3.1.11- Electrode potentials and electrochemical cells (PAPER 1)

Question 1

What is a half cell?

Answer 1

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.

Question 2

What are the 3 types of electrode?

Answer 2

Metal, gas, redox

Question 3

What would the half equation be for an iron electrode dipped in a solution of Fe2+? METAL ELECTRODE

Answer 3

Fe2+ (aq) + 2e- ⇌ Fe (s)

Question 4

What occurs if some metals do not have a solid version to be the electrode? REDOX ELECTRODE

Answer 4

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.

Question 5

What would the half equation be for 2 aqueous ions of iron?

Answer 5

Fe3+ (aq) + e- ⇌ Fe2+ (aq)

Question 6

What occurs with a gas and a solution of its ions? GAS ELECTRODE

Answer 6

An inert, electrically conductive electrode is used- usually platinum. A gas and a solution of its ions used.

Question 7

How is an electrochemical cell formed?

Answer 7

By joining 2 half cells together with a wire, voltmeter and salt bridge.

Question 8

What is the movement of electrons in an electrochemical cell?

Answer 8

From a more reactive metal to a less reactive one.