First 81 words of the document:
Looking at the reactivity series you can see which metals
are more reactive than others.
Zinc oxide + magnesium magnesium oxide + zinc
Iron sulphate + magnesium magnesium sulphate + iron
Magnesium sulphate + copper Magnesium sulphate + copper
Reactions such as these are called displacement reactions.
In general a more reactive metal will displace a less reactive
As magnesium is more reactive than copper they stay the
same with no displacement.