Chem 7.2 Polar Molecules and Intermolecular Forces Flashcards
H2O is a polar molecule because
It has polar bonds and its bond dipoles add together resulting in an overall molecular charge
In h2o oxygen atom pulls the bonding electrons in ___________ directions
Similar
In CO2, the oxygen atoms pull the bonding e in ____________ and ___________ directions
Equal and opposite
Why is CO2 nonpolar
It has polar bonds, but its bond dipoles cancel each other out resulting in no overall molecular dipole.
Asymmetrical molecules (lone pair on central atom) are
Polar
Symmetrical molecules are
Nonpolar
If both molecules have oppositely charges ends, what does that mean
The attraction is very strong
A covalent bond is _______________ molecule
Within one
And intermolecular force is ________________ molecules
Between 2
Dipole dipole forces are the attraction between
2 polar molecules
What type of dipoles do 2 molecules have
Permanent
What is polarity caused by
Electrons
What are dispersion forces
The attraction between two nonpolar molecules
What are dispersion forces caused by
Random motions of e in the molecule
What type of dipoles are involved in dispersion forces
Temporary dipole —> induced dipole
Whats hydrogen bonding
The attraction between 2 very polar molecules
Covalent bonds between which forces can develop h bonds between molecules
H and O, N, F
Hydrogen bonds are simply
Very strong dipole-dipole forces
