Question

identify the physical and chemical changes from the following a)electrolysis b)burning of magnesium in air c)mixing of iron fillings and sulphur powder d)sublimation of camphor

Answer 1

1) Electrolysis involves Redox reactions and thus it is a chemical change.
2) Burning of magnesium in air involves formation of Magnesium Oxide . Therefore it is a chemical change.
3) Mixing does not involve reaction of both components. That is the they do not react with each other. Therefore it is a Physical change.
4)Sublimation is the process of change in solid to vapour phase. The chemical properties of substance remains unchanged. Therefore it is a physical process.