Three Dimensional AND Moving Images Of Sodium Chloride
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Chemistry 105a
Fall 1998
Professors Mak & Bau/MWF 9-10, 11-12
This page is
specifically for students of the MWF 9-10 and 11-12
sections taught by Profs. Mak and Bau.
Students of other sections please go
here.
THE 3
PHASES OF SODIUM CHLORIDE
-- SALT
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1. SOLID NaCl is an ionic crystal at room temperature, with its sodium and chlorine atoms arranged in almost a regular array we call a "lattice". Because of thermal agitation, the atoms vibrate, but they remain close to their preferred positions on the lattice. Rotate the structure and you will notice that there are well-defined planes. The crystal cleaves easily along these directions. |
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2. LIQUID At 800C, NaCl melts into a liquid. In the liquid state, the regular lattice structure of the solid is completely lost, but the mobility of the atoms remain low. In other words, the liquids is still quite viscous. |
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3. GAS At 1400C, NaCl boils and becomes a gas. The gaseous state has no regular order and atoms travel large distances without interacting with one another. In fact, in most gases, the atoms are so far apart that they can be considered noninteracting. We call this the "ideal gas" behavior. |
Copyright 1997, USC
Department of Chemistry. ALL RIGHTS RESERVED.
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This page designed by
C.H. Mak and
maintained by
Aaron Potter.
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