(15) Extraction and uses of metals Flashcards
1
Q
What is an ore?
A
It is a sample of rock that contains of a mineral to be worthwhile mining.
2
Q
How do we extract metals that are below carbon in the reactivity series?
A
By heating it with carbon.
3
Q
How is the extraction of iron carried out?
A
In a blast furnace.
4
Q
How do we extract metals that are above carbon in the reactivity series?
A
By electrolysis.
5
Q
What is an alloy?
A
It is a mixture of a metal with other metals or carbon.
6
Q
Why are alloys harder than individual pure metals?
A
Since the different atoms have different sizes, they break up the regular lattice that a pure metal would have. Thus preventing the layers of ions to slide over each other.-
7
Q
How does aluminium resist corrosion?
A
It has a very thin (but strong) layer of aluminium oxide on the surface.
