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📘 Split the diagram into two half-cells

Split the cell into two half-cells first. Each side has an electrode, an electrolyte, and a half-reaction waiting to be labeled.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Cell layout and electrodesIdentify half-cells, anode, cathode, and external electron flow.Oxidation is at the anode; reduction is at the cathode; electrons travel through the wire.
  2. Ions and notationExplain salt-bridge ion migration and translate diagrams into cell notation.Ions balance charge in solution while electrons move through the metal circuit.
  3. Read any cell diagramApply reaction-based definitions to galvanic and electrolytic cells.Electrode names follow oxidation and reduction, not permanent plus/minus labels.

Questions this course answers

Where does oxidation occur?

The anode is defined as the electrode where oxidation occurs.

What carries electrons between half-cells?

Electrons move through the metallic external circuit.

What is the salt bridge's main role?

Ion migration prevents charge buildup in the half-cells.

What does the double line in cell notation represent?

The double line conventionally marks the salt bridge or liquid junction.

What rule works in both galvanic and electrolytic cells?

Electrode names are defined by oxidation and reduction, not by sign.

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