electrolysis

Question 1

electrolysis

Answer 1

the decomposition of the electrolyte using electricity

Question 2

electrolyte

Answer 2

ionic substance with moving ions and can conduct electricity

Question 3

cation is attracted to the

Answer 3

cathode

Question 4

anion is attracted to the

Answer 4

anode

Question 5

oxidation

Answer 5

loss of electrons

Question 6

reduction

Answer 6

gain of electrons

Question 7

in aqueous electrolysis, what extra ions are present?

Answer 7

H+ and OH-

Question 8

example of molten electrolysis half equation using NaCl2

Answer 8

Na+ + e– —–> Na
2Cl- ——> Cl2 + 2e-

Question 9

example ionic compound:
NaCl2 (aq)
what ions are present

Answer 9

Na
Cl
H
OH

Question 10

rule for aqueous electrolysis at the CATHODE:
if the metal is more reactive than hydrogen…..

Answer 10

then hydrogen will form at the cathode.

Question 11

rule for aqueous electrolysis at the ANODE:
if halide ion (group 7 ion) is NOT present…

Answer 11

then oxygen molecule forms

Question 12

elements less reactive than hydrogen

Answer 12

copper-Cu
silver-Ag
gold-Au
Platinum-Pt
any other metal is more reactive than hydrogen

Question 13

electrodes used in copper electrolysis

Answer 13

pure copper at the cathode
impure copper at the anode

Question 14

electrolyte used in copper electrolysis

Answer 14

copper sulfate

Question 15

what happens at the CATHODE during copper electrolysis

Answer 15

copper ions gain electrons to become copper atoms

cathode increases in mass as copper is added

Question 16

what happens at the ANODE during copper electrolysis

Answer 16

copper ions leave the anode which causes it to lose mass and form anode sludge
copper is oxidised at the anode
copper is less reactive than the anode

Question 17

what happens to the electrolyte during copper electrolysis

Answer 17

nothing happens