3.1.11- Electrode potentials and electrochemical cells (PAPER 1)
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What is a half cell?
Half of an electrochemical cell. Can be constructed of a metal dipped in its ions or a platinum electrode with 2 aqueous ions, or a gas and solution of its ions.
What are the 3 types of electrode?
Metal, gas, redox
What would the half equation be for an iron electrode dipped in a solution of Fe2+? METAL ELECTRODE
Fe2+ (aq) + 2e- ⇌ Fe (s)
What occurs if some metals do not have a solid version to be the electrode? REDOX ELECTRODE
If the half cell has 2 aqueous ions we must use an inert but electrically conductive electrode- usually platinum. 2 different ions of same element.
What would the half equation be for 2 aqueous ions of iron?
Fe3+ (aq) + e- ⇌ Fe2+ (aq)
What occurs with a gas and a solution of its ions? GAS ELECTRODE
An inert, electrically conductive electrode is used- usually platinum. A gas and a solution of its ions used.
How is an electrochemical cell formed?
By joining 2 half cells together with a wire, voltmeter and salt bridge.
What is the movement of electrons in an electrochemical cell?
From a more reactive metal to a less reactive one.