一、知识结构二、基础知识要点（一）熔解和凝固1．定义熔解物质从固态变液态。（吸热过程）凝固物质认液态变固态。（放热过程）熔点晶体溶解时的温度。晶体不同，熔点不同。凝固点液体凝固成晶作时的温度。同一晶体熔点和凝固点相同。2．特点晶体熔解（凝固）时，吸收（或放? First, the knowledge structure Second, basic knowledge points (a) melting and solidification 1. Define the molten material to change from solid to liquid. (Endothermic process) Solidification Substances Recognize that liquids change to solid state. (Exothermic process) The temperature at which melting point crystals dissolve. Different crystals have different melting points. The temperature at which the freezing point liquid solidifies into crystals. The same crystal has the same melting point and freezing point. 2. Features Absorption (or release) when crystal melting (solidification)