Question

Describe an activity to find out the conditions under which an iron rust?

Answer 1

Rusting of iron (Fe) is caused by the two essential conditions are. a)Presence of Oxygen.b)Presence of Water whose pH is in acidic range.

Answer 2

When iron is exposed to 

-moist air 

-acid ranged water for a long time 

it acquires a brownish coat. This is called rusting of iron.

Activity:

1. Take three test tubes and clean iron nails are placed in each of them.

2. label the test tubes A, B and C.

3. In the test tube A, some water is poured it is corked.

4. In test tube B, boiled distilled water is poured, and about 1 mL of oil is added. 

The oil will float on water and prevent the air from dissolving in the water.

5. An hydrous calcium chloride is poured in test tube C and corked. 

Anhydrous calcium chloride will absorb the moisture, if any, from the air.

6.leave these tubes for a few days.

Observations: 

Nails in test tube A acquire rust because of air and water. 

Nails in test tube B do not get rusted because air was prevented from reacting with iron. 

Nails in test tube C do not get rusted because of same reason.