SI
11/15/12
CHEM177
Exam 4 Review
Dr. Jenks
Lauren D.
Content Covered:
Label the Born-Haber Cycle with the following terms and define the terms in
your own words:
.
Na+(g)+Cl(g)
.
Na+(g)+Cl-(g)
Electron Affinity
Na(g) + Cl(g)
Ionization Energy
ΔHLattice
ΔHFormation
ΔHSublimation
ΔHDissociation
Na(g)+1/2Cl2(g)
Na(s)+1/2Cl2(g)
.
NaCl(s)
.
Rank the following molecules from strongest bond to weakest bond:
KCl
NaCl
MgCl2
MgS
LiCl
Which molecule below is going to show a Heteronuclear Bond Dissociation
Energy that is greater than the average of its respective Homonuclear Bond
Dissociation Energies?
a) P-H
Use the following equation
b) O-H
as a way to reason through BDE= BDEA+BDEB + (XA-XB)2eV
c) C-S
to an answer :
2
Find ΔH° for the following reaction given the following bond energies:
2H2(g)+O2(g)2H2O(g)
Assume we start with 5.2 grams of H2
and excess O2.
Bond Bond Energy
(kJ/mol)
H-H
436
O=O 499
O-H
463
What is the orbital diagram for Oxygen before and after hybridization in H2O?
(Boxes and arrows)
Draw the Lewis Dot Structure for the following atoms and Molecules:
SI
11/15/12
BCl3
CHEM177
Exam 4 Review
IF3
CH2O
NO2-
Dr. Jenks
Lauren D.
O3
SCN (Careful here, draw
the best resonance structure)
-
Determine the formal charges on the above molecules.
Describe the hybridization of each of their central atoms. (ignore IF3)
(use the space below, and label sigma and pi bonds)
-
Name their electronic geometries in the space below
(draw if necessary/helpful)
-
Name their molecular geometries, describe bond angles
-
Indicate their polarity.
-
Determine the bond order on the central atom.
Draw the bonding and antibonding orbitals for the following P orbital
interactions:
Are these sigma or pi?
Are these sigma or pi?