论文部分内容阅读
一、教材说明本课主要有三个活动内容:“食盐在水里溶解了”、“面粉在水里溶解了吗”、“观察高锰酸钾和砂糖的溶解”。“食盐在水里溶解了”第一个实验是将食盐和沙分别放进水中经搅拌以后观察比较,初步得出溶解的描述性概念。
First, the textbook Description This lesson has three main activities: “salt dissolved in water,” “dissolved in the water, the flour you”, “observed potassium permanganate and sugar dissolved.” “Salt dissolves in the water.” The first experiment was to compare the salt and sand into water after mixing. Preliminary descriptive concepts of dissolution were obtained.