C10 Electrolysis

Question 1

What is electrolysis?

Answer 1

Process of using electricity to extract elements from a compound

Question 2

What is the name of the positive electrode?

Answer 2

Anode

Question 3

What is the name of the negative electrode?

Answer 3

Cathode

Question 4

What is an electrolyte?

Answer 4

Liquid or solution that contains ions and so can conduct electricity

Question 5

Where are metals formed during electrolysis?

Answer 5

Cathode

Question 6

Where are non-metals formed during electrolysis?

Answer 6

Anode

Question 7

How can ionic substances be electrolysed?

Answer 7

By melting or dissolving them and then passing DC through them

Question 8

Why can solid ionic substances not be electrolysed?

Answer 8

Ions cannot move

Question 9

In the electrolysis of solutions, when is a metal NOT produced at the cathode?

Answer 9

When the metals is more reactive than hydrogen

Question 10

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

Answer 10

halogen

Question 11

What is the half equation for the ionisation of water?

Answer 11

H20 –> H+ + OH-

Question 12

What metals are extracted from ionic compounds by using electrolysis?

Answer 12

Metals more reactive than carbon

Question 13

In the electrolysis of aluminium oxide, what are the anodes made of?

Answer 13

Graphite

Question 14

In the electrolysis of aluminium oxide, why do the anodes need to be replaced?

Answer 14

As they react with the oxygen that is formed

Question 15

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

Answer 15

oxygen

Question 16

PANIC

Answer 16

Positive
Anode
Negative
Is
Cathode

Question 17

What substance is aluminium oxide mixed with before electrolysis to lower the melting point?

Answer 17

Cryolite

Question 18

Why is cryolite used in electrolysis of aluminium?

Answer 18

Aluminium oxide can dissolve in molten cryolite

Lower melting point therefore lower energy cost and more profit