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

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

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 | Cu** ^{2+}** (aq, 0.0050 M)

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

2 H** ^{+}** (aq) + Fe (s) ⇌ H

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

Ni** ^{2+}** (aq) + Mg (s) ⇌ Ni (s) + Mg