c6.1.11 corrosion Flashcards
1
Q
corrosion
A
metal reacting with its surroundings
2
Q
rusting
A
specifically, steel (or iron) rusting
3
Q
what reaction is rusting
A
redox reaction
4
Q
word equation for rusting
A
iron + oxygen + water –> hydrated iron(3) oxide
5
Q
symbol equation for rusting
A
4Fe + 3O2 +2H2O –> 2Fe2O3.H20
6
Q
is there a catalyst for rusting
A
salt
7
Q
investigating rust
A
set up 3 nails in 3 test tubes
1. anhydrous calcium chloride and put a bung on the top
2. boiled (and sometimes a layer of oil) water and bung on top
3. air and water access
only the third one will rust
8
Q
when does silver react with oxygen
A
in the presence of hydrogen sulfide, it will corrode.
