CHEM 1A: Challenge Problem Set 7
1. Using only a periodic table, sort the ionic compounds below from smallest lattice energy
to largest lattice energy.
LiF < NaCl < KBr
LiF < KBr < NaCl
KBr < LiF < NaCl
KBr < NaCl < LiF
NaCl< KBr < LiF
NaCl < LiF < KBr
2. Using only a periodic table, sort the ionic compounds below from smallest lattice energy to largest
lattice energy.
LiF < CaO < AlN
LiF < AlN < CaO
AlN < LiF < CaO
AlN < CaO < LiF
CaO < LiF < AlN
CaO < AlN < LiF
3. Using only Lewis dot structures and VSEPR Theory, select all of the molecules below that have
their atoms exclusively in ONE PLANE. For example, linear, trigonal planar, and square planar
electron geometries have shapes with all of the atoms in one plane--the entire molecule and all of
its atoms can fit in one plane--it's flat.
Correct!
SO2
Correct!
OF2
Correct!
SO3
SOCl2
Corrct!
COCl2
SF4
NF3
BrF5
Correct!
XeF4