Rusting of iron expt and prevention

1. Rusti

2. water boiled
water
layer
of
oil
A B C D E
zinc
foil
water
F
salt
water
Rusting of Iron
anhydrous
calcium
chloride

3. Results (after one week)
Tube Conditions Observation
A normal air
B air but no water
C water and dissolved air
D water but no air
E water, air and salt
F water air, and a more reactive metal

4. Results (after one week)
Tube Conditions Observation
A normal air
B air but no water
C water and dissolved air
D water but no air
E water, air and salt
F water air, and a more reactive metal
some rust
no rust
rusty
no rust
very rusty
no rust

5. Conclusion
For rusting to happen, both _____ and ______ must be present.
______ can make rusting worse.
Ways of preventing rust
Method Example
• Coat with oil or grease Bicycle chain
• Coat with layers of paint Car body
• Galvanize with zinc Nail
• Alloy with other metals Stainless steel
cutlery
• Electroplate with another metal Jewellery
• Use sacrificial protection Ship’s hull
air water
Salt
• Coat with plastic Mesh fence

6. Conclusion
For rusting to happen, both _____ and ______ must be present.
______ can make rusting worse.
Ways of preventing rust
Method Example
• Coat with oil or grease Bicycle chain
• Coat with layers of paint Car body
• Galvanize with zinc Nail
• Alloy with other metals Stainless steel
cutlery
• Electroplate with another metal Jewellery
• Use sacrificial protection Ship’s hull
air water
Salt
• Coat with plastic Mesh fence