Dipole-Dipole Forces (Leaving Cert Chemistry): Flashcards
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Dipole-dipole forces definition
Dipole-dipole forces definition
Intermolecular forces of attraction between polar molecules
Type of molecules with dipole-dipole forces
Type of molecules with dipole-dipole forces
Polar molecules
Nature of dipole-dipole forces
Nature of dipole-dipole forces
Permanent
Dipole-dipole: inter- or intramolecular?
Dipole-dipole: inter- or intramolecular?
Intermolecular (between molecules)
Dipole-dipole strength vs London forces
Dipole-dipole strength vs London forces
Stronger than London forces
Example molecule with dipole-dipole forces
Example molecule with dipole-dipole forces
or propanone (acetone)
Hydrogen bonding definition
Hydrogen bonding definition
Strong dipole-dipole with H bonded to N, O, or F
Elements for hydrogen bonding (NOF rule)
Elements for hydrogen bonding (NOF rule)
Nitrogen (N), Oxygen (O), Fluorine (F)
H-bond strength (% of covalent bond)
H-bond strength (% of covalent bond)
~10% of covalent bond
Why H-bonding is strong
Why H-bonding is strong
Small H atom + high electronegativity of N, O, F
Boiling point of water ()
Boiling point of water ()
100°C
Effect of H-bonding on boiling points
Effect of H-bonding on boiling points
Much higher boiling points
Reason ice floats
Reason ice floats
Hydrogen bonding in water
'Like dissolves like' rule
'Like dissolves like' rule
Polar dissolves in polar; non-polar in non-polar
Polar & non-polar substance mixing
Polar & non-polar substance mixing
Do not mix well