State the differences between a physical change and a chemical change.
|Property||Physical change||Chemical Change|
|Formation of new substance||There are no new substan ces formed in a physical change.||New substances with different properties are formed in a chemical changes.|
|Nature of change||It is usually easy to reverse the process, thereby regaining 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.|
Concept: Concept of Physical Changes
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