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State the differences between a physical change and a chemical change.

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Property Physical change Chemical change
Formation of new Substance There are no new substances formed in a physical change. New substance with different properties is formed in a chemical change.
Nature of change  It is usually easy to reverse the process, thereby retaining the original substance. It is usually irreversible.
Energy Generally, energy is neither absorbed nor evolved  Considerable heat energy is either absorbed or evolved when a chemical change takes place.
Mass There is no change in the mass of the substance after a physical change Mass of a substance changes after a chemical change.

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