Transcript Document

Compound
Solubility
Melting
Time
Conductivity in
solution
Conductivity as
solid
Main focus on conductivity
We observe 2 types of behavior among compounds:
 One type of compound does NOT conduct electricity either as a solid or as a
liquid
 Composed of neutral accumulations of atoms we call molecules
 Behavior is typical of compounds of nonmetals, but there are exceptions
 The other type of compound does not conduct as a solid, but it does when
dissolved
 Dissolving into oppositely charged particles we call “ions” that can move freely
in a solution
 The presence of an electric field causes these charged particles (ions) to
migrate which results in an electrical current
 Behavior typical of metal and nonmetal together
So what’s happening at the molecular
level when these compounds dissolve?
Conductivity of solid CuCl2 and in
solution
Discussion
• Why do the metal ions change from being soluble in solution
to insoluble at the surface of the cathode?
• Why do the nonmetal ions change from being soluble in
solution to insoluble at the surface of the anode?