Corrosion experiment:

When metals are exposed to the environment they can deteriorate, or break down. Scientist call this process corrosion. Rust is the term used to describe the corrosion of iron. Iron is a relatively cheap metal so it is widely used in the industry.

Aim: To investigate the factors that cause rusting in iron.
Equipment: Six test tubes, test tube rack, a bung, six iron nails, boiled water, tap water, salty water, cooking oil, calcium chloride, Nail polish, Magnesium,

Method: 

1. Label the six test tubes from A - F and place in a test tube
2. Test tube contents:
A = Water + Iron nail

B = Salt water + Iron nail

C = Water + Oil + Iron nail
D = Nail polish + Water + Iron nail

E = Mg wrapped around iron nail + Water

F - Calcium chloride + Iron nail - sealed with a bung

3. Leave test tubes undisturbed for at least three days.

Observations -
Nail A = Corroded
Nail B = Corroded
Nail C = Didnt corrode
Nail D = The parts of the nail that wasn't covered by nail polish corroded
Nail E =  It didn't corrode except for the liquid
Nail F =  It didn't corrode

Conclusion:
Rusting on metals occurs when there is water & oxygen present, 5 out of 6 nails both had water and oxygen, and most of these nails ended up rusting. Most of our nails corroded because they all had access to oxygen and water.  When oxygen and water aren't present, the metal or nail doesn't rust, for example, nail F. Nail F had no oxygen because it was closed off with a bung, and no water was added into it, so Nail F was a success. Nail C was a success because the oil blocked the entrance for the oxygen so the oxygen couldn't get in. Nail D also didn't have access to water because it was coated with nail polish, that's why the parts that weren't covered in nail polish ended up corroding.

*Our nail with oil ended up corroding because somebody mixed the oil, but all the other group's nails with oil didnt