一、教学目标1.知识与技能能说出二氧化硅及硅酸的主要性质。知道硅酸钠的重要性质和用途。2.过程与方法(1)自主学习,培养学生自学的能力。(2)通过实验,认识硅胶。(3)引导学生自学,掌握二氧化硅的性质,对硅胶用途的分析,得出相关性质,最后探究在实验室制得硅胶.3.情感、态度与价值观 First, the teaching objectives 1 knowledge and skills can tell the main properties of silica and silicic acid. Know the important properties and uses of sodium silicate. 2. Process and methods (1) self-learning, self-learning ability of students. (2) through experiments, understanding of silica gel. (3) to guide students to learn, master the nature of silica, silica gel analysis of the use, come to the relevant properties, and finally explore the silica gel in the laboratory.3 emotion, attitude and values