Difference Between Physical Change and Chemical Change

Physical Change

Physical change is a change in matter that involves the substance going from one physical state to another. The reference to a physical state involves solids, liquids, and gases. When a substance undergoes a physical change it does not lose its original properties when changing from one phase to another.

Examples of Physical changes:

  • Ice cream melting involves a change from a solid to a liquid and the substances maintain the properties of water because the molecules never change.
  • Hot molten iron is a liquid and when left to cool will from solid steel and can take many forms.

Chemical Change

Chemical change is a process where one or more substances are altered into one or more new and different substances. Thus, Chemical change is a chemical reaction involving the rearrangement of atoms. When a chemical change occurs, there is also a change in the energy of the system. A chemical change that gives off heat is called an exothermic reaction. One that absorbs heat is called an endothermic reaction.

Examples of Chemical Changes:

  • Boiling an eggs.
  • Burning a candle.
  • The process of digesting food.

physical change

Difference Between Physical Change and Chemical Change

Comparison

Physical Change

Chemical Change

Meaning It refers to a change in which the molecules are rearranged but their internal composition remains same. Chemical Change is a process in which the substance transforms into a new substance, having different chemical composition.
Reversibility t is easily reversible i.e original substance can be recovered. Chemical change is irreversible i.e. original substance cannot be recovered.
Formation of new substance In rhis, no new substance is formed. A chemical change is always accompanied by one or more new substance.
Involves Change in physical properties of the substance, i.e. shape, size, color etc. Change in chemical properties and composition of the substance.
Product Formation No new product is formed. New product is formed.
Energy Absorption and evolution of energy do not take place. Absorption and evolution of energy take place, during reaction.