what is meant by rusting ?
with labelled diagram describe an activity to find out the conditions under which iron rusts.
Answers
Answered by
138
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.
i hope you understand please mark me
-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.
i hope you understand please mark me
Answered by
52
Rusting is the process in which metals are eaten up gradually by the action of air, moisture and chemicals.
Activity-
1) Place two iron nails in test tube A with some white anhydrous calcium chloride solid. The top os test tube plugged with some cotton. Calcium chloride absorbs water vapours from the air and so the air is dry- water is not present.
2) Place two iron nails in a stoppered test tube B of boiled water with a layer of oil drop on the top of the water. The water was boiled for 15 minutes to drive off all the dissolved oxygen. The oil prevents from the air dissolving in the water.
3) Place two iron nails in test tube C containing some water.
4) Allow the test tubes to stand in a beaker for few days and examine rusting.
Result- Rusting occurs in two iron nails present in test tube C
Conclusion- water and oxygen are together needed for rusting.
Activity-
1) Place two iron nails in test tube A with some white anhydrous calcium chloride solid. The top os test tube plugged with some cotton. Calcium chloride absorbs water vapours from the air and so the air is dry- water is not present.
2) Place two iron nails in a stoppered test tube B of boiled water with a layer of oil drop on the top of the water. The water was boiled for 15 minutes to drive off all the dissolved oxygen. The oil prevents from the air dissolving in the water.
3) Place two iron nails in test tube C containing some water.
4) Allow the test tubes to stand in a beaker for few days and examine rusting.
Result- Rusting occurs in two iron nails present in test tube C
Conclusion- water and oxygen are together needed for rusting.
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