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初三学生在掌握“物质”,“分子、原子”,“元素”,“单质”,“溶解度”,“干馏”,“酸”……等概念时,是比较困难的。表现在学生不能用简单明确的语言来表达这些概念。即使能熟背化学概念的含意、律文,也没有能力把概念加以概括和灵活应用。要是问学生“元素和单质有何区別?燃烧与自燃有何不同?”就很难得到满意的回答。一般学生,常有下列的错误:“某物质在100克溶液里所能溶解的最多克数叫溶解度。”“电流通过
Students in grade three are more difficult to grasp the concepts of “material”, “molecule and atom,” “element,” “simple substance,” “solubility,” “dry distillation,” and “acid. This is reflected in the fact that students can not express these concepts in plain language. Even if we can understand the meaning of the chemical concept, we can not sum up the concept and apply it flexibly. If you ask students ”What is the difference between elements and elements? What is the difference between burning and spontaneous combustion?“ Difficult to get a satisfactory answer. The average student often has the following error: ”The maximum amount of gram that a substance can dissolve in 100 grams of solution is called solubility.“ ”The current passes