20.8 – 20.9 Student Notes

VI. Some Commercial Voltaic Cells

A. Zinc-Carbon (Leclanche dry cell)

1. Def –

2. Reactions

3. Other characteristics

B. Alkaline Dry Cell

1. Def –

2. Reactions

3. Other characteristics

C. Lithium-iodine Battery

1. Def –

2. Description of cell

3. Other characteristics

D. Lead storage cell

1. Def –

2. Reactions

3. Other characteristics

E. Nickel-cadmium cell (nicad cell)

1. Def –

2. Reaction

3. Other characteristics

F. Fuel Cell

1. Def –

2. Reactions

G. Control Corrosion

1. Corrosion is an electrochemical process

2. What happens when an item rusts?

3. Cathodic protection

Using sacrificial anodes –

4. Concept Check

Keeping in mind that seawater contains a number of ions, explain why seawater corrodes iron much faster than freshwater.

VII. Electrolytic Cells

A. Electrolysis of Molten Salts

1. Background info

a. Electrolytic cell –

b. Electrolysis –

2. Electrolysis of molten salts

a. Cathode and anode are the _____ for electrolytic cell as a voltaic cell

b. Downs cell –

c. Molten –

d. Write the half-reactions for the electrolysis of the following molten compounds:

a. KCl

b. KOH