Topic 4 - Iron Flashcards
1
Q
what is the corrosion of iron called?
A
rusting
2
Q
what does iron need to be in contact with to rust?
A
oxygen and water
3
Q
what type of reaction takes place when iron corrodes?
A
an oxidation reaction
4
Q
what is the word equation for rusting?
A
iron + oxygen + water = hydrated iron(III) oxide
5
Q
what are the two main ways to prevent rusting?
A
- barrier method
- sacrificial method
6
Q
how does the barrier method prevent rusting?
A
the barrier keeps water and oxygen out
7
Q
how does the sacrificial method prevent rusting?
A
a more reactive metal is placed with the iron, so the more reactive metal will be oxidised instead of the iron
