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Anonymous users2024-02-07**Sina Q&A] Death Diary Vice 2018-06-06 05:02:22The melting point of matter is related to the magnitude of the intermolecular force (that is, the van der Waals force), because it is from an orderly solid state to a liquid state with a more chaotic order, only looking at the gravitational force between molecules and molecules, there is no change for a single molecule.
Generally speaking, the greater the van der Waals force of a substance, the higher its melting and boiling points. There are generally three factors that affect van der Waals forces: dispersion force, induction force and orientation force, but the main force is the dispersion force, and the rest can be ignored, while the dispersion force refers to the instantaneous deformation of the electron cloud of the molecule, resulting in a dipole, and the resulting force is related to the deformability of the molecule.
You haven't learned any of these things, so it can be simply understood that the greater the relative molecular mass, the greater the polarizability, the greater the dispersion force, so the intermolecular force is large, and the melting point is high. However, note that for molecules such as H2O and NH3, intermolecular hydrogen bonds can be formed, and this force (relative to the intermolecular force) is very large, so it is discussed in particular. So, the order you give should be h2o h2se h2s and for the same main group hydrides should have a melting point that rises from top to bottom (not counting hydrogen bonding substances) some of the above are incorrect, I give the data:
Melting Point: H2O: 0
h2se：h2s：
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Anonymous users2024-02-06Your valence.
And the molecular formula is not back?
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Anonymous users2024-02-05Name the forces that exist between the following groups of substances (orientation forces, induction forces, dispersion forces, hydrogen bonds) (1) HBR and HCl
2) Benzene and CCL4
3) H2O and I2
4) CO2 gas.
5) H2O and NH3
1) Orientation force, induction force, dispersion force.
2) Dispersion force.
3) Induction force and dispersion force.
4) Dispersion force.
5) Orientation force, induction force, dispersion force, hydrogen bonding.
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Anonymous users2024-02-04Name the forces that exist between the following groups of substances (orientation forces, induction forces, dispersion forces, hydrogen bonds) (1) HBR and HCl
2) Benzene and CCL4
3) H2O and I2
4) CO2 gas.
5) H2O and NH3
1) Orientation force, induction force, dispersion force.
2) Dispersion force.
3) Induction force and dispersion force.
4) Dispersion force.
5) Orientation force, induction force, dispersion force, hydrogen bonding.
The aqueous solution of H2SE is more acidic than H2S.
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