Intermolecular forces (nonbonding forces) exist between molecules and influence the physical properties of the substance. The 5 most common intermolecular forces are:
1) Ion-Dipole is the intermolecular force that exists between an ion and a polar compound. (Strongest)
Ex: NaCl dissolved in H2O
2) Hydrogen Bonding is the intermolecular force that exists when hydrogen is directly connected F, O, N. (2nd Strongest)
Ex: NH3 H2O HF
3) Dipole-Dipole is the intermolecular force that exists with polar covalent compounds. (3rd Strongest)
Ex: CHCl3 HCl HBr HI
4) Dipole/Induced-Dipole is the intermolecular force that exists when a nonpolar covalent compound interacts with a polar covalent compound. (4th Strongest)
Ex: S8 (nonpolar solute) in H2O (polar solvent)
5) London Dispersion or Van der Waals Forces is the intermolecular force that exists with nonpolar covalent compounds. (Weakest)
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