Galvanic or Voltaic Cell

Concept #1: Galvanic or Voltaic cells represent spontaneous electrochemical cells that produce or discharge electricity. 

Electrolytic Cell 

Concept #2: Electrolytic Cells represent nonspontaneous electrochemical cells that consume electricity. 

Line Notation 

Concept #3: Line notation is a quick, simple method to describe an electrochemical cell without having to draw it out in detail. 

Example #1: Write the half reactions as well as the overall net ionic equation for the following line notation:

Cu | Cu2+ (aq, 0.0050 M) || Ag+(aq, 0.50 M) | Ag

Example #2: Sketch the galvanic cell and determine the cell notation for the following redox reaction:

2 H+ (aq) + Fe (s) ⇌ H2 (g) + Fe2+ (aq)

Practice: Sketch the galvanic cell and determine the line notation for the following redox reaction:

Ni2+ (aq) + Mg (s) ⇌ Ni (s) + Mg 2+ (aq)