20 - Electrolysis

Question 1

Electrolysis

Answer 1

The decomposition of an ionic compound when molten or in aqueous solution by electric current

Question 2

Electrolyte

Answer 2

A molten ionic compound or an aqueous solution that is decomposed during electrolysis

Question 3

Electrode

Answer 3

A rod of metal or carbon (graphite) which conducts electricity to or from an electrolyte

Question 4

What happens at the cathode?

Answer 4

Reduction

Question 5

What happens at the anode?

Answer 5

Oxidation

Question 6

Faraday

Answer 6

The quantity of electric charge (in coulombs) carried by one mole of electrons or one mole of singly charged electrons

Question 7

Electrode potential

Answer 7

The voltage measured for a half-cell compared with another half-cell

Question 8

Half-cell

Answer 8

One half an electrochemical cell which either donates electrons or receives electrons from an external circuit when connected to another half-cell

Question 9

Standard electrode potential

Answer 9

The voltage produced when a standard half-cell (ion concentration 1.00 mol dm3 at 298K) is connected to a standard hydrogen electrode under standard conditions

Question 10

Standard cell potential

Answer 10

The difference in standard electrode potential between two specified half-cells

Question 11

Feasible

Answer 11

Likely to take place

Question 12

When is a reaction feasible?

Answer 12

Standard cell potential is positive

Question 13

Discharged

Answer 13

Ions changed into atoms or molecules