一、实验预习1．物质从___的过程叫熔解；从___的过程叫凝固。2．物体分晶体和非晶体，晶体在熔解过程中要___热量，但温度___，晶体溶解时的温度叫做___。3．素是热的___，且容易挥发成气体，因此，不能把萘粉放火烧坏中直接加热。必须把禁粉装入试管里，再把试管放入___，用? First, the experiment preview 1. The process of material from ___ is called melting; the process from ___ is called solidification. 2. The object is divided into crystals and non-crystals, the crystal must be ___ in the melting process, but the temperature ___, the temperature when the crystal is dissolved is called ___. 3. Is a hot ___, and easily volatile into gas, therefore, can not be directly heated in the naphthalene powder burn. Must be placed in a test tube powder, and then put the test tube into ___, use?