Electrolysis

Question 1

What is electrolysis

Answer 1

Use of electrical current to break down compounds containing ions into their constituent elements

Question 2

What is substance being broken down called

Answer 2

Electrolyte

Question 3

Where do negatively charged ions go

Answer 3

Move to anode(positive electrode)

Question 4

Where do positively charged ions go

Answer 4

Move to cathode(negative electrode)

Question 5

What does electrolysis require

Answer 5

Lots of heat and electrical energy
Expensive

Question 6

How is aluminium obtained

Answer 6

By electrolysis of aluminium oxide mixed with cryolite

Question 7

What is cryolite

Answer 7

A compound of aluminium

Question 8

How does the cryolite work

Answer 8

Lowers melting point of aluminium oxide meaning less energy required and cheaper

Question 9

Where does aluminium form

Answer 9

Negative electrode (cathode)

Question 10

Oxygen gas

Answer 10

Positive electrode(anode)
Reacts with carbon forming carbon dioxide

Question 11

Electrolysis in aqueous solutions

Answer 11

Ionic compounds dissolved in water, slightly harder to predict products of electrolysis

Question 12

Negative electrode(cathode)

Answer 12

Hydrogen produced if metal is more reactive than hydrogen
Metal produced if metal is less reactive than hydrogen

Question 13

Positive electrode( anode)

Answer 13

Oxygen produced unless solution contains halide ions
If Halide ions present then halogen produced