Lewis Structures/Formal Charge
VSEPR, Hybridization, and Bonding
Intermolecular Forces
Percent Mass, Empirical Formulas, and Molecular Formulas
Other Exam Questions
100
What is the correct Lewis Dot Structure of H2O?
100
What is the Electron Geometry, Molecular Shape, and Bond Angle of CH4?
EG= Tetrahedral
MS= Tetrahedral
Bond Angle= 109.5o
100
What IMF is the only force exhibited in non polar molecules?
London Dispersion
100
If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced?
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
30.8 grams
100
Which of these molecules is an Ionic Compound?
H2O
CH4
KF
CH3CH2CH(O)
KF
200
What is the Lewis Structure of SO2?
200
What is the Hybridization of the central atom in SF4?
sp3d
(5 Domains)
200
Rank the IMFs in order of strength (Lowest to Highest) *Hint there are FOUR*
LD < Dip-Dip < HB < Ion-D
200
What is the empirical formula for ethyl fluoride if the compound contains 49.97% carbon, 10.51% hydrogen, and 39.52% fluorine by mass?
C2H5F
200
Which molecule(s) is/are polar?
H2O
CH3CH2
BF2Br
H2O and BF2Br
300
What is the formal charge of all of the O atoms in PO43-? (Hint: Draw the LDS)
P-O: -1
P=O: 0
300
If a molecule has three atoms connected to the central atom, along with one lone pair, what is the molecular shape of this molecule? What is the bond angle?
Trigonal Pyramidal and 109.5o
300
Rank these molecules from lowest to highest boiling point.
Br2
NH3
HBr
Br2 < HBr < NH3
300
How many sulfur atoms are in 25.6 g of Al2(S2O3)3?
2.37 x 1023 S atoms
300
Which molecule has a greater lattice energy?
LiF or NaF
NaF
400
What is the Formal Charge of Xe in XeOF4?
FC of Xe: -1
400
What is the electron geometry of IF4- ?
EG: Octahedral
400
Which has the highest boiling point?
HBr or H2S or HCl
HCl
400
Caffeine has an elemental analysis of 49.48% C,
5.190% H, 16.47% O, and 28.85% N. It has a
molar mass of 194.19 g/mol. What is the molecular
formula of caffeine?
C8H10N4O2
400
How many sigma and pi bonds are in this molecule?
6 sigma
3 pi
500
Draw the structure that contributes the most to the resonance of SO32-.
500
What is the bond angle of a molecule with 2 atoms attached to the central atom and 3 lone pairs?
180o (Linear)
500
Which molecule shows greater IMFs?
H2O or Cl2
H2O (Hydrogen Bonding)
500
Determine the combined mass percent composition
of oxygen and nitrogen in Urea, CH4N2O.
73.3% combined O & N
500
The graph shows the potential energy curve for the
interaction of charged particles in an ionic
compound. Which of the pictures shown below
best depicts the particle - particle interaction at the
position indicated by the arrow?
C