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?