Electrolysis

Question 1

what is an electrolyte

Answer 1

a liquid/solution that contains ions and so can conduct electrolysis

Question 2

in electrolysis of aluminium oxide, why do anodes need to be replaced

Answer 2

they react with oxygen being formed

Question 3

in electrolysis of aluminium oxide, why is the aluminium oxide mixed with cryolite

Answer 3

to lower the melting point, therefore requiring less energy

Question 4

what is the half equation for the ionisation of water

Answer 4

H20 (l) -> H+ (aq) + OH-(aq)

Question 5

In electrolysis of metal sulfate solution, what is produced at the anode

Answer 5

oxygen

Question 6

In electrolysis of metal halide solution, what is at the anode

Answer 6

Halogen gas

Question 7

In the electrolysis of solutions, when is the metal not produced at cathode

Answer 7

when the metal is more reactive than hydrogen

Question 8

how can ionic substances be electrolysed

Answer 8

by melting/dissolving them, then passing a direct current through

Question 9

What is the name of negative and positive electrodes

Answer 9

negative = cathode
positive = anode

Question 10

what is electrolysis

Answer 10

the process of using electricity to extract elements from a compound