State the conditions under which the iron articles get rusted. Design an activity to investigate the conditions necessary for rusting.
State the conditions under which the iron articles get rusted. Design an activity to investigate the conditions necessary for rusting. Suggest any two methods to prevent rusting of iron.
1 Answers
Conditions are - air and moisture.
Activity: Take three test-tubes. Place clean iron nails in each test-tube.
(i) Pour some water in test-tube 1, cork it.
(ii) Pour water (boiled/distilled) in test-tube 2, add some oil and cork it.
(iii) Put some anhydrous calcium chloride in test-tube 3 and cork it.
(iv) After 2-3 days, we observe that the nails in test-tube 1 get rusted because they are exposed to air and water both, while nail in test-tube 2 and 3 do not get rusted. This shows rusting of iron takes place in the presence of air and moisture, both.
Methods to prevent rusting: Alloying, galvanization, painting, lubrication.