在课本的开头,《绪言》一节就有一个家庭小实验:观察蜡烛的颜色、状态、构造以及燃烧的现象。别看小实验内容简单、取材方便、容易操作,却涵盖了整个《绪言》一节的知识要点。蜡烛(物体)是石蜡(物质)组成的,这就是蜡烛的构造。观察并记录蜡烛的颜色和状态,这就是石蜡的物理性质 At the beginning of the textbook, there is a small family experiment in the “Introduction” section: Observe the color, state, structure, and burning of candles. Do not look at the content of the small experiment is simple, easy to draw, easy to operate, but covers the entire knowledge points in the “Introduction” section. The candle (object) is composed of paraffin (material), which is the construction of the candle. Observe and record the color and condition of the candle. This is the physical property of the wax