CHM 1045 – WORKSHEET – THIRD HOUR EXAM
Name _________KEY_____________________
QUIZ 6 – Due in class 11/14/2016 (Monday)
Panther ID _____________________________
1) Give Lewis structures for the following molecules or ions. Also give the electron cloud geometry, the
molecular geometry, and the hybridization for the central atom.
a) I3-
electron cloud trigonal bipyramid
molecular linear
hybridization of central I atom sp3d
b) SO2Cl2 (all atoms directly bonded to central S atom)
electron cloud tetrahedral
molecular tetrahedral hybridization of central S atom sp3
2) Give all of the plausible resonance structures for each of the following molecules or ions.
a) SO3 (there are other resonance structures, but they have nonzero formal charges for some
atoms)
b) HN3 (linear molecule, so H N N N arrangement of atoms)
c) NO2
3) Assign formal charges for each of the following molecules or ions. Also predict the molecular
geometry for each central atom.
a) ClO2-
b) CH2N2
molecular geometry (Cl)
molecular geometry (C)
nonlinear
molecular geometry (N)
trigonal planar
linear
4) Give the electron configuration for the O2- anion, using the MO diagram given below. Also find the
bond order and the number of unpaired electron spins for the anion.
Electron configuration (2s)2(2s*)2(2p)2(2p)4(2p*)3
bond order
___3/2_____
# unpaired e-
____1_____
5) Balance the following chemical equations:
a)
__2__ C6H14 + _19____ O2  _12__ CO2 + _14__ H2O
b)
_____ CaC2 + __2__ H2O  _____ Ca(OH)2 + _____ C2H2
c)
_____ C2H8N2 + __2__ N2O4  __3__ N2 + __2__ CO2 + __4__ H2O
d)
_____ UO2 + __4__ HF  _____ UF4 + __2__ H2O
6) Balance the molecular equation, and write the total ionic and net ionic equations for the following
reactions.
a)
__2__ NaBr(aq) + Pb(NO3)2(aq)  2 NaNO3(aq) + PbBr2(s)
TOTAL IONIC
2 Na+(aq) + 2 Br-(aq) + Pb2+(aq) +2 NO3-(aq)  2 Na+(aq) + 2 NO3-(aq) + PbBr2(s)
NET IONIC
Pb2+(aq) + 2 Br-(aq)  PbBr2(s)
b)
__2__ HNO2(aq) + _____ Ba(OH)2(aq)  Ba(NO2)2(s) + 2 H2O()
TOTAL IONIC
2 HNO2(aq) + Ba2+(aq) + 2 OH-(aq)  Ba(NO2)2(s) + 2 H2O()
NET IONIC
2 HNO2(aq) + Ba2+(aq) + 2 OH-(aq)  Ba(NO2)2(s) + 2 H2O() (the same as the total ionic)
7) Give the oxidation number for sulfur (S) in the following molecules or ions
oxidation number (S)
a) H2S
b) HSO3-
c) SOF2
d) S8
___-2___
___+4___
___+4___
___0____