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Dipole dipole and LDF are both intermolecular forces. However, dipole dipole only occurs with two polar molecules. LDF is present in practically all molecules. Dipole dipole intermolecular force is also stronger than LDF.
LDF are intermolecular forces that naturally occur between most polar (or induced molecules). They will always be present, however for certain polar molecules, in the moment they interact that moment of interaction is called a dipole dipole moment. Hope this helps!
Dipole-dipole and LDF forces are similar as they occur from the dipoles of molecules. However, dipole-dipole forces occur in polar atoms/molecules while LDF forces occur spontaneously in any atom/molecule as a result of a shift in its electron density.
London Dispersion forces happen between every type of molecule, because it has to do with the very brief polarizability of an electron field. Dipole-dipole forces have to happen between two polar molecules, because the unequal covalent bond makes the opposite ends of each molecule attract, pulling the electron field into its dipole-type shape
LDF happens between nonpolar molecules, and they are extremely weak. Dipole-dipole forces happen between polar molecules, therefore they have a stronger bond, since it has a slight charge that are very similar to ions.
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