物质熔、沸点高低是由构成物质质点间作用力的大小决定的。物质质点间作用力包括分子间作用力(范德华力)、氢键和化学键。化学键又包括离子键、共价键和金属键。因此,判断物质熔、沸点高低主要依靠比较质点间作用力的大小。一、物质熔、沸点高低判断的一般规律1.状态法判断物质 The melting of materials and the boiling point are determined by the magnitude of the forces acting between the material particles. The interparticle forces include intermolecular forces (van der Waals forces), hydrogen bonds, and chemical bonds. Chemical bonds include ionic, covalent, and metallic bonds. Therefore, judging whether the material melts or the boiling point depends on the magnitude of the force between the particles. First, the general law of material melting, boiling point judgment 1. State method to determine the material