5 Methods of extraction

Question 1

Name the 5 methods of extraction

Answer 1

• Reduction
• Electrolysis
• Displacement
• Phytomining
• Bioleaching

Question 2

Which of the 5 methods of extraction are least harmful to the enviroment

Answer 2

• Phytomining

- Bioleaching

Question 3

What is reduction

Answer 3

• The removal of oxygen

- Carbon is used to reduce metal oxides below it in reactivity series

Question 4

When can carbon be used in reduction

Answer 4

only to reduce those metals that are below it in the reactivity series

Question 5

What is electrolysis

Answer 5

• The breakdown of an ionic compound using electricity

- Used for metals more reactive than carbon

Question 6

Why is electrolysis bad

Answer 6

• It consumes lots of energy
• it has many staged
• it produces CO2 which causes climate change

Question 7

What is displacement

Answer 7

• When a more reactive metal pushes out a less reactive metal from its compound
• Can be used for most metals

Question 8

Displacement example:

Zinc + Iron chloride —>

Answer 8

zinc chloride + iron

Question 9

Explain Phytomining

Answer 9

• Plant plants into soil with a high concentration of desired metal ion
• Metal ion gradually builds up in leaves
• Plants are harvest and burnt to ash
• Metal ion purified from leaves
• Filter the ash and the desired metal ion will be left on filter paper

Question 10

What is Bioleaching

Answer 10

• When bacteria is used to extract a metal from its compound

Question 11

Explain Bioleaching

Answer 11

• bacteria use up the energy in a bond
• This results in a Leachate solution
• Filtration separates metal from solution