内容正文:
课题2
学习化学的途径——实验
实验探究
做出结论
科学分析
观察现象
记录现象
结果数据
观察化学实验的一般方法(或步骤)
实验前:观察蜡烛的物理性质
颜色、状态、形状、气味、硬度、密度、溶解性等等
实验过程中:观察蜡烛燃烧时的现象
是否有发光、放热、变色、气体、沉淀、声音等现象
实验后:分析现象的原因,得出结论
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