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Intermolecular forces
chemistry 105
24
Chemistry
Undergraduate 1
06/29/2006

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