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1. Presence of ionic substances

2. Presence of acidic pollutants

3. Higher temperature

4. Scratching or bending the surface

5. Attachment to a less reactive metal

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Experiment to show oxygen and water are essential conditions for rusting

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Tube A:
add anhydrous calcium chloride
-absorbs moisture in air
-only has oxygen and has NO water
NO RUSTING
Tube B:
boiled distilled water
-to drive away the dissolved oxygen
layer of oil on surface
- stop oxygen from dissolving in water        again
NO RUSTING
Tube C:
iron nail is in contact with both oxygen and water
RUSTING OCCURS

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Chemical name:
hydrated iron(III) oxide
Fe₂O₃·xH₂O

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- process of the corrosion of iron

rusting of copper
rusting of aluminium

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called rusting.
Rust is the reddish-brown crust.

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reaction of metals with oxygen and moisture in air

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                                                                               What is Corrosion 

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                                                                               What is Corrosion 