Electrolysis

Question 1

Electrolysis

Answer 1

The breaking down of a compound using electricity

Question 2

Electrodes

Answer 2

Two electrodes which connect the substance to the circuit

Question 3

positive electrode

Answer 3

anode

Question 4

negative electrode

Answer 4

cathode

Question 5

What are electrodes made of

Answer 5

solids that conduct electricity but are unreactive

Question 6

Electrolyte

Answer 6

The substance being broken down

Question 7

positive ions

Answer 7

attracted to the cathode

Question 8

negative ions

Answer 8

attracted to anode

Question 9

At the anode - positive elctrode

Answer 9

non-metal ions lose electrons to form molecules

Ions go back to neutral

Question 10

At the cathode - negative electrode

Answer 10

metal ions gain electrons to form atoms

Ions go back to neutral

Question 11

What happens at the anode

Answer 11

If a halide ion is present then element is produced as normal

If a halide ion is not present oxygen and water are produced

Question 12

Half equation for halide being produced at anode - Chlorine

Answer 12

2Cl- –> Cl2 + 2e-

Question 13

Half equation for water and oxygen being produced at anode

Answer 13

4OH- –> O2 + 2H2O + 4e-

Question 14

What happens at the cathode

Answer 14

if the metal is less reactive than hydrogen than it is produced

if the metal is more reactive than hydrogen, hydrogen is produced

Question 15

Half equation for hydrogen being produced at cathode

Answer 15

2H+ + 2e- –> H2