Corrosion: Investigating Rusting

Aim: To investigate the factors that cause in iron.
Equipment: Six 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-F and place in a test tube
2. Test tube contents: 

• A - Tap water
• B - Saltwater
• C - Water + oil
• D - Mg (magnesium) ribbon wrapped around it.
• E - Water, calcium chloride, bung
• F - Nail polish

      3. Leave the test tube undisturbed for at least three days.

Nail + Tapwater

Nail + Salt water

Nail + Water + Oil

Nail +  Water + Magnesium

Nail + Water + Calcium chloride + Bung

Nail + Water + Nail polish

Then, we left these nails for three days.

As we can see in the picture, the nail rusted with tap water.
H2O, Oxygen, and Chlorine were the factors why the nail rusted.

 These pictures show what happened to the nails. We observed that some of them rusted and some did not. (I added captions or explanations for each photo).

Because we left it for three days, the salt was probably already
dissolved. However, the nail rusted.
We can't see it clearly in the picture but it did rusted.
H2O, Oxygen, and Sodium chloride were the factors why the nail rusted

With this nail. We've added oil and water to see what could happen.
After three days, what happened was some of the oil formed a bubble
in the test tube and covered the top part of the nail, and because of  this,
the top part didn't corrode. But overall, for the whole body of the nail,
corrosion didn't occurred. However, on the other side of the test tube,
there was marks/stain of rusting.

With this nail, we ribbon wrapped around a small strip
of magnesium. What happened with this nail was, the top part
of the nail rusted but for the part that was covered with the
magnesium, there was no rusting. For instance, the magnesium
stopped the rusting.