Extracting Metals

Question 1

What is oxidation?

Answer 1

The addition of oxygen to an equation

Question 2

What is reduction?

Answer 2

When oxygen is reduced or removed in a reaction

Question 3

What is more reactive:

1. Potassium or Sodium
2. Calcium or Zinc
3. Gold or silver
4. carbon or hydrogen

Answer 3

1. potassium
2. calcium
3. silver
4. carbon

Question 4

How do you test for reactive metals?

Answer 4

Burning splint test

Question 5

What happens in displacement reactions?

Answer 5

More reactive elements react to take the place of less reactive elements

Question 6

Types of extraction of metals?

Answer 6

Ores:mined in to earth and metals can be extracted from the ground.

Electrolysis:metals higher than carbon in reactivity are extracted by electrolysis

Reduction using carbon:metals below carbon in reactivity series extracted by reduction using carbon.

Bioleaching:uses bacteria to separate metals from their ores.

Phytoextraction:growing plants in soil that contains metal compounds

Question 7

Compare electrolysis with reduction of carbon?

Answer 7

Electrolysis more expensive

Question 8

Importance of recycling?

Answer 8

Conserves resources and energy
Protects environment
Beneficial for economy as metal is expensive and and recycling means metals can be reused

Question 9

What are the 4 stages in the life cycle assessment?

Answer 9

1. choice of material-metals have to be mined or extracted and raw material comes from crude oil
2. manufacture-uses lots of energy causes air pollution
3. product use-paint gives of toxic fumes and burning fuels release green house gases
4. disposal-product disposed to landfill sites this takes space and can pollute land and water