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一、辨水识水——初识水的性质师:每个小组桌上有四杯不一样的物质,分别标明了1、2、3、4号,其中只有一个杯中装的是我们平时在教室里喝的那种纯净水。小组内先找一找,看能不能找到那一杯纯净水。(学生用自己的方法寻找,或看、或闻、或摸)师:找到了吗?生:找到了!找到了!(兴奋)师:先听听同学们的意见,你是怎么找到的。生:我知道哪一杯是我们平常喝的水了,是3号杯中的水。师:为什么呢?
First, the water to identify the water - the nature of water to understand the initial division: Each group has four different cups of material on the table, respectively, marked 1,2,3,4, of which only one cup loaded is our usual The kind of pure water you drink in the classroom. Look inside the group to see if you can find the glass of pure water. (Students find, look, smell, or touch in their own way) Teacher: Did you find it? Student: Found! Found! (Excited) Teacher: Listen to the opinions of your classmates and how did you find them. Health: I know which cup is the water we usually drink, is the water in the No.3 cup. Teacher: Why?