Advanced Placement Chemistry 1985 Free Response Questions
9)
Substance
|
Melting Point (oC)
|
H2
|
-129
|
C3H8
|
-190
|
HF
|
-92
|
CsI
|
621
|
LiF
|
870
|
SiC
|
>2,000
|
(a) Discuss how the trend in the melting points of the
substances tabulated above can be explained in terms of the types
of attractive forces and/or bonds in these substances.
(b) For any pairs of substances that have the same kind(s) of
attractive forces and/or bonds, discuss the factors that cause
variation in the strengths of the forces and/or bonds.
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