C1 3 Metals and Their Uses Flashcards
How do we find most metals?
Combined with other chemicals, often with oxygen.
Where are metals found?
In the earth’s crust.
What is a metal ore?
A rock which contains enough of the metal to make it economic to extract the metal.
What has to be done to the ore before the metal is extracted and purified?
Mined and concentrated
What does whether it is worth extracting a particular metal depend on?
- How easy it is to extract it from it’s ore
* How much metal the ore contains
What is a ‘low grade’ rock?
The rock that does not have enough metal to extract.
How may a low grade rock become an economic source of a metal?
A new cheaper method might be discovered or a new more efficient method may be found.
Which metals are found in their native state?
Gold and silver
What does native state mean?
It’s when metals are unreactive and therefore found in the earth as metals themselves.
What is the reactive series?
It shows the reactivity of metals.
How does the reactivity series help with extracting metals?
It shows the best way to extract the metal.
With oxides of metals below carbon, what can we do?
It can be reduced with carbon.
What can a more reactive metal do to a less reactive metal?
It can displace them.
What are the metals combined with oxygen called?
Metal oxides
How is carbon used to extract a metal out of its ore?
The carbon is heated with the metal oxide. The carbon displaces the metal from its ore and combines with the oxygen as carbon dioxide.
