Quiz 4B
DL SEC
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Grade:
02/14/11
Last 6 digits of student ID
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Last name, first name:
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First three letters of your last name
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Useful formulae:
Δ
E
th
=mc
p
Δ
T;
Δ
E
bond
=±
Δ
m
Δ
H;
N
A
= 6x10
23
;
E
bond
=
Σ
all
pairs
(PE
pairwise
) ;
E
total
= sum of all relevant energies;
Δ
E
open
=
Σ
Δ
E
i
= Q+W;
Δ
E
closed
=
Σ
Δ
E
i
=
0
This Quiz Has Two Sides!
Problem 1.
The picture to the right shows a very
small piece of a large twodimensional solid. The
entire solid has N atoms.
(Assume N is large enough
so that the number of atoms on the edge is not a large
fraction of N, so you can treat all atoms as if they are
on the interior of the substance.)
Each pair of atoms has
the potential energy shown in the adjacent figure.
[Recall 1 Å(Angstrom) = 10
10
m.]
a)
What is the number of nearest neighbors for each atom in the interior
of this solid?
4
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 Winter '08
 PARDINI
 Energy, Kinetic Energy, Potential Energy, atoms

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