Investigating conditions that are needed for the rust to form? CLASS 7 Activity

Three test tubes represents :

Test tube-1 : Iron nail + tap water

Test tube-2 : Iron nail + Calcium chloride , mouth of test tube was closed with a cork

Test tube -3 : Iron nail + tap water and a layer of oil , mouth of test tube was closed with a cork

Learners will be able to conclude about the conditions necessary for the rusting to occur (oxygen and water)