1. Find out which substances are essential for rusting to occur.
2. Find out how the rusting process can be inhibited and how it can be promoted.
I predict that air (oxygen) and water are necessary for iron to rust. The nail in water with air will rust while the nails in dry air and in boiled water with no air will not. I also predict that galvanizing the nail with zinc and greasing the nail and painting the nail and electroplating the nail will inhibit rusting. I also predict that adding NaCl to the test tube with water and air will promote rusting of the iron nail.
Rusting is the chemical reaction between a metal and oxygen in the presence of water. In this case, it is the corrosion of iron. Corrosion is defined as the loss of metallic properties of a metal due to oxidation and it results in them losing strength and electrical conductivity. When iron is in contact with water and oxygen, it will rust.
Chemical equation of the rusting of iron: 4Fe+3O2+H20--> 2Fe2O3.H2O
There are certain things that will promote the rusting of iron. An example of this is adding NaCl (salt) to the water. When salt is dissolved in water, it is separated into Na+ and Cl- ions. These ions attach themselves separately to the charged parts of the water molecule (H20). When Na and Cl ions are present in water, there is an increase in the ability of the water to carry electrons as there are more ions in the water, therefore the iron will rust faster.
There are also many factors that will inhibit the rusting of iron. Examples of this are painting the iron, greasing the iron and electroplating the iron with copper and galvanizing the iron with zinc. Paint and grease are impermeable so oxygen and water cannot come into contact with the iron as the paint and grease would be in the way. Plating the iron (galvanizing) with zinc can inhibit the rusting process. Zinc corrodes more easily than iron does because it is higher in the reactivity... [continues]
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