Intermolecular forces

the electronegativity
the ability of an atom to attract electrons in a covalent bond
the pauling scale (values)
0.7 to 4.0
the higher the number on the pauling scale
the stronger the pull on electrons of the bond
what element has the weakest pull and what is that number
cesium 0.7
what element has the strongest pull and what is its number?
flourine 4.0
what is the periodic trend of electronegativity on the periodic table?
more electronegative as you move up and to the right
what is the electronegativity difference between ions?
greater that 1.9
what is the difference in elctronegativity between sodium and chloride?
2.1
what would be the electronegativity difference in a convalent bond?
less than 0.5
CH4 is what kind of bond
covalent
what is the type of bond when the diffrence in electronegativity is between 0.5 and 1.9?
polar covalent
what kind of bond is water?
polar covalent (1.4)
intermolecular forces are not applicable to
gases (see definition of ideal gas)
Intermolecular
between different molecules
intermolecular forces can relate to
boiling point, melting point, solubility, vapor pressure
dipoles occir when
there is a difference in charges due to differences of electronegativity between two bonded atoms
the category of intermolecular force is related to
the magnitude of the dipoles involved
where do you usually see dipole-dipole bonds?
polar covalent molecules
hydrogen bond is a special type of
dipole-dipole
For a bond to be considered a hydrogen bond, the hydrogen must be bonded to
oxygen, flourine or nitrogen (fon)
london dispersion forces are due to
temporary induced dipoles
london dispersion forces are usually found in what type of molecules
non-polar
what type of bond is the weakest
london dispersion
what kind of bond is the strongest
hydrogen
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