Extracting Metals and Their Uses Flashcards
what is an ore
a rock from which a metal is extracted
what is aluminium extracted from
bauxite
what is iron extracted from
haematite
how is aluminium extracted
through electrolysis
how is iron extracted
reduction with carbon
iron oxide+ carbon monoxide–> iron+carbon dioxide is the equation for what happens in a blast furnace. Why does iron oxide become just iron
it has been reduced- it has lost its oxygen
why can carbon reduce iron
because carbon is more reactive
why is aluminium extracted through electrolysis
aluminium is more reactive than carbon so we have to use electricity
why is electrolysis bad
it uses a large amount of electricity=very expensive
why is recycling aluminium a good idea
- saves lots of energy
- saves limited resources of ores
what are two copper extraction methods
- phytomining
- bio leaching
advantages of phytomining and bio leaching
low grade ores can be used which is cheap
disadvantages of bio leaching and phytomining
- they are slow
- phytomining needs good climate
- phytomining is seasonal
- require a large amount of land
two methods of purifying copper
electrolysis
displacement by more reactive scrap iron
what is an alloy
a mixture of two or more metals
