Properties favor melting and also boiling points room a measure of how strong the attractive forces are in between individual atoms or molecules. (We call these intermolecular pressures – forces between molecules, together opposed come intramolecular pressures – pressures within a molecule. )

It all flows from this general principle: together bonds become more polarized, the fees on the atoms come to be greater, which leader to higher intermolecular attractions, which leader to higher boiling points.

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There space four significant classes that interactions in between molecules and also they are all various manifestations of “opposite fees attract”.

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The four crucial intermolecular pressures are together follows:

Ionic bonds > Hydrogen bonding > Van der Waals dipole-dipole interactions > Van der Waals dispersion forces.

Let’s look at them individually, from the strongest to weakest.

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Table of Contents

1. Ionic forces

Ionic room interactions between charged atom or molecules (“ions”). Positively charged ions, such as Na(+) , Li(+), and also Ca(2+), space termed cations. Negatively fee ions, such together Cl(–), Br(–), HO(–) are called anions (I constantly got this straight through remembering that the “N” in “Anion” stood because that “Negative”) The attractive forces between oppositely charged ion is defined by Coulomb’s Law, in i m sorry the force increases with charge and also decreases as the distance between these ions is increased. The extremely polarized (charged) nature that ionic molecule is reflect in your high melting points (NaCl has a melting suggest of 801 °C) and also in your high water solubility (for the alkali metal salts, anyway; steels that form multiple charges prefer to leave residues on her bathtub)

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5. Bottom Line

Boiling points room a measure up of intermolecular forces.The intermolecular pressures increase with boosting polarization of bonds.The stamin of intermolecular pressures (and therefore affect on cook points) is ionic > hydrogen bonding > dipole dipole > dispersionBoiling suggest increases through molecular weight, and with surface area.

For one more discussion that these ethics see Chemguide

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