(electrostatic force: it is the attraction between polar molecules. Inductive force: it is the interaction between the permanent dipole of a polar molecule and the induced dipole it causes on other molecules. Dispersion force: it is the interaction between molecular instantaneous dipoles. )
Van der Waals force has no saturation and directionality, and exists permanently between all molecules. Van der Waals force is also called intermolecular force. Molecular substances can change from gas to liquid and from liquid to solid, indicating that there is interaction between molecules, which is called intermolecular force or van der Waals force. There are three sources of intermolecular forces, namely, dispersion force, induced force and directional force. Dispersion force is the force between molecular instantaneous dipoles, and its magnitude is related to factors such as molecular deformation ability. Generally, the larger the molecular weight, the more electrons contained in the molecule, the greater the deformation ability of the molecule and the greater the dispersion force. The induced force is the force between the intrinsic dipole and the induced dipole of the molecule, and its magnitude is related to the polarity and deformation ability of the molecule. Orientation force is the force between the inherent dipoles of molecules, and its magnitude is related to the polarity and temperature of molecules. The greater the dipole moment of polar molecules, the greater the orientation force; The higher the temperature, the smaller the orientation force.
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