2(e) Extractions and uses of metals Flashcards
1
Q
Ore
A
Rocks that contain enough of a mineral for it to be worthwhile extracting the metal from it
2
Q
Where are most metals extracted?
A
from ores found in the Earth’s crust
3
Q
How are unreactive metals found in the Earth’s crust?
A
As an uncombined element
4
Q
What does method of extraction depend on?
A
- Its reactivity compared to carbon
5
Q
Method of extraction: Iron
A
Carbon extraction
6
Q
Method of extraction: Aluminium
A
Electrolysis
7
Q
Economic factors for extraction
A
- Cost of energy
- Cost of reducing agent
8
Q
How to extract metals using carbon
A
Heat with carbon.
Redox, reducing agent = carbon
9
Q
How to extract metals using electrolysis
A
- Aluminium oxide is dissolved in cryolite (molten salt) -> to lower boiling point
- Expensive
10
Q
How to extract metals using electrolysis
A
- Aluminium oxide is dissolved in cryolite (molten salt) -> to lower boiling point
- Expensive
11
Q
Uses of aluminium
A
- Foil
- Bottle cans
- Aircraft body
12
Q
Properties of aluminium
A
- Low density
- Strong
13
Q
Uses of low - carbon steel
A
- Car bodies
- Bridges
14
Q
Properties of low-carbon steel
A
High density
15
Q
Uses of high-carbon steel
A
Cutting tools
