of colloids. 3. Grasp the preparation of colloids through experiments. Focus and Difficulties in Teaching: The concept of colloids. Teaching method: Guided inquiry method. Teaching process: [review questions] in junior high school