1. Aim: To investigate the factors that cause rusting in iron
2. Equipment: Four test tube, test tube racks, a bung, four iron nails,boiled water,tap water,salty water, cooking oil,calcium chloride.
3. 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.