C6 - Electrolysis

Question 1

electrolysis

Answer 1

breakdown of a substance by electricity

Question 2

electrolyte

Answer 2

compound that is broken down
-either molten/dissolved

Question 3

anode

Answer 3

+ electrode

Question 4

electrode

Answer 4

-rods that conduct electricity

Question 5

cathode

Answer 5

• electrode

Question 6

cation

Answer 6

+ve ion

Question 7

anion

Answer 7

-ve ion

Question 8

why are electrodes made from unreactive metals

Answer 8

so they do not react with the product made

Question 9

during electrolysis, what happens to ions at electrodes

Answer 9

-cations move towards the cathode
-anions move towards the anode
-opposites attract

Question 10

when ions reach electrodes

Answer 10

they lose charge
- become elements

Question 11

what happens to metal below hydrogen on the reactivity series

Answer 11

they are deposited in the aqueous solution

Question 12

what happens if 2 products are made at the electrodes

Answer 12

less reactive one is deposited

Question 13

if halide ions are present

Answer 13

the halogen is always formed

Question 14

cryolite

Answer 14

reduces melting point of aluminium oxide
-less energy is used
-melting point become 850.c

Question 15

why do carbon anodes need to be replaced regularly

Answer 15

as o2 reacts to form co2
-they wear away after awhile

Question 16

brine

Answer 16

-concentrated sodium chloride solution
-dissolved in water = solution

Question 17

elecrolysis of brine = products

Answer 17

-chlorine gas at anode
-H2 at cathode
-sodium hydroxide solution