Chemistry / Unit 8 Chem 1463 short lesson, about 20 seconds
Molecular Solids
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The idea
A molecular solid is held by intermolecular forces between intact neutral molecules, giving lower melting points than the other three solid types.
In practice
Solid carbon dioxide sublimes at -78 °C, while iodine's larger, more polarizable molecules hold together enough to melt at 114 °C.
Where people slip
A molecular solid's melting point tracks intermolecular force strength, not any internal bond, which stays intact regardless of temperature.
Your place on the trail
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