14 extracting and using metals Flashcards
1
Q
composition of earths crust
A
oxygen 45 %
silicon 27
aluminium 8
iron 6
calcium 5
etc etc check tb
2
Q
metal ores
A
hematite - iron mainly iron(III) oxide
bauxite - aluminium mostly aluminium oxide
gold - unreactive so found as seams of the element in rock
3
Q
14.1,14.2,14.3
A
4
Q
alloys
A
mixture of a metal with at least one other element
5
Q
examples of alloys
A
brass - zince + copper
bronze - copper + tin
