Describe an activity to find the Conditions required for rusting.
Answers
Answer:
Take three test-tubes. Place clean iron nails in each test-tube.
Take three test-tubes. Place clean iron nails in each test-tube. • Pour some water in test-tube-1, cork it.
Take three test-tubes. Place clean iron nails in each test-tube. • Pour some water in test-tube-1, cork it. • Pour water (boiled/distilled) in test-tube-2, add some oil and cork it.
Take three test-tubes. Place clean iron nails in each test-tube. • Pour some water in test-tube-1, cork it. • Pour water (boiled/distilled) in test-tube-2, add some oil and cork it.• Put some anhydrous calcium chloride in test-tube-3 and cork it.
Take three test-tubes. Place clean iron nails in each test-tube. • Pour some water in test-tube-1, cork it. • Pour water (boiled/distilled) in test-tube-2, add some oil and cork it.• Put some anhydrous calcium chloride in test-tube-3 and cork it.• After 2-3 days we observe that the nails in test-tube 1 rust because they are exposed to air and water both, while nail in test-tube 2 and 3 do not rust. This shows rusting of iron takes place in the presence of air and moisture both.
Explanation:
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2.Label these test tubes A, B and C. Pour some water in test tube A and cork it.
3.Pour boiled distilled water in test tube B, add about 1 mL of oil and cork it. The oil will float on water and prevent the air from dissolving in the water.
4.Put some anhydrous calcium chloride in test tube C and cork it. Anhydrous calcium chloride will absorb the moisture, if any, from the air. Leave these test tubes for a few days and then observe.
Observation:
Iron nails rust in test tube A, but they do not rust in test tubes B and C. In the test tube A, the nails are exposed to both air and water. In the test tube B, the nails are exposed to only water, and the nails in test tube C are exposed to dry air.
Conclusion:
Moist air and water are required for rusting to take place.
Methods for the prevention of rusting are:
1.Painting
2.Oiling/greasing
3.Galvanizing
4.Chrome painting
5.Anodizing
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