The document describes an experiment to determine the conditions required for iron rusting. Tubes containing iron samples were exposed to different combinations of air, water, and salt. Results showed rust only formed when samples had both air and water, and salt made rusting worse. Common ways to prevent rusting include coating metals with oil, paint, zinc, or alloys, electroplating with other metals, using sacrificial protection, or coating with plastic.

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