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Question

List ten changes of occurring around you .classify them into physical and chemical changes .

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Solution

Examples of Chemical Changes

A new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds.


Burning wood
  • Souring milk
  • Mixing acid and base
  • Digesting food
  • Cooking an egg
  • Heating sugar to form caramel
  • Baking a cake
  • Rusting of iron
Examples of Physical Changes

No new chemical species forms in a physical change. Changing the state of a pure substance between solid, liquid, and gas phases of matter are all physical changes since the identity of the matter does not change.

  • Crumpling a sheet of aluminum foil
  • Melting an ice cube
  • Casting silver in a mold
  • Breaking a bottle
  • Boiling water
  • Evaporating alcohol
  • Shredding paper
  • Sublimation of dry ice into carbon dioxide vapor

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