Identify the type of changes and give reasons: i) Magnetizing an iron nail ii) Rusting of a nail. iii) Whisking of an egg. iv) Lighting an electric bulb.
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Answer:
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Answer:
Magnetizing an iron nail- chemical change
Rusting of a nail- chemical change
Whisking of an egg.- physical change
Lighting an electric bulb. - physical change
Explanation:
Magnetizing an iron nail A chemical change is the result of a change in the atomic structure of an atom - a gain or loss of electrons. Magnetization simply aligns the existing iron atoms in a certain way due the effect of a magnetic field on their dipole characteristics.
rusting produces new substance called rust or Ironoxide
Whisking of an egg. When you cook an egg, breaking bonds within, you have made a chemical change. You cannot reverse this process. Physical changes rearrange molecules, but do not change internal structure. When you whip egg whites, you have rearranged the molecules with the air being forced into the egg white
Lighting an electric bulb. -When electricity is passed through the bulb (tungsten ) the electrons in the atoms get excited and release the energy as light in terms of photons. So no chemical reaction is taking place. It is physical reaction.