Chemical change is the change in which the substance is transformed to form an another substance through chemical reactions. After the occurrence of this change, the substance cannot be changed into its original form. There is a change in the chemical properties, shape and other physical properties of the substance.
In the given situation, the cooking of an egg is the example of chemical change. There is a change in the smell, color and texture of the egg. The raw egg and the cooked egg vary in various aspects.