Electrolysis

Question 0

What is losing electrons called?

Answer 0

Oxidisation

Question 1

What is gaining electrons called?

Answer 1

Reduction

Question 2

What happens when 2 ions go to the same electrode?

Answer 2

The least reactive is discharged.

Question 3

Why is carbon dioxide given off at the positive electrode during the extraction of aluminium?

Answer 3

Because the oxygen given off reacts with the hot, positive carbon electrodes, making carbon dioxide gas, this is why the carbon cells need to be replaced regularly.

Question 4

Why is cryolite used in the extraction of aluminum?

Answer 4

Because aluminum has a very high melting point and using this cryolite reduces it’s melting point and therefor energy costs.

Question 5

What are the 3 products produced when we electrolyze brine?

Answer 5

Chlorine gas at the positive electrode, hydrogen at the negative electrode and sodium hydroxide solution.

Question 6

What are uses for chlorine?

Answer 6

Bleach

Question 7

What are uses for hydrogen?

Answer 7

Can be used in the process of making margarine

Question 8

What are the uses for sodium hydroxide?

Answer 8

Can be used for soap and bleach