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SCIPAD - BIG IDEAS - BOOK 2
BASIS OF CHEMICAL REACTIONS
Corrosion
When metals are exposed to the environment they can deteriorate, or break down. Scientists call
this process corrosion. Rusting is the term used to describe the corrosion of iron or steel.
Investigating Rusting
Aim:		 To investigate the factors that cause rusting in iron.
Equipment: Four test tubes, test tube rack, a bung, four iron nails, boiled water, tap water, salty
water, cooking oil, calcium chloride.
Method: 1. Label four test tubes A - D and place in a test tube rack.
2. Test tube contents: A
=
Iron nail and tap water.
			 B
=
Iron nail and salty water.
			 C
=
Iron nail, boiled water, oil.
			 D
=
Iron nail and calcium chloride. Sealed with a bung.
3. Leave the test tubes undisturbed for at least three days.
A B C D
Observations: Complete the table.
Test tube Conditions present or absent Observations
A
B Salt, water and air.
C
D
Conclusion: Write a conclusion based on your findings. Outline what conditions cause the
fastest rate of rusting, and what conditions cause the slowest rate of rusting.





Calcium chloride
is an irritant.
Make sure the water
covers the whole nail.
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