Question

What is meant by 'rusting'? With labelled diagrams, describe an activity to find out the conditions under which iron rusts.

Answer 1

The slow eaten away of iron is called rusting.

EXPERIMENT:

I) take a piece of iron and keep it outside in the garden for 3-4weeks.

II) after 3-4weeks u see brownish thing called rust.

IT NEEDS MOIST AIR AND WATER VAPOUR TO RUST

Explanation:

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Answer 2

Explanation:

• Rusting is the method in which the iron and its alloys become corrosive such as steel.
• In damp air or water, when an iron object is left for some time, it will be covered with some red-black flaky substance and this is called as rust. The below experiments shows that rusting requires both water and air.
• Take three test tubes and drop clean nails in each of the test tubes.  
• When an iron object is left in damp air (or water) for a considerable time, it gets covered with a red-brown flaky substance called rust. This is called rusting of iron . Experiment to show that rusting of Iron requires both, air and water : We take three test-tubes and put one clean iron nail in each of the three test-tubes:
• 1. In the first test tube, add some any hydrous calcium chloride and close it. Water moisture is absorbed by the anhydrous calcium chloride from the damp air and makes it dry. By this way, as there is no water vapour in it, the iron nail will be kept dry in the first test tube.  
• 2. In the second test tube, add distilled boiling water that does not have any dissolved air. Put a layer of oil over the boiled water. By this way, the iron nail is kept in air free boiled water in the second test tube.  
• 3. In the third test tube, add unboiled water in such a way that two-thirds of nail goes inside the water. By this way, the iron nail is kept both in water and in air together.  
• After one week, we need to observe that iron nails in all three test tubes.  
• No rust is seen in the first and the second test tubes. Reddish brown rust is seen on the iron nail surface due to the presence of water and the air.
• This shows that the iron rusting takes place when there is water and air together.