Anode

Definition

An anode is the electrode where oxidation occurs and electrons are given off in a direct-current circuit. It is typically considered the positive terminal in a device like a battery.

5 Must Know Facts For Your Next Test

1. In electrochemical cells, the anode is where oxidation occurs.
2. The anode is usually marked with a '+' sign in batteries.
3. Electrons flow away from the anode toward the cathode in a circuit.
4. In galvanic cells, the anode is negatively charged because it releases electrons.
5. In electrolytic cells, the anode is positively charged as it attracts negative ions.

Review Questions

• What process occurs at the anode in a direct-current circuit?
• How does electron flow behave relative to the anode in a battery?
• Why might the charge of an anode differ between galvanic and electrolytic cells?

Related terms

Cathode: The electrode where reduction occurs and electrons are gained; often considered the negative terminal in devices like batteries.

Oxidation: A chemical reaction involving the loss of electrons from a substance; occurs at the anode.

Electrolyte: A substance containing free ions that make it electrically conductive, used in batteries to facilitate ion flow between electrodes.