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Products from rocks
Why can gold be found in the Earth's crust in its native state?
Gold is very rare.
Gold is very unreactive.
Gold is more reactive than silver.
Why is aluminium extracted from aluminium ore by electrolysis?
Aluminium is more reactive than carbon.
Aluminium is less reactive than carbon.
Aluminium is an expensive metal.
Why is iron extracted from iron ore by reduction with carbon or carbon monoxide?
Iron is more reactive than carbon.
Iron is less reactive than carbon.
Iron is a cheap metal.
Which properties make aluminium suitable for overhead mains electricity cables?
It has a low density and is a good conductor of electricity.
It is shiny and is a good conductor of heat.
It is a good conductor of electricity and heat.
What happens to iron oxide in a blast furnace?
It is oxidised to form iron.
It is electrolysed to form iron.
It is reduced to form iron.
In comparison with steel, what is pure iron like?
What is the percentage of iron in the iron from a blast furnace?
Which type of steel is likely to be used for making cutlery?
Low carbon steel
High carbon steel
Why are alloys likely to be harder than pure metals?
Because layers of atoms can slide over each other easily.
Because layers of atoms cannot slide over each other easily.
Because their atoms are denser and harder than those of pure metals.
Transition metals are like other metals in what ways?
They are dull.
They are good conductors of electricity.
They are on the right hand side of the periodic table.
What process is used to purify copper?
Reduction in a blast furnace
Why does aluminium not corrode quickly?
It is an unreactive metal.
It has a thin layer of aluminium oxide on its surface.
It reacts with oxygen but not with water.
Why is titanium expensive to extract from its ore?
It resists corrosion.
Several stages are involved.
Its ore is rare.