Water and cooking oil differ in odor and inflammability due to their distinct chemical compositions.
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A physical change involves a change in the physical state or appearance of a substance without altering its chemical composition, whereas a chemical change involves the formation of new substances with different chemical compositions.
Despite starting with the same materials, the properties of the products obtained by Groups I and II differ because Group I involves a physical change, while Group II involves a chemical change or reaction.
The gas obtained by Group II is hydrogen sulfide. It is a colorless gas with the smell of rotten eggs.
The combustion test for hydrogen involves burning the gas, which can be potentially hazardous due to its flammability. Therefore, it is not advisable to perform this test in a classroom setting.