Oxidation, Reduction and displacement reactions

Question 1

What is oxidation?

Answer 1

•Oxidation is when a metal gains oxygen

Question 2

What is reduction?

Answer 2

•Reduction is when a metal oxide looses oxygen

Question 3

What is a displacement reaction?

Answer 3

• A displacement reaction is when a more reactive metal displaces a less reactive metal
• Mg + CuSO -» MgSO + Cu

Question 4

How can you extract copper from an ore?

Answer 4

• By using carbon
• If you heat it with carbon the carbon will displace the copper as it is more reactive
• you will then get the copper on its own
• This applies to all metals less reactive than carbon

Question 5

How can we extract Aluminium from ore?

Answer 5

• By using molten electrolysis
• molten electrolysis is used because aluminium is not soluble in water
• At the cathode Aluminium ions will gain electrons to form Aluminium atoms
• At the anode oxide ions will lose electrons to become oxygen gas
• The oxygen will react with the carbon anode and produce Carbon dioxide so the anodes must be frequently changed out