Similar composition and structure of the material, the greater the molecular weight, the greater the van der Waals force, to overcome the intermolecular attraction to material melting and vaporization requires more energy, melting, boiling point higher, but there are hydrogen bond molecular crystals

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The composition and the structure similar material, the relative molecular mass is bigger, the van der Waals force is bigger, overcomes the intermolecular attraction to cause the material melting and the vaporization on need more energies, the melt, the boiling point is higher. When has the hydrogen

Composition and structure of similar substances, relative molecular mass larger the greater van der Waals force to overcome the Intermolecular attraction that need more material melting and vaporization energy, melting, boiling point is higher. melting boiling point when there are hydrogen-bonded Mo

Make up the material similar to structure, relatively the greater the molecule quality is, the greater Van der Walls force is, overcome among the molecules the gravitation makes the material melt and vaporize and need more energy, melt, the boiling point is the higher. But exist hydrogen key time su