Intermolecular Forces
What are the 3 IMFs?
h bonding, dipole-dipole, dispersion
What bonding type uses a sea of electrons?
metallic
CuSO4
what do you use to determine the polarity of individual bonds?
EN values
what is the first step when drawing a lewis structure?
look at periodic table and find valence # of each atom
what is the weakest IMF?
dispersion
proportional
the formula for acetate:
CH3COO-
greater or equal to 2.0
how do you check if your lewis structure is correct?
formal charges
dipole-dipole or h bonding
T/F: brittleness is a trait of metals?
false
what is the charge on phosphate?
3-
what is the molecular polarity of sulfur dioxide
polar!
what is the formula (short cut method) to find formal charges?
valence # - unshared electrons around the atom
which of the following has the highest boiling point?:
Hydrogen fluoride and dihydrogen monoxide
HF
what happen if you took a hammer and hit an ionic compound with it? what would happen if you took that same hammer and hit it on a metallic compound?
Ionic: shatter, the bonds would break apart due to lattice structure
Metallic: bend or reshape because atoms slide past slides past each other
give the formula: plumbic oxide
PbO
bond: each bond is ionic because EN difference is 2.0
molecule: each dipole is facing towards F. The dipoles counterbalance each other, therefore making the molecule nonpolar.
yes
What is the key IMF in CH3NO2
dipole-dipole interactions
MgF and KF are compared: MgF has a lattice energy 10x higher than KF...why?
MgF: charge = 2
KF: charge = 1
MgF: Mg has smaller atomic size = larger LE
KF: K has bigger atomic size = smaller LE
give the formula: sulfur trioxide
SO3
______ tells you if the bonds are polar ____ tells you if the molecule is polar
EN values, shape
how do you determine which resonance structure contributes most to the resonance hybrid?
use formal charges: want lowest formal charges/ 0 is preferred/ negative formal charges on most EN atom